diff --git a/CODE_GUIDELINES.md b/CODE_GUIDELINES.md
index 70e1596..439eee8 100644
--- a/CODE_GUIDELINES.md
+++ b/CODE_GUIDELINES.md
@@ -1264,6 +1264,8 @@ end
 
 ### 3.12 Internationalization: Gettext
 
+**German (de):** Use informal address (“duzen”). All user-facing German text should address the user as “du” (e.g. “Bitte versuche es erneut”, “Deine Einstellungen”), not “Sie”.
+
 **Define Translations:**
 
 ```elixir
diff --git a/lib/mv_web/live/group_live/show.ex b/lib/mv_web/live/group_live/show.ex
index 0251fb6..0c7e93e 100644
--- a/lib/mv_web/live/group_live/show.ex
+++ b/lib/mv_web/live/group_live/show.ex
@@ -17,10 +17,12 @@ defmodule MvWeb.GroupLive.Show do
 
   require Logger
 
+  import Ash.Expr
   import MvWeb.LiveHelpers, only: [current_actor: 1]
   import MvWeb.Authorization
 
   alias Mv.Membership
+  alias MvWeb.Helpers.MemberHelpers, as: MemberHelpers
 
   @impl true
   def mount(_params, _session, socket) do
@@ -29,6 +31,7 @@ defmodule MvWeb.GroupLive.Show do
      |> assign(:show_add_member_input, false)
      |> assign(:member_search_query, "")
      |> assign(:available_members, [])
+     |> assign(:add_member_candidates, [])
      |> assign(:selected_member_ids, [])
      |> assign(:selected_members, [])
      |> assign(:show_member_dropdown, false)
@@ -94,13 +97,21 @@ defmodule MvWeb.GroupLive.Show do
         </h1>
 
         <div class="flex gap-2">
-          <%= if can?(@current_user, :update, Mv.Membership.Group) do %>
-            <.button variant="primary" navigate={~p"/groups/#{@group.slug}/edit"}>
+          <%= if can?(@current_user, :update, @group) do %>
+            <.button
+              variant="primary"
+              navigate={~p"/groups/#{@group.slug}/edit"}
+              data-testid="group-show-edit-btn"
+            >
               {gettext("Edit")}
             </.button>
           <% end %>
-          <%= if can?(@current_user, :destroy, Mv.Membership.Group) do %>
-            <.button class="btn-error" phx-click="open_delete_modal">
+          <%= if can?(@current_user, :destroy, @group) do %>
+            <.button
+              class="btn-error"
+              phx-click="open_delete_modal"
+              data-testid="group-show-delete-btn"
+            >
               {gettext("Delete")}
             </.button>
           <% end %>
@@ -123,7 +134,7 @@ defmodule MvWeb.GroupLive.Show do
         <div>
           <h2 class="text-lg font-semibold mb-2">{gettext("Members")}</h2>
           <div class="border border-base-300 rounded-lg p-4 bg-base-100">
-            <p class="mb-4">
+            <p class="mb-4" data-testid="group-show-member-count">
               {ngettext(
                 "Total: %{count} member",
                 "Total: %{count} members",
@@ -132,7 +143,7 @@ defmodule MvWeb.GroupLive.Show do
               )}
             </p>
 
-            <%= if can?(@current_user, :update, Mv.Membership.Group) do %>
+            <%= if can?(@current_user, :update, @group) do %>
               <div class="mb-4">
                 <%= if assigns[:show_add_member_input] do %>
                   <div class="join w-full">
@@ -160,6 +171,7 @@ defmodule MvWeb.GroupLive.Show do
                           <input
                             type="text"
                             id="member-search-input"
+                            data-testid="group-show-member-search-input"
                             role="combobox"
                             phx-hook="ComboBox"
                             phx-focus="show_member_dropdown"
@@ -228,6 +240,7 @@ defmodule MvWeb.GroupLive.Show do
                       type="button"
                       class="btn btn-primary join-item"
                       phx-click="add_selected_members"
+                      data-testid="group-show-add-selected-members-btn"
                       disabled={Enum.empty?(@selected_member_ids)}
                       aria-label={gettext("Add members")}
                     >
@@ -255,15 +268,17 @@ defmodule MvWeb.GroupLive.Show do
             <% end %>
 
             <%= if Enum.empty?(@group.members || []) do %>
-              <p class="text-base-content/50 italic">{gettext("No members in this group")}</p>
+              <p class="text-base-content/50 italic" data-testid="group-show-no-members">
+                {gettext("No members in this group")}
+              </p>
             <% else %>
-              <div class="overflow-x-auto">
+              <div class="overflow-x-auto" data-testid="group-show-members-table">
                 <table class="table table-zebra">
                   <thead>
                     <tr>
                       <th>{gettext("Name")}</th>
                       <th>{gettext("Email")}</th>
-                      <%= if can?(@current_user, :update, Mv.Membership.Group) do %>
+                      <%= if can?(@current_user, :update, @group) do %>
                         <th class="w-0">{gettext("Actions")}</th>
                       <% end %>
                     </tr>
@@ -291,13 +306,14 @@ defmodule MvWeb.GroupLive.Show do
                             <span class="text-base-content/50 italic">—</span>
                           <% end %>
                         </td>
-                        <%= if can?(@current_user, :update, Mv.Membership.Group) do %>
+                        <%= if can?(@current_user, :update, @group) do %>
                           <td>
                             <button
                               type="button"
                               class="btn btn-ghost btn-sm text-error"
                               phx-click="remove_member"
                               phx-value-member_id={member.id}
+                              data-testid="group-show-remove-member"
                               aria-label={gettext("Remove member from group")}
                               data-tooltip={gettext("Remove")}
                             >
@@ -431,28 +447,31 @@ defmodule MvWeb.GroupLive.Show do
   # Add Member Events
   @impl true
   def handle_event("show_add_member_input", _params, socket) do
-    # Reload group to ensure we have the latest members list
-    actor = current_actor(socket)
-    group = socket.assigns.group
-    socket = reload_group(socket, group.slug, actor)
+    # Load candidate members once (single DB read). Search/focus then filter in memory (R2).
+    socket =
+      socket
+      |> assign(:show_add_member_input, true)
+      |> assign(:member_search_query, "")
+      |> assign(:selected_member_ids, [])
+      |> assign(:selected_members, [])
+      |> assign(:show_member_dropdown, false)
+      |> assign(:focused_member_index, nil)
+      |> load_add_member_candidates()
 
-    {:noreply,
-     socket
-     |> assign(:show_add_member_input, true)
-     |> assign(:member_search_query, "")
-     |> assign(:available_members, [])
-     |> assign(:selected_member_ids, [])
-     |> assign(:selected_members, [])
-     |> assign(:show_member_dropdown, false)
-     |> assign(:focused_member_index, nil)}
+    {:noreply, socket}
   end
 
   @impl true
   def handle_event("show_member_dropdown", _params, socket) do
-    # Use existing group.members for filtering; reload only on add/remove
+    # Filter in memory from preloaded candidates; no DB read (R2).
+    query = socket.assigns.member_search_query || ""
+
     socket =
       socket
-      |> load_available_members("")
+      |> assign(
+        :available_members,
+        filter_candidates_in_memory(socket.assigns.add_member_candidates, query)
+      )
       |> assign(:show_member_dropdown, true)
       |> assign(:focused_member_index, nil)
 
@@ -466,6 +485,7 @@ defmodule MvWeb.GroupLive.Show do
      |> assign(:show_add_member_input, false)
      |> assign(:member_search_query, "")
      |> assign(:available_members, [])
+     |> assign(:add_member_candidates, [])
      |> assign(:selected_member_ids, [])
      |> assign(:selected_members, [])
      |> assign(:show_member_dropdown, false)
@@ -532,11 +552,13 @@ defmodule MvWeb.GroupLive.Show do
 
   @impl true
   def handle_event("search_members", %{"member_search" => query}, socket) do
-    # Use existing group.members for filtering; reload only on add/remove
+    # Filter in memory from preloaded candidates; no DB read (R2).
+    candidates = socket.assigns.add_member_candidates || []
+
     socket =
       socket
       |> assign(:member_search_query, query)
-      |> load_available_members(query)
+      |> assign(:available_members, filter_candidates_in_memory(candidates, query))
       |> assign(:show_member_dropdown, true)
       |> assign(:focused_member_index, nil)
 
@@ -660,47 +682,69 @@ defmodule MvWeb.GroupLive.Show do
     end
   end
 
-  defp load_available_members(socket, query) do
+  # Load candidate members once when opening add-member UI (single DB read).
+  defp load_add_member_candidates(socket) do
     require Ash.Query
 
-    current_member_ids = group_member_ids_set(socket.assigns.group)
-    base_query = available_members_base_query(query)
-
-    # Fetch more than 10, then exclude already-in-group and take 10 (avoids empty dropdown when first N are all in group)
-    fetch_limit = 50
-    limited_query = Ash.Query.limit(base_query, fetch_limit)
+    group = socket.assigns.group
+    exclude_ids = group_member_ids_set(group) |> MapSet.to_list()
     actor = current_actor(socket)
 
-    case Ash.read(limited_query, actor: actor, domain: Mv.Membership) do
-      {:ok, members} ->
-        available =
-          members
-          |> Enum.reject(fn m -> MapSet.member?(current_member_ids, m.id) end)
-          |> Enum.take(10)
+    if exclude_ids == [] do
+      # No members in group; load first N members
+      query =
+        Mv.Membership.Member
+        |> Ash.Query.sort([:last_name, :first_name])
+        |> Ash.Query.limit(300)
 
-        assign(socket, available_members: available)
+      do_load_add_member_candidates(socket, query, actor)
+    else
+      query =
+        Mv.Membership.Member
+        |> Ash.Query.filter(expr(id not in ^exclude_ids))
+        |> Ash.Query.sort([:last_name, :first_name])
+        |> Ash.Query.limit(300)
+
+      do_load_add_member_candidates(socket, query, actor)
+    end
+  end
+
+  defp do_load_add_member_candidates(socket, query, actor) do
+    case Ash.read(query, actor: actor, domain: Mv.Membership) do
+      {:ok, candidates} ->
+        socket
+        |> assign(:add_member_candidates, candidates)
+        |> assign(:available_members, Enum.take(candidates, 10))
 
       {:error, error} ->
-        Logger.warning("Failed to load available members for group: #{inspect(error)}")
+        Logger.warning("Failed to load add-member candidates: #{inspect(error)}")
 
         socket
-        |> put_flash(:error, gettext("Could not load member search. Please try again."))
+        |> put_flash(:error, gettext("Could not load member list. Please try again."))
+        |> assign(:add_member_candidates, [])
         |> assign(:available_members, [])
     end
   end
 
-  defp available_members_base_query(query) do
-    search_query = if query && String.trim(query) != "", do: String.trim(query), else: nil
+  # Filter preloaded candidates by query string (name/email). No DB read. R2.
+  defp filter_candidates_in_memory(candidates, query) when is_list(candidates) do
+    q = if is_binary(query), do: String.trim(query) |> String.downcase(), else: ""
 
-    if search_query do
-      Mv.Membership.Member
-      |> Ash.Query.for_read(:search, %{query: search_query})
+    if q == "" do
+      candidates |> Enum.take(10)
     else
-      Mv.Membership.Member
-      |> Ash.Query.new()
+      candidates
+      |> Enum.filter(fn m ->
+        name = MemberHelpers.display_name(m) |> String.downcase()
+        email = (m.email || "") |> String.downcase()
+        String.contains?(name, q) or String.contains?(email, q)
+      end)
+      |> Enum.take(10)
     end
   end
 
+  defp filter_candidates_in_memory(_, _), do: []
+
   defp group_member_ids_set(group) do
     members = group.members || []
     members |> Enum.map(& &1.id) |> MapSet.new()
@@ -740,6 +784,7 @@ defmodule MvWeb.GroupLive.Show do
      |> assign(:show_add_member_input, false)
      |> assign(:member_search_query, "")
      |> assign(:available_members, [])
+     |> assign(:add_member_candidates, [])
      |> assign(:selected_member_ids, [])
      |> assign(:selected_members, [])
      |> assign(:show_member_dropdown, false)
diff --git a/priv/gettext/de/LC_MESSAGES/default.po b/priv/gettext/de/LC_MESSAGES/default.po
index 0d661cf..0caac5c 100644
--- a/priv/gettext/de/LC_MESSAGES/default.po
+++ b/priv/gettext/de/LC_MESSAGES/default.po
@@ -2264,11 +2264,6 @@ msgstr "Nicht berechtigt."
 msgid "Could not load data fields. Please check your permissions."
 msgstr "Datenfelder konnten nicht geladen werden. Bitte überprüfe deine Berechtigungen."
 
-#: lib/mv_web/live/group_live/show.ex
-#, elixir-autogen, elixir-format
-msgid "Could not load member search. Please try again."
-msgstr "Mitgliedersuche konnte nicht geladen werden. Bitte versuchen Sie es erneut."
-
 #: lib/mv_web/live/group_live/show.ex
 #, elixir-autogen, elixir-format
 msgid "Add Member"
@@ -2609,17 +2604,7 @@ msgstr "Import"
 msgid "Value type cannot be changed after creation"
 msgstr "Der Wertetyp kann nach dem Erstellen nicht mehr geändert werden."
 
-#~ #: lib/mv_web/live/import_export_live.ex
-#~ #, elixir-autogen, elixir-format, fuzzy
-#~ msgid "Export Members (CSV)"
-#~ msgstr "Mitglieder exportieren (CSV)"
-
-#~ #: lib/mv_web/live/import_export_live.ex
-#~ #, elixir-autogen, elixir-format
-#~ msgid "Export functionality will be available in a future release."
-#~ msgstr "Export-Funktionalität ist im nächsten release verfügbar."
-
-#~ #: lib/mv_web/live/import_export_live.ex
-#~ #, elixir-autogen, elixir-format
-#~ msgid "Import members from CSV files or export member data."
-#~ msgstr "Importiere Mitglieder aus CSV-Dateien oder exportiere Mitgliederdaten."
+#: lib/mv_web/live/group_live/show.ex
+#, elixir-autogen, elixir-format, fuzzy
+msgid "Could not load member list. Please try again."
+msgstr "Mitgliederliste konnte nicht geladen werden. Bitte versuche es erneut."
diff --git a/priv/gettext/default.pot b/priv/gettext/default.pot
index 0aef1b3..a72caff 100644
--- a/priv/gettext/default.pot
+++ b/priv/gettext/default.pot
@@ -2265,11 +2265,6 @@ msgstr ""
 msgid "Could not load data fields. Please check your permissions."
 msgstr ""
 
-#: lib/mv_web/live/group_live/show.ex
-#, elixir-autogen, elixir-format
-msgid "Could not load member search. Please try again."
-msgstr ""
-
 #: lib/mv_web/live/group_live/show.ex
 #, elixir-autogen, elixir-format
 msgid "Add Member"
@@ -2609,3 +2604,8 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Value type cannot be changed after creation"
 msgstr ""
+
+#: lib/mv_web/live/group_live/show.ex
+#, elixir-autogen, elixir-format
+msgid "Could not load member list. Please try again."
+msgstr ""
diff --git a/priv/gettext/en/LC_MESSAGES/default.po b/priv/gettext/en/LC_MESSAGES/default.po
index 371a028..b8c1bf3 100644
--- a/priv/gettext/en/LC_MESSAGES/default.po
+++ b/priv/gettext/en/LC_MESSAGES/default.po
@@ -2265,11 +2265,6 @@ msgstr ""
 msgid "Could not load data fields. Please check your permissions."
 msgstr ""
 
-#: lib/mv_web/live/group_live/show.ex
-#, elixir-autogen, elixir-format
-msgid "Could not load member search. Please try again."
-msgstr ""
-
 #: lib/mv_web/live/group_live/show.ex
 #, elixir-autogen, elixir-format, fuzzy
 msgid "Add Member"
@@ -2610,17 +2605,7 @@ msgstr ""
 msgid "Value type cannot be changed after creation"
 msgstr ""
 
-#~ #: lib/mv_web/live/import_export_live.ex
-#~ #, elixir-autogen, elixir-format, fuzzy
-#~ msgid "Export Members (CSV)"
-#~ msgstr ""
-
-#~ #: lib/mv_web/live/import_export_live.ex
-#~ #, elixir-autogen, elixir-format
-#~ msgid "Export functionality will be available in a future release."
-#~ msgstr ""
-
-#~ #: lib/mv_web/live/import_export_live.ex
-#~ #, elixir-autogen, elixir-format
-#~ msgid "Import members from CSV files or export member data."
-#~ msgstr ""
+#: lib/mv_web/live/group_live/show.ex
+#, elixir-autogen, elixir-format, fuzzy
+msgid "Could not load member list. Please try again."
+msgstr ""
diff --git a/priv/repo/seeds.exs b/priv/repo/seeds.exs
index e96ca6e..6468949 100644
--- a/priv/repo/seeds.exs
+++ b/priv/repo/seeds.exs
@@ -3,10 +3,10 @@
 #     mix run priv/repo/seeds.exs
 #
 
-alias Mv.Membership
 alias Mv.Accounts
-alias Mv.MembershipFees.MembershipFeeType
+alias Mv.Membership
 alias Mv.MembershipFees.CycleGenerator
+alias Mv.MembershipFees.MembershipFeeType
 
 require Ash.Query
 
@@ -579,6 +579,39 @@ Enum.with_index(linked_members)
   end
 end)
 
+# Create example groups (idempotent: create only if name does not exist)
+group_configs = [
+  %{name: "Vorstand", description: "Gremium Vorstand"},
+  %{name: "Trainer*innen", description: "Alle lizenzierten Trainer*innen"},
+  %{name: "Jugend", description: "Jugendbereich"},
+  %{name: "Newsletter", description: "Empfänger*innen Newsletter"}
+]
+
+existing_groups =
+  case Membership.list_groups(actor: admin_user_with_role) do
+    {:ok, list} -> list
+    {:error, _} -> []
+  end
+
+existing_names_lower = MapSet.new(existing_groups, &String.downcase(&1.name))
+
+seed_groups =
+  Enum.reduce(group_configs, %{}, fn config, acc ->
+    name = config.name
+
+    if MapSet.member?(existing_names_lower, String.downcase(name)) do
+      group = Enum.find(existing_groups, &(String.downcase(&1.name) == String.downcase(name)))
+      Map.put(acc, name, group)
+    else
+      group =
+        Membership.create_group!(%{name: name, description: config.description},
+          actor: admin_user_with_role
+        )
+
+      Map.put(acc, name, group)
+    end
+  end)
+
 # Create sample custom field values for some members
 all_members = Ash.read!(Membership.Member, actor: admin_user_with_role)
 all_custom_fields = Ash.read!(Membership.CustomField, actor: admin_user_with_role)
@@ -587,6 +620,35 @@ all_custom_fields = Ash.read!(Membership.CustomField, actor: admin_user_with_rol
 find_field = fn name -> Enum.find(all_custom_fields, &(&1.name == name)) end
 find_member = fn email -> Enum.find(all_members, &(&1.email == email)) end
 
+# Assign seed members to groups (idempotent: duplicate create_member_group is skipped)
+member_group_assignments = [
+  {"hans.mueller@example.de", ["Vorstand", "Newsletter"]},
+  {"greta.schmidt@example.de", ["Jugend", "Newsletter"]},
+  {"friedrich.wagner@example.de", ["Trainer*innen"]},
+  {"maria.weber@example.de", ["Newsletter"]},
+  {"thomas.klein@example.de", ["Newsletter"]}
+]
+
+Enum.each(member_group_assignments, fn {email, group_names} ->
+  member = find_member.(email)
+
+  if member do
+    Enum.each(group_names, fn group_name ->
+      group = seed_groups[group_name]
+
+      if group do
+        case Membership.create_member_group(
+               %{member_id: member.id, group_id: group.id},
+               actor: admin_user_with_role
+             ) do
+          {:ok, _} -> :ok
+          {:error, _} -> :ok
+        end
+      end
+    end)
+  end
+end)
+
 # Add custom field values for Hans Müller
 if hans = find_member.("hans.mueller@example.de") do
   [
@@ -731,6 +793,7 @@ IO.puts(
 )
 
 IO.puts("   - Sample members: Hans, Greta, Friedrich")
+IO.puts("   - Groups: Vorstand, Trainer*innen, Jugend, Newsletter (with members assigned)")
 
 IO.puts(
   "   - Additional users: hans.mueller@example.de, greta.schmidt@example.de, maria.weber@example.de, thomas.klein@example.de"
diff --git a/test/mv_web/live/group_live/form_test.exs b/test/mv_web/live/group_live/form_test.exs
index 9169dfe..8934e85 100644
--- a/test/mv_web/live/group_live/form_test.exs
+++ b/test/mv_web/live/group_live/form_test.exs
@@ -19,6 +19,7 @@ defmodule MvWeb.GroupLive.FormTest do
     test "form renders with empty fields", %{conn: conn} do
       {:ok, view, html} = live(conn, "/groups/new")
 
+      # OR-chain for i18n (Create Group / Gruppe erstellen)
       assert html =~ gettext("Create Group") or html =~ "create" or html =~ "Gruppe erstellen"
       assert has_element?(view, "form")
     end
@@ -65,6 +66,7 @@ defmodule MvWeb.GroupLive.FormTest do
         |> form("#group-form", group: form_data)
         |> render_submit()
 
+      # OR-chain for i18n (required/erforderlich) and validation message wording
       assert html =~ gettext("required") or html =~ "name" or html =~ "error" or
                html =~ "erforderlich"
     end
@@ -80,6 +82,7 @@ defmodule MvWeb.GroupLive.FormTest do
         |> form("#group-form", group: form_data)
         |> render_submit()
 
+      # OR-chain for i18n (length/Länge) and validation message
       assert html =~ "100" or html =~ "length" or html =~ "error" or html =~ "Länge"
     end
 
@@ -98,6 +101,7 @@ defmodule MvWeb.GroupLive.FormTest do
         |> form("#group-form", group: form_data)
         |> render_submit()
 
+      # OR-chain for i18n (length/Länge) and validation message
       assert html =~ "500" or html =~ "length" or html =~ "error" or html =~ "Länge"
     end
 
@@ -116,6 +120,7 @@ defmodule MvWeb.GroupLive.FormTest do
         |> render_submit()
 
       # Check for a validation error on the name field in a robust way
+      # OR-chain for i18n and validation message (already taken)
       assert html =~ "name" or html =~ gettext("has already been taken")
     end
 
@@ -131,6 +136,7 @@ defmodule MvWeb.GroupLive.FormTest do
         |> form("#group-form", group: form_data)
         |> render_submit()
 
+      # OR-chain for i18n (error/Fehler, invalid/ungültig)
       assert html =~ "error" or html =~ "invalid" or html =~ "Fehler" or html =~ "ungültig"
     end
   end
@@ -196,6 +202,7 @@ defmodule MvWeb.GroupLive.FormTest do
         |> form("#group-form", group: form_data)
         |> render_submit()
 
+      # OR-chain for i18n (already taken / bereits vergeben) and validation wording
       assert html =~ "already" or html =~ "taken" or html =~ "exists" or html =~ "error" or
                html =~ "bereits" or html =~ "vergeben"
     end
@@ -205,7 +212,7 @@ defmodule MvWeb.GroupLive.FormTest do
 
       {:ok, _view, html} = live(conn, "/groups/#{group.slug}/edit")
 
-      # Slug should not be in form (it's immutable)
+      # Slug should not be in form (it's immutable); regex for input element
       refute html =~ ~r/slug.*input/i or html =~ ~r/input.*slug/i
     end
   end
diff --git a/test/mv_web/live/group_live/index_test.exs b/test/mv_web/live/group_live/index_test.exs
index b972095..751b5c6 100644
--- a/test/mv_web/live/group_live/index_test.exs
+++ b/test/mv_web/live/group_live/index_test.exs
@@ -40,13 +40,14 @@ defmodule MvWeb.GroupLive.IndexTest do
 
       assert html =~ "Test Group"
       assert html =~ "Test description"
-      # Member count should be displayed (0 for empty group)
+      # OR-chain for i18n (Members/Mitglieder) and alternate copy for count
       assert html =~ "0" or html =~ gettext("Members") or html =~ "Mitglieder"
     end
 
     test "displays 'Create Group' button for admin users", %{conn: conn} do
       {:ok, _view, html} = live(conn, "/groups")
 
+      # OR-chain for i18n (Create Group / Gruppe erstellen) and alternate wording
       assert html =~ gettext("Create Group") or html =~ "create" or html =~ "new" or
                html =~ "Gruppe erstellen"
     end
@@ -54,7 +55,7 @@ defmodule MvWeb.GroupLive.IndexTest do
     test "displays empty state when no groups exist", %{conn: conn} do
       {:ok, _view, html} = live(conn, "/groups")
 
-      # Should show empty state or empty list message
+      # OR-chain for i18n (No groups / Keine Gruppen) and alternate empty state copy
       assert html =~ gettext("No groups") or html =~ "0" or html =~ "empty" or
                html =~ "Keine Gruppen"
     end
@@ -76,6 +77,7 @@ defmodule MvWeb.GroupLive.IndexTest do
 
       {:ok, _view, html} = live(conn, "/groups")
 
+      # Long description may be truncated in UI
       assert html =~ long_description or html =~ String.slice(long_description, 0, 100)
     end
   end
@@ -109,7 +111,7 @@ defmodule MvWeb.GroupLive.IndexTest do
       # Should be able to see groups
       assert html =~ gettext("Groups")
 
-      # Should NOT see create button
+      # Read-only must not see create button (OR for i18n)
       refute html =~ gettext("Create Group") or html =~ "create"
     end
   end
@@ -177,7 +179,7 @@ defmodule MvWeb.GroupLive.IndexTest do
       final_count = Agent.get(query_count_agent, & &1)
       :telemetry.detach(handler_id)
 
-      # Member count should be displayed (should be 2)
+      # OR-chain for i18n (Members/Mitglieder) and count display
       assert html =~ "2" or html =~ gettext("Members") or html =~ "Mitglieder"
 
       # Verify query count is reasonable (member count should be calculated efficiently)
diff --git a/test/mv_web/live/group_live/integration_test.exs b/test/mv_web/live/group_live/integration_test.exs
index a98de85..96e9031 100644
--- a/test/mv_web/live/group_live/integration_test.exs
+++ b/test/mv_web/live/group_live/integration_test.exs
@@ -62,7 +62,7 @@ defmodule MvWeb.GroupLive.IntegrationTest do
 
       assert html =~ "Updated Workflow Test Group"
       assert html =~ "Updated description"
-      # Slug should remain unchanged
+      # OR-chain: slug may appear as UUID or normalized slug in copy
       assert html =~ original_slug or html =~ "workflow-test-group"
     end
 
@@ -101,7 +101,7 @@ defmodule MvWeb.GroupLive.IntegrationTest do
       # View group via slug
       {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
 
-      # Member count should be 2
+      # OR-chain for i18n (Members/Mitglieder); member names may be first or last
       assert html =~ "2" or html =~ gettext("Members") or html =~ "Mitglieder"
       assert html =~ member1.first_name or html =~ member1.last_name
       assert html =~ member2.first_name or html =~ member2.last_name
diff --git a/test/mv_web/live/group_live/show_accessibility_test.exs b/test/mv_web/live/group_live/show_accessibility_test.exs
index 97ce469..fc63551 100644
--- a/test/mv_web/live/group_live/show_accessibility_test.exs
+++ b/test/mv_web/live/group_live/show_accessibility_test.exs
@@ -22,12 +22,13 @@ defmodule MvWeb.GroupLive.ShowAccessibilityTest do
       |> element("button", "Add Member")
       |> render_click()
 
-      html = render(view)
-
-      # Search input should have proper ARIA attributes
-      assert html =~ ~r/aria-label/ ||
-               html =~ ~r/aria-autocomplete/ ||
-               html =~ ~r/role=["']combobox["']/
+      # OR-chain: at least one of these ARIA/role attributes must be present
+      assert has_element?(view, "[data-testid=group-show-member-search-input][aria-label]") or
+               has_element?(
+                 view,
+                 "[data-testid=group-show-member-search-input][aria-autocomplete]"
+               ) or
+               has_element?(view, "[data-testid=group-show-member-search-input][role=combobox]")
     end
 
     test "search input has correct aria-label and aria-autocomplete attributes", %{conn: conn} do
@@ -35,16 +36,14 @@ defmodule MvWeb.GroupLive.ShowAccessibilityTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      html = render(view)
-
-      # Search input should have ARIA attributes
-      assert html =~ ~r/aria-label.*[Ss]earch.*member/ ||
-               html =~ ~r/aria-autocomplete=["']list["']/
+      assert has_element?(
+               view,
+               "[data-testid=group-show-member-search-input][aria-autocomplete=list]"
+             )
     end
 
     test "remove button has aria-label with tooltip text", %{conn: conn} do
@@ -67,11 +66,7 @@ defmodule MvWeb.GroupLive.ShowAccessibilityTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      html = render(view)
-
-      # Remove button should have aria-label
-      assert html =~ ~r/aria-label.*[Rr]emove/ ||
-               html =~ ~r/aria-label.*member/i
+      assert has_element?(view, "[data-testid=group-show-remove-member][aria-label]")
     end
 
     test "add button has correct aria-label", %{conn: conn} do
@@ -79,16 +74,11 @@ defmodule MvWeb.GroupLive.ShowAccessibilityTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      html = render(view)
-
-      # Add button should have aria-label
-      assert html =~ ~r/aria-label.*[Aa]dd/ ||
-               html =~ ~r/button.*[Aa]dd/
+      assert has_element?(view, "[data-testid=group-show-add-selected-members-btn][aria-label]")
     end
   end
 
@@ -100,16 +90,11 @@ defmodule MvWeb.GroupLive.ShowAccessibilityTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      html = render(view)
-
-      # Inline add member area should have focusable elements
-      assert html =~ ~r/input|button/ ||
-               html =~ "#member-search-input"
+      assert has_element?(view, "[data-testid=group-show-member-search-input]")
     end
 
     test "inline input can be closed", %{conn: conn} do
@@ -117,17 +102,11 @@ defmodule MvWeb.GroupLive.ShowAccessibilityTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      assert has_element?(view, "#member-search-input")
-
-      # Click Add Member button again to close (or add a member to close it)
-      # For now, we verify the input is visible when opened
-      html = render(view)
-      assert html =~ "#member-search-input" || has_element?(view, "#member-search-input")
+      assert has_element?(view, "[data-testid=group-show-member-search-input]")
     end
 
     test "enter/space activates buttons when focused", %{conn: conn} do
@@ -148,17 +127,14 @@ defmodule MvWeb.GroupLive.ShowAccessibilityTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      # Select member
       view
-      |> element("#member-search-input")
+      |> element("[data-testid=group-show-member-search-input]")
       |> render_focus()
 
-      # phx-change is on the form, so we need to trigger it via the form
       view
       |> element("form[phx-change='search_members']")
       |> render_change(%{"member_search" => "Bob"})
@@ -167,14 +143,11 @@ defmodule MvWeb.GroupLive.ShowAccessibilityTest do
       |> element("[data-member-id='#{member.id}']")
       |> render_click()
 
-      # Add button should be enabled and clickable
       view
-      |> element("button[phx-click='add_selected_members']")
+      |> element("[data-testid=group-show-add-selected-members-btn]")
       |> render_click()
 
-      # Should succeed (member should appear in list)
-      html = render(view)
-      assert html =~ "Bob"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Bob")
     end
 
     test "focus management: focus is set to input when opened", %{conn: conn} do
@@ -184,16 +157,11 @@ defmodule MvWeb.GroupLive.ShowAccessibilityTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      html = render(view)
-
-      # Input should be visible and focusable
-      assert html =~ "#member-search-input" ||
-               html =~ ~r/autofocus|tabindex/
+      assert has_element?(view, "[data-testid=group-show-member-search-input]")
     end
   end
 
@@ -203,16 +171,11 @@ defmodule MvWeb.GroupLive.ShowAccessibilityTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      html = render(view)
-
-      # Input should have aria-label
-      assert html =~ ~r/aria-label.*[Ss]earch.*member/ ||
-               html =~ ~r/aria-label/
+      assert has_element?(view, "[data-testid=group-show-member-search-input][aria-label]")
     end
 
     test "search results are properly announced", %{conn: conn} do
@@ -231,27 +194,20 @@ defmodule MvWeb.GroupLive.ShowAccessibilityTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      # Search
       view
-      |> element("#member-search-input")
+      |> element("[data-testid=group-show-member-search-input]")
       |> render_focus()
 
-      # phx-change is on the form, so we need to trigger it via the form
       view
       |> element("form[phx-change='search_members']")
       |> render_change(%{"member_search" => "Charlie"})
 
-      html = render(view)
-
-      # Search results should have proper ARIA attributes
-      assert html =~ ~r/role=["']listbox["']/ ||
-               html =~ ~r/role=["']option["']/ ||
-               html =~ "Charlie"
+      assert has_element?(view, "#member-dropdown[role=listbox]")
+      assert has_element?(view, "#member-dropdown", "Charlie")
     end
 
     test "flash messages are properly announced", %{conn: conn} do
@@ -270,16 +226,14 @@ defmodule MvWeb.GroupLive.ShowAccessibilityTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Add member
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
       view
-      |> element("#member-search-input")
+      |> element("[data-testid=group-show-member-search-input]")
       |> render_focus()
 
-      # phx-change is on the form, so we need to trigger it via the form
       view
       |> element("form[phx-change='search_members']")
       |> render_change(%{"member_search" => "David"})
@@ -289,13 +243,10 @@ defmodule MvWeb.GroupLive.ShowAccessibilityTest do
       |> render_click()
 
       view
-      |> element("button[phx-click='add_selected_members']")
+      |> element("[data-testid=group-show-add-selected-members-btn]")
       |> render_click()
 
-      html = render(view)
-
-      # Member should appear in list (no flash message)
-      assert html =~ "David"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "David")
     end
   end
 end
diff --git a/test/mv_web/live/group_live/show_add_member_test.exs b/test/mv_web/live/group_live/show_add_member_test.exs
index 783db9d..0e1af32 100644
--- a/test/mv_web/live/group_live/show_add_member_test.exs
+++ b/test/mv_web/live/group_live/show_add_member_test.exs
@@ -34,9 +34,8 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
       select_member(view, member)
       add_selected(view)
 
-      html = render(view)
-      assert html =~ "Alice"
-      assert html =~ "Johnson"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Alice")
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Johnson")
     end
 
     test "member is successfully added to group (verified in list)", %{conn: conn} do
@@ -55,16 +54,14 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input and add member
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
       view
-      |> element("#member-search-input")
+      |> element("[data-testid=group-show-member-search-input]")
       |> render_focus()
 
-      # phx-change is on the form, so we need to trigger it via the form
       view
       |> element("form[phx-change='search_members']")
       |> render_change(%{"member_search" => "Bob"})
@@ -74,14 +71,11 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
       |> render_click()
 
       view
-      |> element("button[phx-click='add_selected_members']")
+      |> element("[data-testid=group-show-add-selected-members-btn]")
       |> render_click()
 
-      html = render(view)
-
-      # Verify member appears in group list (no success flash message)
-      assert html =~ "Bob"
-      assert html =~ "Smith"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Bob")
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Smith")
     end
 
     test "group member list updates automatically after add", %{conn: conn} do
@@ -98,21 +92,18 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
           actor: system_actor
         )
 
-      {:ok, view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Initially member should NOT be in list
-      refute html =~ "Charlie"
+      refute has_element?(view, "[data-testid=group-show-members-table]", "Charlie")
 
-      # Add member
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
       view
-      |> element("#member-search-input")
+      |> element("[data-testid=group-show-member-search-input]")
       |> render_focus()
 
-      # phx-change is on the form, so we need to trigger it via the form
       view
       |> element("form[phx-change='search_members']")
       |> render_change(%{"member_search" => "Charlie"})
@@ -122,13 +113,11 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
       |> render_click()
 
       view
-      |> element("button[phx-click='add_selected_members']")
+      |> element("[data-testid=group-show-add-selected-members-btn]")
       |> render_click()
 
-      # Member should now appear in list
-      html = render(view)
-      assert html =~ "Charlie"
-      assert html =~ "Brown"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Charlie")
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Brown")
     end
 
     test "member count updates automatically after add", %{conn: conn} do
@@ -152,11 +141,11 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
 
       # Add member
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
       view
-      |> element("#member-search-input")
+      |> element("[data-testid=group-show-member-search-input]")
       |> render_focus()
 
       # phx-change is on the form, so we need to trigger it via the form
@@ -169,7 +158,7 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
       |> render_click()
 
       view
-      |> element("button[phx-click='add_selected_members']")
+      |> element("[data-testid=group-show-add-selected-members-btn]")
       |> render_click()
 
       # Count should have increased
@@ -196,14 +185,14 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
 
       # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      assert has_element?(view, "#member-search-input")
+      assert has_element?(view, "[data-testid=group-show-member-search-input]")
 
       # Add member
       view
-      |> element("#member-search-input")
+      |> element("[data-testid=group-show-member-search-input]")
       |> render_focus()
 
       # phx-change is on the form, so we need to trigger it via the form
@@ -216,11 +205,10 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
       |> render_click()
 
       view
-      |> element("button[phx-click='add_selected_members']")
+      |> element("[data-testid=group-show-add-selected-members-btn]")
       |> render_click()
 
-      # Inline input should be closed (Add Member button should be visible again)
-      refute has_element?(view, "#member-search-input")
+      refute has_element?(view, "[data-testid=group-show-member-search-input]")
     end
 
     test "Cancel button closes inline add member area without adding", %{conn: conn} do
@@ -229,7 +217,7 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
       open_add_member(view)
-      assert has_element?(view, "#member-search-input")
+      assert has_element?(view, "[data-testid=group-show-member-search-input]")
       assert has_element?(view, "button[phx-click='hide_add_member_input']")
 
       cancel_add_member(view)
@@ -263,7 +251,7 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
 
       # Try to add same member again
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
       # Member should not appear in search (filtered out)
@@ -281,12 +269,12 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
         |> render_click()
 
         view
-        |> element("button", "Add")
+        |> element("[data-testid=group-show-add-selected-members-btn]")
         |> render_click()
 
-        # Should show error
+        # OR-chain for i18n and alternate error wording (already in group / duplicate)
         html = render(view)
-        assert html =~ gettext("already in group") || html =~ ~r/already.*group|duplicate/i
+        assert html =~ gettext("already in group") or html =~ ~r/already.*group|duplicate/i
       end
     end
 
@@ -300,7 +288,7 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
 
       # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
       # Try to add with invalid member ID (if possible)
@@ -331,11 +319,10 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
 
       # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      # Inline input should be open
-      assert has_element?(view, "#member-search-input")
+      assert has_element?(view, "[data-testid=group-show-member-search-input]")
 
       # If error occurs, inline input should remain open
       # (Implementation will handle this)
@@ -348,11 +335,10 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
 
       # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      # Add button should be disabled
-      assert has_element?(view, "button[phx-click='add_selected_members'][disabled]")
+      assert has_element?(view, "[data-testid=group-show-add-selected-members-btn][disabled]")
     end
   end
 
@@ -375,11 +361,11 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
 
       # Add member to empty group
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
       view
-      |> element("#member-search-input")
+      |> element("[data-testid=group-show-member-search-input]")
       |> render_focus()
 
       # phx-change is on the form, so we need to trigger it via the form
@@ -392,12 +378,10 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
       |> render_click()
 
       view
-      |> element("button[phx-click='add_selected_members']")
+      |> element("[data-testid=group-show-add-selected-members-btn]")
       |> render_click()
 
-      # Member should be added
-      html = render(view)
-      assert html =~ "Henry"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Henry")
     end
 
     test "add works when member is already in other groups", %{conn: conn} do
@@ -424,11 +408,11 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
 
       # Add same member to group2 (should work)
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
       view
-      |> element("#member-search-input")
+      |> element("[data-testid=group-show-member-search-input]")
       |> render_focus()
 
       # phx-change is on the form, so we need to trigger it via the form
@@ -441,12 +425,10 @@ defmodule MvWeb.GroupLive.ShowAddMemberTest do
       |> render_click()
 
       view
-      |> element("button[phx-click='add_selected_members']")
+      |> element("[data-testid=group-show-add-selected-members-btn]")
       |> render_click()
 
-      # Member should be added to group2
-      html = render(view)
-      assert html =~ "Isabel"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Isabel")
     end
   end
 
diff --git a/test/mv_web/live/group_live/show_add_remove_members_test.exs b/test/mv_web/live/group_live/show_add_remove_members_test.exs
index c014372..047205d 100644
--- a/test/mv_web/live/group_live/show_add_remove_members_test.exs
+++ b/test/mv_web/live/group_live/show_add_remove_members_test.exs
@@ -22,18 +22,18 @@ defmodule MvWeb.GroupLive.ShowAddRemoveMembersTest do
     test "Add Member button is visible for users with :update permission", %{conn: conn} do
       group = Fixtures.group_fixture()
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      assert html =~ gettext("Add Member") or html =~ "Add Member"
+      assert has_element?(view, "button[phx-click='show_add_member_input']")
     end
 
     @tag role: :read_only
     test "Add Member button is NOT visible for users without :update permission", %{conn: conn} do
       group = Fixtures.group_fixture()
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      refute html =~ gettext("Add Member")
+      refute has_element?(view, "button[phx-click='show_add_member_input']")
     end
 
     test "Add Member button is positioned above member table", %{conn: conn} do
@@ -61,11 +61,7 @@ defmodule MvWeb.GroupLive.ShowAddRemoveMembersTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Remove button should exist (can be icon button with trash icon)
-      html = render(view)
-
-      assert html =~ "Remove" or html =~ "remove" or html =~ "trash" or
-               html =~ ~r/hero-trash|hero-x-mark/
+      assert has_element?(view, "[data-testid=group-show-remove-member]")
     end
 
     @tag role: :read_only
@@ -78,10 +74,9 @@ defmodule MvWeb.GroupLive.ShowAddRemoveMembersTest do
         actor: system_actor
       )
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Remove button should NOT exist (check for trash icon or remove button specifically)
-      refute html =~ "hero-trash" or html =~ ~r/<button[^>]*remove_member/
+      refute has_element?(view, "[data-testid=group-show-remove-member]")
     end
   end
 
@@ -110,10 +105,7 @@ defmodule MvWeb.GroupLive.ShowAddRemoveMembersTest do
       |> element("button", gettext("Add Member"))
       |> render_click()
 
-      html = render(view)
-
-      assert html =~ gettext("Search for a member...") ||
-               html =~ ~r/search.*member/i
+      assert has_element?(view, "[data-testid=group-show-member-search-input]")
     end
 
     test "Add button (plus icon) is disabled until member selected", %{conn: conn} do
@@ -121,15 +113,11 @@ defmodule MvWeb.GroupLive.ShowAddRemoveMembersTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", gettext("Add Member"))
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      html = render(view)
-      # Add button should exist and be disabled initially
-      assert has_element?(view, "button[phx-click='add_selected_members'][disabled]") ||
-               html =~ ~r/disabled/
+      assert has_element?(view, "[data-testid=group-show-add-selected-members-btn][disabled]")
     end
   end
 end
diff --git a/test/mv_web/live/group_live/show_authorization_test.exs b/test/mv_web/live/group_live/show_authorization_test.exs
index f121b36..4bc2a49 100644
--- a/test/mv_web/live/group_live/show_authorization_test.exs
+++ b/test/mv_web/live/group_live/show_authorization_test.exs
@@ -52,8 +52,7 @@ defmodule MvWeb.GroupLive.ShowAuthorizationTest do
       |> render_click()
 
       # Should succeed (admin has :update permission, member should appear in list)
-      html = render(view)
-      assert html =~ "Alice"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Alice")
     end
 
     @tag role: :read_only
@@ -78,9 +77,7 @@ defmodule MvWeb.GroupLive.ShowAuthorizationTest do
       # Note: If button is hidden, we can't click it, but we test the event handler
       # by trying to send the event directly if possible
 
-      # For now, we verify that the button is not visible
-      html = render(view)
-      refute html =~ "Add Member"
+      refute has_element?(view, "button[phx-click='show_add_member_input']")
     end
 
     test "remove member event handler checks :update permission", %{conn: conn} do
@@ -103,14 +100,11 @@ defmodule MvWeb.GroupLive.ShowAuthorizationTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Remove member (should succeed for admin)
       view
-      |> element("button[phx-click='remove_member'][phx-value-member_id='#{member.id}']")
+      |> element("[data-testid=group-show-remove-member][phx-value-member_id='#{member.id}']")
       |> render_click()
 
-      # Should succeed (member should no longer be in list)
-      html = render(view)
-      refute html =~ "Charlie"
+      refute has_element?(view, "[data-testid=group-show-members-table]", "Charlie")
     end
 
     @tag role: :read_only
@@ -134,11 +128,7 @@ defmodule MvWeb.GroupLive.ShowAuthorizationTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Remove button should not be visible
-      html = render(view)
-
-      # Read-only user should NOT see Remove button (check for trash icon or remove button specifically)
-      refute html =~ "hero-trash" or html =~ ~r/<button[^>]*remove_member/
+      refute has_element?(view, "[data-testid=group-show-remove-member]")
     end
 
     test "error flash message on unauthorized access", %{conn: conn} do
@@ -174,10 +164,10 @@ defmodule MvWeb.GroupLive.ShowAuthorizationTest do
         actor: system_actor
       )
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Admin should see buttons
-      assert html =~ "Add Member" || html =~ "Remove"
+      assert has_element?(view, "button[phx-click='show_add_member_input']")
+      assert has_element?(view, "[data-testid=group-show-remove-member]")
     end
 
     @tag role: :read_only
@@ -185,10 +175,9 @@ defmodule MvWeb.GroupLive.ShowAuthorizationTest do
       _system_actor = Mv.Helpers.SystemActor.get_system_actor()
       group = Fixtures.group_fixture()
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Read-only user should NOT see Add Member button
-      refute html =~ "Add Member"
+      refute has_element?(view, "button[phx-click='show_add_member_input']")
     end
 
     @tag role: :read_only
@@ -210,21 +199,18 @@ defmodule MvWeb.GroupLive.ShowAuthorizationTest do
         actor: system_actor
       )
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Read-only user should NOT see Remove button (check for trash icon or remove button specifically)
-      refute html =~ "hero-trash" or html =~ ~r/<button[^>]*remove_member/
+      refute has_element?(view, "[data-testid=group-show-remove-member]")
     end
 
     @tag role: :read_only
     test "inline add member area cannot be opened for unauthorized users", %{conn: conn} do
       group = Fixtures.group_fixture()
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Inline input should not be accessible (button hidden)
-      refute html =~ "Add Member"
-      refute html =~ "#member-search-input"
+      refute has_element?(view, "button[phx-click='show_add_member_input']")
     end
   end
 
diff --git a/test/mv_web/live/group_live/show_integration_test.exs b/test/mv_web/live/group_live/show_integration_test.exs
index 0a82be8..13f8e5d 100644
--- a/test/mv_web/live/group_live/show_integration_test.exs
+++ b/test/mv_web/live/group_live/show_integration_test.exs
@@ -305,9 +305,8 @@ defmodule MvWeb.GroupLive.ShowIntegrationTest do
       |> render_click()
 
       # Both members should be in list
-      html = render(view)
-      assert html =~ "Frank"
-      assert html =~ "Grace"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Frank")
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Grace")
     end
 
     test "multiple members can be removed sequentially", %{conn: conn} do
@@ -343,11 +342,11 @@ defmodule MvWeb.GroupLive.ShowIntegrationTest do
         actor: system_actor
       )
 
-      {:ok, view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
       # Both should be in list initially
-      assert html =~ "Henry"
-      assert html =~ "Isabel"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Henry")
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Isabel")
 
       # Remove first member
       view
@@ -360,9 +359,8 @@ defmodule MvWeb.GroupLive.ShowIntegrationTest do
       |> render_click()
 
       # Both should be removed
-      html = render(view)
-      refute html =~ "Henry"
-      refute html =~ "Isabel"
+      refute has_element?(view, "[data-testid=group-show-members-table]", "Henry")
+      refute has_element?(view, "[data-testid=group-show-members-table]", "Isabel")
     end
 
     test "add and remove can be mixed", %{conn: conn} do
@@ -424,9 +422,8 @@ defmodule MvWeb.GroupLive.ShowIntegrationTest do
       |> render_click()
 
       # Only member2 should remain
-      html = render(view)
-      refute html =~ "Jack"
-      assert html =~ "Kate"
+      refute has_element?(view, "[data-testid=group-show-members-table]", "Jack")
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Kate")
     end
   end
 end
diff --git a/test/mv_web/live/group_live/show_member_search_test.exs b/test/mv_web/live/group_live/show_member_search_test.exs
index 75d1803..ed8a55d 100644
--- a/test/mv_web/live/group_live/show_member_search_test.exs
+++ b/test/mv_web/live/group_live/show_member_search_test.exs
@@ -34,21 +34,16 @@ defmodule MvWeb.GroupLive.ShowMemberSearchTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      # Type exact name
-      # phx-change is on the form, so we need to trigger it via the form
       view
       |> element("form[phx-change='search_members']")
       |> render_change(%{"member_search" => "Jonathan"})
 
-      html = render(view)
-
-      assert html =~ "Jonathan"
-      assert html =~ "Smith"
+      assert has_element?(view, "#member-dropdown", "Jonathan")
+      assert has_element?(view, "#member-dropdown", "Smith")
     end
 
     test "search finds member by partial name (fuzzy)", %{conn: conn} do
@@ -68,22 +63,16 @@ defmodule MvWeb.GroupLive.ShowMemberSearchTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      # Type partial name
-      # phx-change is on the form, so we need to trigger it via the form
       view
       |> element("form[phx-change='search_members']")
       |> render_change(%{"member_search" => "Jon"})
 
-      html = render(view)
-
-      # Fuzzy search should find Jonathan
-      assert html =~ "Jonathan"
-      assert html =~ "Smith"
+      assert has_element?(view, "#member-dropdown", "Jonathan")
+      assert has_element?(view, "#member-dropdown", "Smith")
     end
 
     test "search finds member by email", %{conn: conn} do
@@ -103,22 +92,17 @@ defmodule MvWeb.GroupLive.ShowMemberSearchTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      # Search by email
-      # phx-change is on the form, so we need to trigger it via the form
       view
       |> element("form[phx-change='search_members']")
       |> render_change(%{"member_search" => "alice.johnson"})
 
-      html = render(view)
-
-      assert html =~ "Alice"
-      assert html =~ "Johnson"
-      assert html =~ "alice.johnson@example.com"
+      assert has_element?(view, "#member-dropdown", "Alice")
+      assert has_element?(view, "#member-dropdown", "Johnson")
+      assert has_element?(view, "#member-dropdown", "alice.johnson@example.com")
     end
 
     test "dropdown shows member name and email", %{conn: conn} do
@@ -153,11 +137,9 @@ defmodule MvWeb.GroupLive.ShowMemberSearchTest do
       |> element("form[phx-change='search_members']")
       |> render_change(%{"member_search" => "Bob"})
 
-      html = render(view)
-
-      assert html =~ "Bob"
-      assert html =~ "Williams"
-      assert html =~ "bob@example.com"
+      assert has_element?(view, "#member-dropdown", "Bob")
+      assert has_element?(view, "#member-dropdown", "Williams")
+      assert has_element?(view, "#member-dropdown", "bob@example.com")
     end
 
     test "ComboBox hook works (focus opens dropdown)", %{conn: conn} do
@@ -177,20 +159,15 @@ defmodule MvWeb.GroupLive.ShowMemberSearchTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      # Focus input
       view
-      |> element("#member-search-input")
+      |> element("[data-testid=group-show-member-search-input]")
       |> render_focus()
 
-      html = render(view)
-
-      # Dropdown should be visible
-      assert html =~ ~r/role="listbox"/ || html =~ "listbox"
+      assert has_element?(view, "#member-dropdown[role=listbox]")
     end
   end
 
@@ -228,21 +205,16 @@ defmodule MvWeb.GroupLive.ShowMemberSearchTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      # Search for "David"
-      # phx-change is on the form, so we need to trigger it via the form
       view
       |> element("form[phx-change='search_members']")
       |> render_change(%{"member_search" => "David"})
 
-      # Assert only on dropdown (available members), not the members table
-      dropdown_html = view |> element("#member-dropdown") |> render()
-      assert dropdown_html =~ "Anderson"
-      refute dropdown_html =~ "Miller"
+      assert has_element?(view, "#member-dropdown", "Anderson")
+      refute has_element?(view, "#member-dropdown", "Miller")
     end
 
     test "search filters correctly when group has many members", %{conn: conn} do
@@ -280,23 +252,18 @@ defmodule MvWeb.GroupLive.ShowMemberSearchTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      # Search
-      # phx-change is on the form, so we need to trigger it via the form
       view
       |> element("form[phx-change='search_members']")
       |> render_change(%{"member_search" => "Available"})
 
-      # Assert only on dropdown (available members), not the members table
-      dropdown_html = view |> element("#member-dropdown") |> render()
-      assert dropdown_html =~ "Available"
-      assert dropdown_html =~ "Member"
-      refute dropdown_html =~ "Member1"
-      refute dropdown_html =~ "Member2"
+      assert has_element?(view, "#member-dropdown", "Available")
+      assert has_element?(view, "#member-dropdown", "Member")
+      refute has_element?(view, "#member-dropdown", "Member1")
+      refute has_element?(view, "#member-dropdown", "Member2")
     end
 
     test "search shows no results when all available members are already in group", %{conn: conn} do
@@ -321,18 +288,14 @@ defmodule MvWeb.GroupLive.ShowMemberSearchTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Open inline input
       view
-      |> element("button", "Add Member")
+      |> element("button[phx-click='show_add_member_input']")
       |> render_click()
 
-      # Search
-      # phx-change is on the form, so we need to trigger it via the form
       view
       |> element("form[phx-change='search_members']")
       |> render_change(%{"member_search" => "Only"})
 
-      # When no available members, dropdown is not rendered (length(@available_members) == 0)
       refute has_element?(view, "#member-dropdown")
     end
   end
diff --git a/test/mv_web/live/group_live/show_remove_member_test.exs b/test/mv_web/live/group_live/show_remove_member_test.exs
index d081b50..2b47941 100644
--- a/test/mv_web/live/group_live/show_remove_member_test.exs
+++ b/test/mv_web/live/group_live/show_remove_member_test.exs
@@ -31,19 +31,15 @@ defmodule MvWeb.GroupLive.ShowRemoveMemberTest do
         actor: system_actor
       )
 
-      {:ok, view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Member should be in list initially
-      assert html =~ "Alice"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Alice")
 
-      # Click Remove button
       view
-      |> element("button[phx-click='remove_member'][phx-value-member_id='#{member.id}']")
+      |> element("[data-testid=group-show-remove-member][phx-value-member_id='#{member.id}']")
       |> render_click()
 
-      # Member should no longer be in list (no success flash message)
-      html = render(view)
-      refute html =~ "Alice"
+      refute has_element?(view, "[data-testid=group-show-members-table]", "Alice")
     end
 
     test "member is successfully removed from group (verified in list)", %{conn: conn} do
@@ -64,20 +60,15 @@ defmodule MvWeb.GroupLive.ShowRemoveMemberTest do
         actor: system_actor
       )
 
-      {:ok, view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Member should be in list initially
-      assert html =~ "Bob"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Bob")
 
-      # Remove member
       view
-      |> element("button[phx-click='remove_member'][phx-value-member_id='#{member.id}']")
+      |> element("[data-testid=group-show-remove-member][phx-value-member_id='#{member.id}']")
       |> render_click()
 
-      html = render(view)
-
-      # Member should no longer be in list (no success flash message)
-      refute html =~ "Bob"
+      refute has_element?(view, "[data-testid=group-show-members-table]", "Bob")
     end
 
     test "group member list updates automatically after remove", %{conn: conn} do
@@ -98,19 +89,15 @@ defmodule MvWeb.GroupLive.ShowRemoveMemberTest do
         actor: system_actor
       )
 
-      {:ok, view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Member should be in list initially
-      assert html =~ "Charlie"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Charlie")
 
-      # Remove member
       view
-      |> element("button[phx-click='remove_member'][phx-value-member_id='#{member.id}']")
+      |> element("[data-testid=group-show-remove-member][phx-value-member_id='#{member.id}']")
       |> render_click()
 
-      # Member should no longer be in list
-      html = render(view)
-      refute html =~ "Charlie"
+      refute has_element?(view, "[data-testid=group-show-members-table]", "Charlie")
     end
 
     test "member count updates automatically after remove", %{conn: conn} do
@@ -158,7 +145,7 @@ defmodule MvWeb.GroupLive.ShowRemoveMemberTest do
       # Extract first member ID from the rendered HTML or use a different approach
       # Since we have member1 and member2, we can target member1 specifically
       view
-      |> element("button[phx-click='remove_member'][phx-value-member_id='#{member1.id}']")
+      |> element("[data-testid=group-show-remove-member][phx-value-member_id='#{member1.id}']")
       |> render_click()
 
       # Count should have decreased
@@ -187,17 +174,11 @@ defmodule MvWeb.GroupLive.ShowRemoveMemberTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Click Remove - should remove immediately without confirmation
       view
-      |> element("button[phx-click='remove_member'][phx-value-member_id='#{member.id}']")
+      |> element("[data-testid=group-show-remove-member][phx-value-member_id='#{member.id}']")
       |> render_click()
 
-      # No confirmation dialog should appear (immediate removal)
-      # This is verified by the member being removed without any dialog
-
-      # Member should be removed
-      html = render(view)
-      refute html =~ "Frank"
+      refute has_element?(view, "[data-testid=group-show-members-table]", "Frank")
     end
   end
 
@@ -220,23 +201,17 @@ defmodule MvWeb.GroupLive.ShowRemoveMemberTest do
         actor: system_actor
       )
 
-      {:ok, view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Member should be in list
-      assert html =~ "Grace"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Grace")
 
-      # Remove last member
       view
-      |> element("button[phx-click='remove_member'][phx-value-member_id='#{member.id}']")
+      |> element("[data-testid=group-show-remove-member][phx-value-member_id='#{member.id}']")
       |> render_click()
 
-      # Group should show empty state
+      assert has_element?(view, "[data-testid=group-show-no-members]")
+
       html = render(view)
-
-      assert html =~ gettext("No members in this group") ||
-               html =~ ~r/no.*members/i
-
-      # Count should be 0
       count = extract_member_count(html)
       assert count == 0
     end
@@ -269,18 +244,14 @@ defmodule MvWeb.GroupLive.ShowRemoveMemberTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group1.slug}")
 
-      # Remove from group1
       view
-      |> element("button[phx-click='remove_member'][phx-value-member_id='#{member.id}']")
+      |> element("[data-testid=group-show-remove-member][phx-value-member_id='#{member.id}']")
       |> render_click()
 
-      # Member should be removed from group1
-      html = render(view)
-      refute html =~ "Henry"
+      refute has_element?(view, "[data-testid=group-show-members-table]", "Henry")
 
-      # Verify member is still in group2
-      {:ok, _view2, html2} = live(conn, "/groups/#{group2.slug}")
-      assert html2 =~ "Henry"
+      {:ok, view2, _html2} = live(conn, "/groups/#{group2.slug}")
+      assert has_element?(view2, "[data-testid=group-show-members-table]", "Henry")
     end
 
     test "remove is idempotent (no error if member already removed)", %{conn: conn} do
@@ -303,22 +274,15 @@ defmodule MvWeb.GroupLive.ShowRemoveMemberTest do
 
       {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Remove member first time
       view
-      |> element("button[phx-click='remove_member'][phx-value-member_id='#{member.id}']")
+      |> element("[data-testid=group-show-remove-member][phx-value-member_id='#{member.id}']")
       |> render_click()
 
-      # Try to remove again (should not error, just be idempotent)
-      # Note: Implementation should handle this gracefully
-      # If button is still visible somehow, try to click again
-      html = render(view)
-
-      if html =~ "Isabel" do
+      if has_element?(view, "[data-testid=group-show-members-table]", "Isabel") do
         view
-        |> element("button[phx-click='remove_member'][phx-value-member_id='#{member.id}']")
+        |> element("[data-testid=group-show-remove-member][phx-value-member_id='#{member.id}']")
         |> render_click()
 
-        # Should not crash
         assert render(view)
       end
     end
diff --git a/test/mv_web/live/group_live/show_test.exs b/test/mv_web/live/group_live/show_test.exs
index bef234b..07a0c98 100644
--- a/test/mv_web/live/group_live/show_test.exs
+++ b/test/mv_web/live/group_live/show_test.exs
@@ -22,34 +22,33 @@ defmodule MvWeb.GroupLive.ShowTest do
     test "page renders successfully", %{conn: conn} do
       group = Fixtures.group_fixture()
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      assert html =~ group.name
+      assert has_element?(view, "h1", group.name)
     end
 
     test "displays group name", %{conn: conn} do
       group = Fixtures.group_fixture(%{name: "Test Group Name"})
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      assert html =~ "Test Group Name"
+      assert has_element?(view, "h1", "Test Group Name")
     end
 
     test "displays group description when present", %{conn: conn} do
       group = Fixtures.group_fixture(%{description: "This is a test description"})
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      assert html =~ "This is a test description"
+      assert has_element?(view, "p", "This is a test description")
     end
 
     test "displays member count", %{conn: conn} do
       group = Fixtures.group_fixture()
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Member count should be displayed (might be 0 or more)
-      assert html =~ "0" or html =~ gettext("Members") or html =~ "member" or html =~ "Mitglied"
+      assert has_element?(view, "[data-testid=group-show-member-count]")
     end
 
     test "displays list of members in group", %{conn: conn} do
@@ -67,26 +66,26 @@ defmodule MvWeb.GroupLive.ShowTest do
         actor: system_actor
       )
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      assert html =~ "Alice" or html =~ "Smith"
-      assert html =~ "Bob" or html =~ "Jones"
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Alice")
+      assert has_element?(view, "[data-testid=group-show-members-table]", "Bob")
     end
 
     test "displays edit button for admin users", %{conn: conn} do
       group = Fixtures.group_fixture()
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      assert html =~ gettext("Edit") or html =~ "edit" or html =~ "Bearbeiten"
+      assert has_element?(view, "[data-testid=group-show-edit-btn]")
     end
 
     test "displays delete button for admin users", %{conn: conn} do
       group = Fixtures.group_fixture()
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      assert html =~ gettext("Delete") or html =~ "delete" or html =~ "Löschen"
+      assert has_element?(view, "[data-testid=group-show-delete-btn]")
     end
   end
 
@@ -94,19 +93,17 @@ defmodule MvWeb.GroupLive.ShowTest do
     test "route /groups/:slug works correctly", %{conn: conn} do
       group = Fixtures.group_fixture(%{name: "Board Members"})
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      assert html =~ "Board Members"
-      # Verify slug is in URL
-      assert html =~ group.slug or html =~ "board-members"
+      assert has_element?(view, "h1", "Board Members")
     end
 
     test "group is found by slug via unique_slug identity", %{conn: conn} do
       group = Fixtures.group_fixture(%{name: "Test Group"})
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      assert html =~ group.name
+      assert has_element?(view, "h1", group.name)
     end
 
     test "non-existent slug returns 404", %{conn: conn} do
@@ -145,28 +142,26 @@ defmodule MvWeb.GroupLive.ShowTest do
     test "displays empty group correctly (0 members)", %{conn: conn} do
       group = Fixtures.group_fixture()
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      assert html =~ "0" or html =~ gettext("No members") or html =~ "empty" or
-               html =~ "Keine Mitglieder"
+      assert has_element?(view, "[data-testid=group-show-no-members]")
     end
 
     test "handles group without description correctly", %{conn: conn} do
       group = Fixtures.group_fixture(%{description: nil})
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      # Should not crash, description should be optional
-      assert html =~ group.name
+      assert has_element?(view, "h1", group.name)
     end
 
     test "handles slug with special characters correctly", %{conn: conn} do
       # Create group with name that generates slug with hyphens
       group = Fixtures.group_fixture(%{name: "Test-Group-Name"})
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      assert html =~ "Test-Group-Name" or html =~ group.name
+      assert has_element?(view, "h1", group.name)
     end
   end
 
@@ -177,11 +172,11 @@ defmodule MvWeb.GroupLive.ShowTest do
       read_only_user = Fixtures.user_with_role_fixture("read_only")
       conn = conn_with_password_user(conn, read_only_user)
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      assert html =~ group.name
-      # Should NOT see edit/delete buttons
-      refute html =~ gettext("Edit") or html =~ gettext("Delete")
+      assert has_element?(view, "h1", group.name)
+      refute has_element?(view, "[data-testid=group-show-edit-btn]")
+      refute has_element?(view, "[data-testid=group-show-delete-btn]")
     end
 
     @tag role: :unauthenticated
@@ -246,14 +241,14 @@ defmodule MvWeb.GroupLive.ShowTest do
       handler_id = "test-query-counter-#{System.unique_integer([:positive])}"
       :telemetry.attach(handler_id, [:ash, :query, :start], handler, nil)
 
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
       final_count = Agent.get(query_count_agent, & &1)
       :telemetry.detach(handler_id)
 
-      # All members should be displayed
       Enum.each(members, fn member ->
-        assert html =~ member.first_name or html =~ member.last_name
+        assert has_element?(view, "[data-testid=group-show-members-table]", member.first_name) or
+                 has_element?(view, "[data-testid=group-show-members-table]", member.last_name)
       end)
 
       # Verify query count is reasonable (should avoid N+1 queries)
@@ -267,10 +262,9 @@ defmodule MvWeb.GroupLive.ShowTest do
     test "slug lookup is efficient (uses unique_slug index)", %{conn: conn} do
       group = Fixtures.group_fixture()
 
-      # Should use index for fast lookup
-      {:ok, _view, html} = live(conn, "/groups/#{group.slug}")
+      {:ok, view, _html} = live(conn, "/groups/#{group.slug}")
 
-      assert html =~ group.name
+      assert has_element?(view, "h1", group.name)
     end
   end
 
diff --git a/test/support/group_live_helpers.ex b/test/support/group_live_helpers.ex
index 50e2f9e..d8f87b8 100644
--- a/test/support/group_live_helpers.ex
+++ b/test/support/group_live_helpers.ex
@@ -13,7 +13,7 @@ defmodule MvWeb.GroupLiveHelpers do
   """
   def open_add_member(view) do
     view
-    |> element("button", "Add Member")
+    |> element("button[phx-click='show_add_member_input']")
     |> render_click()
   end
 
@@ -22,7 +22,7 @@ defmodule MvWeb.GroupLiveHelpers do
   """
   def search_member(view, query) do
     view
-    |> element("#member-search-input")
+    |> element("[data-testid=group-show-member-search-input]")
     |> render_focus()
 
     view
@@ -44,7 +44,7 @@ defmodule MvWeb.GroupLiveHelpers do
   """
   def add_selected(view) do
     view
-    |> element("button[phx-click='add_selected_members']")
+    |> element("[data-testid=group-show-add-selected-members-btn]")
     |> render_click()
   end