Merge remote-tracking branch 'origin/main' into issue/mitgliederverwaltung-508

test/mv/membership/custom_field_value_formatter_test.exs

@@ -0,0 +1,27 @@
+defmodule Mv.Membership.CustomFieldValueFormatterTest do
+  use ExUnit.Case, async: true
+
+  alias Mv.Membership.CustomFieldValueFormatter
+
+  describe "format_custom_field_value/2 for :date" do
+    test "formats an Ash.Union date value as ISO-8601" do
+      union = %Ash.Union{value: ~D[2024-03-15], type: :date}
+
+      assert CustomFieldValueFormatter.format_custom_field_value(union, %{value_type: :date}) ==
+               "2024-03-15"
+    end
+
+    test "formats a direct Date value as ISO-8601" do
+      assert CustomFieldValueFormatter.format_custom_field_value(~D[2024-03-15], %{
+               value_type: :date
+             }) == "2024-03-15"
+    end
+
+    test "formats an already-stored ISO-8601 string date as ISO-8601" do
+      union = %Ash.Union{value: "2024-03-15", type: :date}
+
+      assert CustomFieldValueFormatter.format_custom_field_value(union, %{value_type: :date}) ==
+               "2024-03-15"
+    end
+  end
+end

test/mv/membership/import/column_resolver_query_test.exs

@@ -0,0 +1,72 @@
+defmodule Mv.Membership.Import.ColumnResolverQueryTest do
+  # async: false — attaches a global telemetry handler to inspect emitted SQL.
+  use Mv.DataCase, async: false
+
+  alias Mv.Membership.Import.ColumnResolver
+
+  setup do
+    %{actor: Mv.Helpers.SystemActor.get_system_actor()}
+  end
+
+  describe "create_or_find_group/3 group lookup is name-filtered (no full-table scan)" do
+    test "resolving a new name absent from the snapshot queries by name, not the whole table",
+         %{actor: actor} do
+      # Populate the table so a full-table read would be costly and observable.
+      for n <- 1..20, do: Mv.Fixtures.group_fixture(%{name: "Existing #{n}"})
+
+      queries =
+        capture_group_select_queries(fn ->
+          # The name is absent from the (empty) snapshot, forcing a DB lookup
+          # before the create attempt. That lookup must filter by name.
+          assert {:ok, group} = ColumnResolver.create_or_find_group("New One", [], actor)
+          assert group.name == "New One"
+        end)
+
+      # No SELECT against the groups table issued during resolution may be an
+      # unfiltered full-table scan. The pre-create existence check must filter by
+      # name (carry a WHERE predicate).
+      refute Enum.any?(queries, &unfiltered_groups_select?/1),
+             "expected no unfiltered groups table scan, got:\n#{Enum.join(queries, "\n")}"
+    end
+  end
+
+  defp capture_group_select_queries(fun) do
+    test_pid = self()
+    handler_id = "test-group-query-#{System.unique_integer([:positive])}"
+
+    :telemetry.attach(
+      handler_id,
+      [:mv, :repo, :query],
+      fn _event, _measurements, metadata, _config ->
+        sql = metadata[:query] || ""
+
+        if String.contains?(sql, "SELECT") and String.contains?(sql, "\"groups\"") do
+          send(test_pid, {:group_query, sql})
+        end
+      end,
+      nil
+    )
+
+    try do
+      fun.()
+    after
+      :telemetry.detach(handler_id)
+    end
+
+    collect_group_queries([])
+  end
+
+  defp collect_group_queries(acc) do
+    receive do
+      {:group_query, sql} -> collect_group_queries([sql | acc])
+    after
+      0 -> Enum.reverse(acc)
+    end
+  end
+
+  # An unfiltered groups SELECT reads the whole table: it selects FROM "groups"
+  # with no WHERE clause at all. A name-filtered lookup carries a WHERE predicate.
+  defp unfiltered_groups_select?(sql) do
+    String.contains?(sql, "FROM \"groups\"") and not String.contains?(sql, "WHERE")
+  end
+end

test/mv/membership/import/column_resolver_test.exs

@@ -0,0 +1,227 @@
+defmodule Mv.Membership.Import.ColumnResolverTest do
+  use Mv.DataCase, async: true
+  use ExUnitProperties
+
+  alias Mv.Membership.Import.ColumnResolver
+
+  setup do
+    %{actor: Mv.Helpers.SystemActor.get_system_actor()}
+  end
+
+  defp fee_type_fixture(name, actor) do
+    {:ok, fee_type} =
+      Mv.MembershipFees.create_membership_fee_type(
+        %{name: name, amount: Decimal.new("10.00"), interval: :yearly},
+        actor: actor
+      )
+
+    fee_type
+  end
+
+  defp header_maps(overrides) do
+    Map.merge(
+      %{
+        member: %{email: 0},
+        custom: %{},
+        unknown: [],
+        ignored: [],
+        groups_column_index: nil,
+        fee_type_column_index: nil
+      },
+      overrides
+    )
+  end
+
+  describe "resolve/3 group classification" do
+    test "splits group names into found (existing) and to_create (missing)", %{actor: actor} do
+      existing = Mv.Fixtures.group_fixture(%{name: "Orchester"})
+
+      maps = header_maps(%{member: %{email: 0}, groups_column_index: 1})
+
+      rows = [
+        {2, ["a@example.com", "Orchester"]},
+        {3, ["b@example.com", "Neues Ensemble"]}
+      ]
+
+      result = ColumnResolver.resolve(maps, rows, actor)
+
+      assert Enum.any?(result.groups_found, &(&1.name == "Orchester" and &1.id == existing.id))
+      assert "Neues Ensemble" in result.groups_to_create
+      refute "Orchester" in result.groups_to_create
+    end
+
+    test "groups_found and groups_to_create are empty when no groups column", %{actor: actor} do
+      maps = header_maps(%{})
+      rows = [{2, ["a@example.com"]}]
+
+      result = ColumnResolver.resolve(maps, rows, actor)
+
+      assert result.groups_found == []
+      assert result.groups_to_create == []
+    end
+  end
+
+  describe "resolve/3 preview rows" do
+    test "returns up to 3 preview rows", %{actor: actor} do
+      maps = header_maps(%{})
+
+      rows = [
+        {2, ["a@example.com"]},
+        {3, ["b@example.com"]},
+        {4, ["c@example.com"]},
+        {5, ["d@example.com"]}
+      ]
+
+      result = ColumnResolver.resolve(maps, rows, actor)
+
+      assert length(result.preview_rows) == 3
+      assert result.preview_rows == [["a@example.com"], ["b@example.com"], ["c@example.com"]]
+    end
+
+    test "returns fewer preview rows when file has fewer data rows", %{actor: actor} do
+      maps = header_maps(%{})
+      rows = [{2, ["a@example.com"]}]
+
+      result = ColumnResolver.resolve(maps, rows, actor)
+
+      assert result.preview_rows == [["a@example.com"]]
+    end
+  end
+
+  describe "resolve/3 fee-type resolution" do
+    test "maps known fee-type names to their id by normalized name", %{actor: actor} do
+      standard = fee_type_fixture("Standard", actor)
+
+      maps = header_maps(%{fee_type_column_index: 1})
+      rows = [{2, ["a@example.com", "Standard"]}]
+
+      result = ColumnResolver.resolve(maps, rows, actor)
+
+      assert result.fee_type_map["standard"] == standard.id
+      assert result.fee_type_warnings == []
+    end
+
+    test "records a warning for an unknown fee-type name", %{actor: actor} do
+      maps = header_maps(%{fee_type_column_index: 1})
+      rows = [{2, ["a@example.com", "Nonexistent Type"]}]
+
+      result = ColumnResolver.resolve(maps, rows, actor)
+
+      assert "Nonexistent Type" in result.fee_type_warnings
+    end
+
+    test "sets has_empty_fee_type_cells? when a fee-type cell is blank", %{actor: actor} do
+      fee_type_fixture("Standard", actor)
+
+      maps = header_maps(%{fee_type_column_index: 1})
+
+      rows = [
+        {2, ["a@example.com", "Standard"]},
+        {3, ["b@example.com", "  "]}
+      ]
+
+      result = ColumnResolver.resolve(maps, rows, actor)
+
+      assert result.has_empty_fee_type_cells? == true
+    end
+
+    test "has_empty_fee_type_cells? is false when all cells filled", %{actor: actor} do
+      fee_type_fixture("Standard", actor)
+
+      maps = header_maps(%{fee_type_column_index: 1})
+      rows = [{2, ["a@example.com", "Standard"]}]
+
+      result = ColumnResolver.resolve(maps, rows, actor)
+
+      assert result.has_empty_fee_type_cells? == false
+    end
+
+    test "fee-type resolution defaults are empty when no fee-type column", %{actor: actor} do
+      maps = header_maps(%{})
+      rows = [{2, ["a@example.com"]}]
+
+      result = ColumnResolver.resolve(maps, rows, actor)
+
+      assert result.fee_type_map == %{}
+      assert result.fee_type_warnings == []
+      assert result.has_empty_fee_type_cells? == false
+    end
+  end
+
+  describe "create_or_find_group/3" do
+    test "creates a new group when none exists", %{actor: actor} do
+      assert {:ok, group} = ColumnResolver.create_or_find_group("Brand New Group", [], actor)
+      assert group.name == "Brand New Group"
+    end
+
+    test "returns the existing group from the pre-fetched list without creating", %{actor: actor} do
+      existing = Mv.Fixtures.group_fixture(%{name: "Existing Group"})
+      before_count = length(Mv.Membership.list_groups!(actor: actor))
+
+      assert {:ok, group} =
+               ColumnResolver.create_or_find_group("Existing Group", [existing], actor)
+
+      assert group.id == existing.id
+      assert length(Mv.Membership.list_groups!(actor: actor)) == before_count
+    end
+
+    test "resolves to a group created concurrently after the snapshot was taken",
+         %{actor: actor} do
+      # Simulates a concurrent import session: the group name is absent from the
+      # caller's pre-fetched snapshot, but the group now exists in the DB. The
+      # resolver must link to the existing group, never error or duplicate it.
+      stale_snapshot = []
+      _concurrently_created = Mv.Fixtures.group_fixture(%{name: "Concurrent Group"})
+      before_count = length(Mv.Membership.list_groups!(actor: actor))
+
+      assert {:ok, group} =
+               ColumnResolver.create_or_find_group("Concurrent Group", stale_snapshot, actor)
+
+      assert group.name == "Concurrent Group"
+      assert length(Mv.Membership.list_groups!(actor: actor)) == before_count
+    end
+
+    property "is idempotent: same names never create duplicate groups", %{actor: actor} do
+      check all(
+              names <-
+                StreamData.list_of(
+                  StreamData.string(:alphanumeric, min_length: 1, max_length: 20),
+                  min_length: 1,
+                  max_length: 5
+                ),
+              max_runs: 25
+            ) do
+        names = Enum.map(names, &("grp-" <> &1))
+
+        existing = Mv.Membership.list_groups!(actor: actor)
+        first_ids = resolve_all(names, existing, actor)
+
+        existing_after = Mv.Membership.list_groups!(actor: actor)
+        second_ids = resolve_all(names, existing_after, actor)
+
+        # Same name always resolves to the same group id across both passes.
+        assert first_ids == second_ids
+
+        # No duplicate groups exist for any of the names (case-insensitive).
+        all_groups = Mv.Membership.list_groups!(actor: actor)
+
+        for name <- Enum.uniq_by(names, &String.downcase/1) do
+          matching =
+            Enum.filter(all_groups, fn g ->
+              String.downcase(g.name) == String.downcase(name)
+            end)
+
+          assert length(matching) == 1
+        end
+      end
+    end
+  end
+
+  defp resolve_all(names, existing, actor) do
+    Enum.map(names, fn name ->
+      {:ok, group} = ColumnResolver.create_or_find_group(name, existing, actor)
+      {String.downcase(name), group.id}
+    end)
+    |> Map.new()
+  end
+end

test/mv/membership/import/header_mapper_test.exs

@@ -1,5 +1,6 @@
 defmodule Mv.Membership.Import.HeaderMapperTest do
   use ExUnit.Case, async: true
+  use ExUnitProperties
 
   alias Mv.Membership.Import.HeaderMapper
 
@@ -272,4 +273,167 @@ defmodule Mv.Membership.Import.HeaderMapperTest do
       assert unknown == []
     end
   end
+
+  describe "build_maps/2 fee-status ignore list" do
+    test "places fee-status variants in ignored, not member or custom map" do
+      headers = ["email", "Bezahlstatus"]
+
+      assert {:ok, result} = HeaderMapper.build_maps(headers, [])
+
+      assert result.member[:email] == 0
+      assert result.custom == %{}
+      assert result.ignored == [1]
+      refute Map.has_key?(result.member, :bezahlstatus)
+    end
+
+    test "ignores membership_fee_status snake-case variant" do
+      headers = ["email", "membership_fee_status"]
+
+      assert {:ok, result} = HeaderMapper.build_maps(headers, [])
+
+      assert result.ignored == [1]
+      assert result.custom == %{}
+    end
+
+    test "ignores German Mitgliedsbeitragsstatus variant" do
+      headers = ["email", "Mitgliedsbeitragsstatus"]
+
+      assert {:ok, result} = HeaderMapper.build_maps(headers, [])
+
+      assert result.ignored == [1]
+    end
+
+    test "fee-status takes priority over a same-named custom field" do
+      headers = ["email", "Bezahlstatus"]
+      custom_fields = [%{id: "cf1", name: "Bezahlstatus"}]
+
+      assert {:ok, result} = HeaderMapper.build_maps(headers, custom_fields)
+
+      assert result.ignored == [1]
+      assert result.custom == %{}
+    end
+
+    test "result carries groups_column_index and fee_type_column_index keys" do
+      assert {:ok, result} = HeaderMapper.build_maps(["email"], [])
+
+      assert Map.has_key?(result, :groups_column_index)
+      assert Map.has_key?(result, :fee_type_column_index)
+    end
+  end
+
+  describe "build_maps/2 groups column detection" do
+    test "detects German Gruppen variant and excludes it from member/custom maps" do
+      headers = ["email", "Gruppen"]
+
+      assert {:ok, result} = HeaderMapper.build_maps(headers, [])
+
+      assert result.groups_column_index == 1
+      assert result.custom == %{}
+      assert result.unknown == []
+      refute Map.has_key?(result.member, :gruppen)
+    end
+
+    test "detects English Groups variant" do
+      headers = ["email", "Groups"]
+
+      assert {:ok, result} = HeaderMapper.build_maps(headers, [])
+
+      assert result.groups_column_index == 1
+    end
+
+    test "detects singular Gruppe and lowercase groups variants" do
+      assert {:ok, %{groups_column_index: 1}} = HeaderMapper.build_maps(["email", "Gruppe"], [])
+      assert {:ok, %{groups_column_index: 1}} = HeaderMapper.build_maps(["email", "groups"], [])
+    end
+
+    test "groups column takes priority over a same-named custom field" do
+      headers = ["email", "Gruppen"]
+      custom_fields = [%{id: "cf1", name: "Gruppen"}]
+
+      assert {:ok, result} = HeaderMapper.build_maps(headers, custom_fields)
+
+      assert result.groups_column_index == 1
+      assert result.custom == %{}
+    end
+
+    test "groups_column_index is nil when no groups column present" do
+      assert {:ok, %{groups_column_index: nil}} = HeaderMapper.build_maps(["email"], [])
+    end
+  end
+
+  describe "build_maps/2 fee-type column detection" do
+    test "detects German Beitragsart variant and excludes it from member/custom maps" do
+      headers = ["email", "Beitragsart"]
+
+      assert {:ok, result} = HeaderMapper.build_maps(headers, [])
+
+      assert result.fee_type_column_index == 1
+      assert result.custom == %{}
+      assert result.unknown == []
+    end
+
+    test "detects English fee type variants" do
+      assert {:ok, %{fee_type_column_index: 1}} =
+               HeaderMapper.build_maps(["email", "Fee Type"], [])
+
+      assert {:ok, %{fee_type_column_index: 1}} =
+               HeaderMapper.build_maps(["email", "fee type"], [])
+
+      assert {:ok, %{fee_type_column_index: 1}} =
+               HeaderMapper.build_maps(["email", "fee_type"], [])
+
+      assert {:ok, %{fee_type_column_index: 1}} =
+               HeaderMapper.build_maps(["email", "membership_fee_type"], [])
+    end
+
+    test "fee-type column takes priority over a same-named custom field" do
+      headers = ["email", "Beitragsart"]
+      custom_fields = [%{id: "cf1", name: "Beitragsart"}]
+
+      assert {:ok, result} = HeaderMapper.build_maps(headers, custom_fields)
+
+      assert result.fee_type_column_index == 1
+      assert result.custom == %{}
+    end
+
+    test "fee_type_column_index is nil when no fee-type column present" do
+      assert {:ok, %{fee_type_column_index: nil}} = HeaderMapper.build_maps(["email"], [])
+    end
+
+    test "detects groups and fee-type columns together" do
+      headers = ["email", "Gruppen", "Beitragsart"]
+
+      assert {:ok, result} = HeaderMapper.build_maps(headers, [])
+
+      assert result.groups_column_index == 1
+      assert result.fee_type_column_index == 2
+      assert result.member[:email] == 0
+      assert result.custom == %{}
+      assert result.unknown == []
+    end
+  end
+
+  describe "build_maps/2 fee-status ignore property" do
+    property "every fee-status variant is ignored, never member or custom" do
+      check all(
+              variant <-
+                StreamData.member_of([
+                  "Membership Fee Status",
+                  "membership_fee_status",
+                  "Mitgliedsbeitragsstatus",
+                  "Bezahlstatus",
+                  " Bezahlstatus ",
+                  "BEZAHLSTATUS"
+                ])
+            ) do
+        custom_fields = [%{id: "cf1", name: variant}]
+
+        assert {:ok, result} = HeaderMapper.build_maps(["email", variant], custom_fields)
+
+        assert result.ignored == [1]
+        assert result.custom == %{}
+        refute Map.has_key?(result.member, :bezahlstatus)
+      end
+    end
+  end
 end

test/mv/membership/import/import_runner_test.exs

@@ -3,6 +3,83 @@ defmodule Mv.Membership.Import.ImportRunnerTest do
 
   alias Mv.Membership.Import.ImportRunner
 
+  describe "carry_groups_forward/2" do
+    test "replaces import_state groups_found with the chunk's grown snapshot" do
+      import_state = %{groups_found: [%{id: "1", name: "A"}]}
+      chunk_result = %{groups_found: [%{id: "1", name: "A"}, %{id: "2", name: "B"}]}
+
+      assert ImportRunner.carry_groups_forward(import_state, chunk_result) == %{
+               groups_found: [%{id: "1", name: "A"}, %{id: "2", name: "B"}]
+             }
+    end
+
+    test "leaves import_state unchanged when the chunk result omits groups_found" do
+      import_state = %{groups_found: [%{id: "1", name: "A"}], other: :kept}
+      chunk_result = %{inserted: 1}
+
+      assert ImportRunner.carry_groups_forward(import_state, chunk_result) == import_state
+    end
+  end
+
+  describe "merge_progress/4 warning accumulation" do
+    test "deduplicates identical warnings across chunks instead of growing unbounded" do
+      progress = %{
+        inserted: 0,
+        failed: 0,
+        errors: [],
+        warnings: ["Fee type 'Ghost' not found; using the default fee type."],
+        status: :running,
+        current_chunk: 0,
+        total_chunks: 3
+      }
+
+      chunk_result = %{
+        inserted: 2,
+        failed: 0,
+        errors: [],
+        errors_truncated?: false,
+        warnings: [
+          "Fee type 'Ghost' not found; using the default fee type.",
+          "Fee type 'Ghost' not found; using the default fee type."
+        ]
+      }
+
+      result = ImportRunner.merge_progress(progress, chunk_result, 0)
+
+      assert result.warnings == ["Fee type 'Ghost' not found; using the default fee type."]
+    end
+
+    test "preserves distinct warnings while collapsing duplicates" do
+      progress = %{
+        inserted: 0,
+        failed: 0,
+        errors: [],
+        warnings: ["Fee type 'A' not found; using the default fee type."],
+        status: :running,
+        current_chunk: 0,
+        total_chunks: 2
+      }
+
+      chunk_result = %{
+        inserted: 1,
+        failed: 0,
+        errors: [],
+        errors_truncated?: false,
+        warnings: [
+          "Fee type 'A' not found; using the default fee type.",
+          "Fee type 'B' not found; using the default fee type."
+        ]
+      }
+
+      result = ImportRunner.merge_progress(progress, chunk_result, 0)
+
+      assert result.warnings == [
+               "Fee type 'A' not found; using the default fee type.",
+               "Fee type 'B' not found; using the default fee type."
+             ]
+    end
+  end
+
   describe "read_file_entry/2" do
     test "returns {:ok, content} for a readable file" do
       path =

test/mv/membership/import/member_csv_test.exs

@@ -1,5 +1,6 @@
 defmodule Mv.Membership.Import.MemberCSVTest do
   use Mv.DataCase, async: true
+  use ExUnitProperties
 
   alias Mv.Membership.Import.MemberCSV
 
@@ -899,4 +900,302 @@ defmodule Mv.Membership.Import.MemberCSVTest do
       assert import_state.chunks != []
     end
   end
+
+  describe "prepare/2 column resolution integration" do
+    setup do
+      %{actor: Mv.Helpers.SystemActor.get_system_actor()}
+    end
+
+    test "exposes resolver output keys in import_state", %{actor: actor} do
+      csv_content = "email\njohn@example.com"
+
+      assert {:ok, import_state} = MemberCSV.prepare(csv_content, actor: actor)
+
+      assert Map.has_key?(import_state, :ignored)
+      assert Map.has_key?(import_state, :groups_to_create)
+      assert Map.has_key?(import_state, :fee_type_map)
+      assert Map.has_key?(import_state, :fee_type_warnings)
+      assert Map.has_key?(import_state, :has_empty_fee_type_cells?)
+      assert Map.has_key?(import_state, :preview_rows)
+    end
+
+    test "fee-status column is reported as ignored, not as a custom field", %{actor: actor} do
+      {:ok, _custom_field} =
+        Mv.Membership.CustomField
+        |> Ash.Changeset.for_create(:create, %{name: "Bezahlstatus", value_type: :string})
+        |> Ash.create(actor: actor)
+
+      csv_content = "email;Bezahlstatus\njohn@example.com;paid"
+
+      assert {:ok, import_state} = MemberCSV.prepare(csv_content, actor: actor)
+
+      assert import_state.ignored == ["Bezahlstatus"]
+      assert import_state.custom_field_map == %{}
+    end
+
+    test "preview rows are limited to 3", %{actor: actor} do
+      csv_content = "email\na@example.com\nb@example.com\nc@example.com\nd@example.com"
+
+      assert {:ok, import_state} = MemberCSV.prepare(csv_content, actor: actor)
+
+      assert length(import_state.preview_rows) == 3
+    end
+  end
+
+  describe "process_chunk/4 fee-type assignment" do
+    setup do
+      actor = Mv.Helpers.SystemActor.get_system_actor()
+
+      {:ok, fee_type} =
+        Mv.MembershipFees.create_membership_fee_type(
+          %{name: "Premium", amount: Decimal.new("25.00"), interval: :yearly},
+          actor: actor
+        )
+
+      %{actor: actor, fee_type: fee_type}
+    end
+
+    test "sets membership_fee_type_id when fee-type cell matches a known type", %{
+      actor: actor,
+      fee_type: fee_type
+    } do
+      chunk = [
+        {2, %{member: %{email: "fee-known@example.com"}, custom: %{}, fee_type: "Premium"}}
+      ]
+
+      opts = [
+        actor: actor,
+        fee_type_map: %{"premium" => fee_type.id}
+      ]
+
+      assert {:ok, result} = MemberCSV.process_chunk(chunk, %{email: 0}, %{}, opts)
+      assert result.inserted == 1
+
+      member =
+        Mv.Membership.list_members!(actor: actor)
+        |> Enum.find(&(&1.email == "fee-known@example.com"))
+
+      assert member.membership_fee_type_id == fee_type.id
+    end
+
+    test "adds a warning when the fee-type name is unknown", %{actor: actor} do
+      chunk = [
+        {2, %{member: %{email: "fee-unknown@example.com"}, custom: %{}, fee_type: "Ghost Type"}}
+      ]
+
+      opts = [actor: actor, fee_type_map: %{}]
+
+      assert {:ok, result} = MemberCSV.process_chunk(chunk, %{email: 0}, %{}, opts)
+      assert result.inserted == 1
+      assert Enum.any?(result.warnings, &(&1 =~ "Ghost Type"))
+    end
+
+    test "uses the default fee type when the fee-type cell is empty", %{
+      actor: actor,
+      fee_type: fee_type
+    } do
+      {:ok, settings} = Mv.Membership.get_settings()
+
+      {:ok, _settings} =
+        Mv.Membership.update_settings(
+          settings,
+          %{default_membership_fee_type_id: fee_type.id},
+          actor: actor
+        )
+
+      chunk = [{2, %{member: %{email: "fee-empty@example.com"}, custom: %{}, fee_type: ""}}]
+
+      opts = [actor: actor, fee_type_map: %{}]
+
+      assert {:ok, result} = MemberCSV.process_chunk(chunk, %{email: 0}, %{}, opts)
+      assert result.inserted == 1
+
+      member =
+        Mv.Membership.list_members!(actor: actor)
+        |> Enum.find(&(&1.email == "fee-empty@example.com"))
+
+      # Default fee type assigned via SetDefaultMembershipFeeType.
+      assert member.membership_fee_type_id == fee_type.id
+    end
+  end
+
+  describe "process_chunk/4 group assignment" do
+    setup do
+      %{actor: Mv.Helpers.SystemActor.get_system_actor()}
+    end
+
+    defp group_names_for(email, actor) do
+      member =
+        Mv.Membership.list_members!(actor: actor)
+        |> Enum.find(&(&1.email == email))
+
+      member = Ash.load!(member, :groups, actor: actor)
+      member.groups |> Enum.map(& &1.name) |> Enum.sort()
+    end
+
+    test "assigns member to an existing group", %{actor: actor} do
+      existing = Mv.Fixtures.group_fixture(%{name: "Orchester"})
+
+      chunk = [
+        {2, %{member: %{email: "g-existing@example.com"}, custom: %{}, groups: "Orchester"}}
+      ]
+
+      opts = [actor: actor, groups_found: [existing]]
+
+      assert {:ok, result} = MemberCSV.process_chunk(chunk, %{email: 0}, %{}, opts)
+      assert result.inserted == 1
+
+      assert group_names_for("g-existing@example.com", actor) == ["Orchester"]
+
+      # No new group was created.
+      orchester = Enum.filter(Mv.Membership.list_groups!(actor: actor), &(&1.name == "Orchester"))
+      assert length(orchester) == 1
+    end
+
+    test "auto-creates an unknown group and assigns the member", %{actor: actor} do
+      chunk = [
+        {2, %{member: %{email: "g-new@example.com"}, custom: %{}, groups: "Frische Gruppe"}}
+      ]
+
+      opts = [actor: actor, groups_found: []]
+
+      assert {:ok, result} = MemberCSV.process_chunk(chunk, %{email: 0}, %{}, opts)
+      assert result.inserted == 1
+
+      assert group_names_for("g-new@example.com", actor) == ["Frische Gruppe"]
+      assert Enum.any?(Mv.Membership.list_groups!(actor: actor), &(&1.name == "Frische Gruppe"))
+    end
+
+    test "handles multiple comma-separated groups", %{actor: actor} do
+      chunk = [
+        {2, %{member: %{email: "g-multi@example.com"}, custom: %{}, groups: "Orchester, Chor"}}
+      ]
+
+      opts = [actor: actor, groups_found: []]
+
+      assert {:ok, result} = MemberCSV.process_chunk(chunk, %{email: 0}, %{}, opts)
+      assert result.inserted == 1
+
+      assert group_names_for("g-multi@example.com", actor) == ["Chor", "Orchester"]
+    end
+
+    test "does not re-read the group table once per row for a repeated novel name",
+         %{actor: actor} do
+      rows =
+        for i <- 1..10 do
+          {i + 1,
+           %{member: %{email: "g-nplus1-#{i}@example.com"}, custom: %{}, groups: "Shared Group"}}
+        end
+
+      group_read_count = Agent.start_link(fn -> 0 end) |> elem(1)
+      test_pid = self()
+
+      # process_chunk runs synchronously in this test process, so the telemetry
+      # handler (invoked in the query-executing process) sees self() == test_pid.
+      # Filtering on the pid keeps concurrent tests' group queries out of the count.
+      handler = fn _event, _measurements, metadata, _config ->
+        if self() == test_pid and metadata[:source] == "groups" and
+             is_binary(metadata[:query]) and String.starts_with?(metadata.query, "SELECT") do
+          Agent.update(group_read_count, &(&1 + 1))
+        end
+      end
+
+      handler_id = "test-group-read-counter-#{System.unique_integer([:positive])}"
+      :telemetry.attach(handler_id, [:mv, :repo, :query], handler, nil)
+
+      assert {:ok, %{inserted: 10}} =
+               MemberCSV.process_chunk(rows, %{email: 0}, %{}, actor: actor, groups_found: [])
+
+      reads = Agent.get(group_read_count, & &1)
+      :telemetry.detach(handler_id)
+
+      # The novel group is created on the first row and reused in memory for the
+      # remaining nine. Without accumulation each row triggers a fresh full-table
+      # read, scaling linearly with the row count.
+      assert reads <= 3,
+             "Expected the group table read at most a few times, got #{reads} reads for 10 rows (N+1)."
+    end
+
+    test "returns the grown group snapshot so later chunks skip the table read",
+         %{actor: actor} do
+      chunk1 = [
+        {2, %{member: %{email: "g-xchunk-1@example.com"}, custom: %{}, groups: "Shared X"}}
+      ]
+
+      chunk2 = [
+        {3, %{member: %{email: "g-xchunk-2@example.com"}, custom: %{}, groups: "Shared X"}}
+      ]
+
+      assert {:ok, result1} =
+               MemberCSV.process_chunk(chunk1, %{email: 0}, %{}, actor: actor, groups_found: [])
+
+      # The chunk result must expose the accumulated snapshot, including the group
+      # auto-created while processing this chunk, so the LiveView can thread it
+      # into the next chunk's opts.
+      assert is_list(result1.groups_found)
+      assert Enum.any?(result1.groups_found, &(&1.name == "Shared X"))
+
+      group_read_count = Agent.start_link(fn -> 0 end) |> elem(1)
+      test_pid = self()
+
+      handler = fn _event, _measurements, metadata, _config ->
+        if self() == test_pid and metadata[:source] == "groups" and
+             is_binary(metadata[:query]) and String.starts_with?(metadata.query, "SELECT") do
+          Agent.update(group_read_count, &(&1 + 1))
+        end
+      end
+
+      handler_id = "test-xchunk-group-read-#{System.unique_integer([:positive])}"
+      :telemetry.attach(handler_id, [:mv, :repo, :query], handler, nil)
+
+      assert {:ok, %{inserted: 1}} =
+               MemberCSV.process_chunk(chunk2, %{email: 0}, %{},
+                 actor: actor,
+                 groups_found: result1.groups_found
+               )
+
+      reads = Agent.get(group_read_count, & &1)
+      :telemetry.detach(handler_id)
+
+      # The second chunk receives the snapshot grown by the first, so the shared
+      # group resolves from memory without any full-table read.
+      assert reads == 0,
+             "Expected no group table read in the second chunk, got #{reads} (snapshot not threaded across chunks)."
+    end
+
+    test "empty groups cell leaves the member without group assignment", %{actor: actor} do
+      chunk = [{2, %{member: %{email: "g-empty@example.com"}, custom: %{}, groups: "  "}}]
+      opts = [actor: actor, groups_found: []]
+
+      assert {:ok, result} = MemberCSV.process_chunk(chunk, %{email: 0}, %{}, opts)
+      assert result.inserted == 1
+      assert result.errors == []
+
+      assert group_names_for("g-empty@example.com", actor) == []
+    end
+
+    property "re-importing the same groups does not create duplicates", %{actor: actor} do
+      check all(
+              name <- StreamData.string(:alphanumeric, min_length: 1, max_length: 15),
+              max_runs: 15
+            ) do
+        group_name = "dup-" <> name
+        email1 = "dup-#{System.unique_integer([:positive])}@example.com"
+        email2 = "dup-#{System.unique_integer([:positive])}@example.com"
+        opts = [actor: actor, groups_found: []]
+
+        chunk1 = [{2, %{member: %{email: email1}, custom: %{}, groups: group_name}}]
+        chunk2 = [{2, %{member: %{email: email2}, custom: %{}, groups: group_name}}]
+
+        assert {:ok, %{inserted: 1}} = MemberCSV.process_chunk(chunk1, %{email: 0}, %{}, opts)
+        assert {:ok, %{inserted: 1}} = MemberCSV.process_chunk(chunk2, %{email: 0}, %{}, opts)
+
+        matching =
+          Mv.Membership.list_groups!(actor: actor)
+          |> Enum.filter(&(String.downcase(&1.name) == String.downcase(group_name)))
+
+        assert length(matching) == 1
+      end
+    end
+  end
 end

test/mv_web/controllers/import_template_controller_test.exs

@@ -0,0 +1,104 @@
+defmodule MvWeb.ImportTemplateControllerTest do
+  use MvWeb.ConnCase, async: true
+
+  setup %{conn: conn} do
+    actor = Mv.Helpers.SystemActor.get_system_actor()
+
+    {:ok, custom_field} =
+      Mv.Membership.CustomField
+      |> Ash.Changeset.for_create(:create, %{name: "Lieblingsfarbe", value_type: :string})
+      |> Ash.create(actor: actor)
+
+    %{conn: conn, custom_field: custom_field}
+  end
+
+  describe "authenticated EN template" do
+    setup %{conn: conn} do
+      admin = Mv.Fixtures.user_with_role_fixture("admin")
+      %{conn: MvWeb.ConnCase.conn_with_password_user(conn, admin)}
+    end
+
+    test "returns CSV with English headers and current custom fields", %{conn: conn} do
+      conn = get(conn, ~p"/admin/import/template/en")
+
+      assert response_content_type(conn, :csv) =~ "text/csv"
+      body = response(conn, 200)
+
+      header = body |> String.split("\n") |> List.first()
+      assert header =~ "email"
+      # EN headers use the canonical English variant from HeaderMapper, not the
+      # underscore form, so the template stays faithful to the documented variant list.
+      assert header =~ "first name"
+      assert header =~ "last name"
+      refute header =~ "first_name"
+      assert header =~ "house number"
+      refute header =~ "house_number"
+      assert header =~ "Lieblingsfarbe"
+
+      assert get_resp_header(conn, "content-disposition")
+             |> Enum.any?(&(&1 =~ "member_import_en.csv"))
+    end
+
+    test "neutralizes formula-injection in a custom field header", %{conn: conn} do
+      actor = Mv.Helpers.SystemActor.get_system_actor()
+
+      {:ok, _} =
+        Mv.Membership.CustomField
+        |> Ash.Changeset.for_create(:create, %{
+          name: "=cmd|'/c calc'!A1",
+          value_type: :string
+        })
+        |> Ash.create(actor: actor)
+
+      conn = get(conn, ~p"/admin/import/template/en")
+      body = response(conn, 200)
+      header = body |> String.split("\n") |> List.first()
+
+      # The dangerous cell must be prefixed with a single quote so spreadsheet
+      # software does not evaluate it as a formula, matching the export writer.
+      refute header =~ ~r/(^|;)=cmd/
+      assert header =~ "'=cmd|'/c calc'!A1"
+    end
+  end
+
+  describe "authenticated DE template" do
+    setup %{conn: conn} do
+      admin = Mv.Fixtures.user_with_role_fixture("admin")
+      %{conn: MvWeb.ConnCase.conn_with_password_user(conn, admin)}
+    end
+
+    test "returns CSV with German headers and current custom fields", %{conn: conn} do
+      conn = get(conn, ~p"/admin/import/template/de")
+
+      body = response(conn, 200)
+      header = body |> String.split("\n") |> List.first()
+
+      assert header =~ "E-Mail"
+      assert header =~ "Vorname"
+      assert header =~ "Lieblingsfarbe"
+
+      assert get_resp_header(conn, "content-disposition")
+             |> Enum.any?(&(&1 =~ "member_import_de.csv"))
+    end
+  end
+
+  describe "authorization" do
+    @tag role: :unauthenticated
+    test "unauthenticated request does not receive a CSV", %{conn: conn} do
+      conn = get(conn, ~p"/admin/import/template/en")
+
+      refute conn.status == 200
+      refute get_resp_header(conn, "content-type") |> Enum.any?(&(&1 =~ "text/csv"))
+      refute to_string(conn.resp_body) =~ "email"
+    end
+
+    @tag role: :member
+    test "user without import permission is forbidden", %{conn: conn} do
+      conn = get(conn, ~p"/admin/import/template/en")
+
+      refute conn.status == 200
+      refute get_resp_header(conn, "content-type") |> Enum.any?(&(&1 =~ "text/csv"))
+      refute to_string(conn.resp_body) =~ "email"
+    end
+  end
+end

test/mv_web/live/import_live/components_test.exs

@@ -0,0 +1,31 @@
+defmodule MvWeb.ImportLive.ComponentsTest do
+  use ExUnit.Case, async: true
+
+  alias MvWeb.ImportLive.Components
+
+  describe "import_button_disabled?/2" do
+    @done_entry %{done?: true}
+
+    test "disables the Start Import button while the preview is displayed" do
+      # During :preview the upload entry is done, but re-clicking Start Import
+      # would re-run the upload processing and overwrite the current preview.
+      assert Components.import_button_disabled?(:preview, [@done_entry]) == true
+    end
+
+    test "disables the button while an import is running" do
+      assert Components.import_button_disabled?(:running, [@done_entry]) == true
+    end
+
+    test "disables the button when there are no upload entries" do
+      assert Components.import_button_disabled?(:idle, []) == true
+    end
+
+    test "disables the button while an upload entry is not yet done" do
+      assert Components.import_button_disabled?(:idle, [%{done?: false}]) == true
+    end
+
+    test "enables the button at idle with a completed upload" do
+      assert Components.import_button_disabled?(:idle, [@done_entry]) == false
+    end
+  end
+end

test/mv_web/live/import_live_test.exs

@@ -27,6 +27,16 @@ defmodule MvWeb.ImportLiveTest do
 
   defp submit_import(view), do: view |> form("#csv-upload-form", %{}) |> render_submit()
 
+  defp confirm_import(view),
+    do: view |> element("[data-testid='confirm-import-button']") |> render_click()
+
+  # Full flow: upload, enter preview (start), then confirm to begin processing.
+  defp run_full_import(view, csv_content, filename \\ "test_import.csv") do
+    upload_csv_file(view, csv_content, filename)
+    submit_import(view)
+    confirm_import(view)
+  end
+
   defp wait_for_import_completion, do: Process.sleep(1000)
 
   # ---------- Business logic: Authorization ----------
@@ -56,8 +66,7 @@ defmodule MvWeb.ImportLiveTest do
         |> File.read!()
 
       {:ok, view, _html} = live(conn, ~p"/admin/import")
-      upload_csv_file(view, csv_content)
-      submit_import(view)
+      run_full_import(view, csv_content)
       wait_for_import_completion()
 
       assert has_element?(view, "[data-testid='import-results-panel']")
@@ -121,8 +130,7 @@ defmodule MvWeb.ImportLiveTest do
       invalid_csv: csv_content
     } do
       {:ok, view, _html} = live(conn, ~p"/admin/import")
-      upload_csv_file(view, csv_content, "invalid_import.csv")
-      submit_import(view)
+      run_full_import(view, csv_content, "invalid_import.csv")
       wait_for_import_completion()
 
       assert has_element?(view, "[data-testid='import-results-panel']")
@@ -141,8 +149,7 @@ defmodule MvWeb.ImportLiveTest do
       invalid_rows =
         for i <- 1..100, do: "Row#{i};Last#{i};;Country#{i};City#{i};Street#{i};12345\n"
 
-      upload_csv_file(view, header <> Enum.join(invalid_rows), "large_invalid.csv")
-      submit_import(view)
+      run_full_import(view, header <> Enum.join(invalid_rows), "large_invalid.csv")
       wait_for_import_completion()
 
       assert has_element?(view, "[data-testid='import-results-panel']")
@@ -174,8 +181,7 @@ defmodule MvWeb.ImportLiveTest do
         Path.join([__DIR__, "..", "..", "fixtures", "csv_with_bom_semicolon.csv"])
         |> File.read!()
 
-      upload_csv_file(view, csv_content, "bom_import.csv")
-      submit_import(view)
+      run_full_import(view, csv_content, "bom_import.csv")
       wait_for_import_completion()
 
       assert has_element?(view, "[data-testid='import-results-panel']")
@@ -193,8 +199,7 @@ defmodule MvWeb.ImportLiveTest do
         Path.join([__DIR__, "..", "..", "fixtures", "csv_with_empty_lines.csv"])
         |> File.read!()
 
-      upload_csv_file(view, csv_content, "empty_lines.csv")
-      submit_import(view)
+      run_full_import(view, csv_content, "empty_lines.csv")
       wait_for_import_completion()
 
       assert has_element?(view, "[data-testid='import-error-list']")
@@ -208,8 +213,7 @@ defmodule MvWeb.ImportLiveTest do
       unknown_custom_field_csv: csv_content
     } do
       {:ok, view, _html} = live(conn, ~p"/admin/import")
-      upload_csv_file(view, csv_content, "unknown_custom.csv")
-      submit_import(view)
+      run_full_import(view, csv_content, "unknown_custom.csv")
       wait_for_import_completion()
 
       assert has_element?(view, "[data-testid='import-results-panel']")
@@ -240,23 +244,41 @@ defmodule MvWeb.ImportLiveTest do
       assert has_element?(view, "[data-testid='start-import-button']")
     end
 
-    test "template links and file input are present", %{conn: conn} do
+    test "template links point to the dynamic import template routes", %{conn: conn} do
+      {:ok, view, _html} = live(conn, ~p"/admin/import")
+      assert has_element?(view, "a[href='/admin/import/template/en']")
+      assert has_element?(view, "a[href='/admin/import/template/de']")
+      refute has_element?(view, "a[href*='/templates/member_import_en.csv']")
+    end
+
+    test "file input is present", %{conn: conn} do
       {:ok, view, _html} = live(conn, ~p"/admin/import")
-      assert has_element?(view, "a[href*='/templates/member_import_en.csv']")
-      assert has_element?(view, "a[href*='/templates/member_import_de.csv']")
       assert has_element?(view, "label[for='csv_file']")
       assert has_element?(view, "#csv_file_help")
       assert has_element?(view, "[data-testid='csv-upload-form'] input[type='file']")
     end
 
+    test "custom fields notice lists accepted groups and fee-type column names", %{conn: conn} do
+      {:ok, _view, html} = live(conn, ~p"/admin/import")
+
+      # Groups column variants (both EN and DE)
+      assert html =~ "Groups"
+      assert html =~ "Gruppen"
+      # Fee type column variants (both EN and DE)
+      assert html =~ "Beitragsart"
+      assert html =~ "Fee Type"
+      assert html =~ "fee type"
+      # Fee status is always ignored (named explicitly)
+      assert html =~ "Bezahlstatus"
+    end
+
     test "after successful import, progress container has aria-live", %{conn: conn} do
       csv_content =
         Path.join([__DIR__, "..", "..", "fixtures", "valid_member_import.csv"])
         |> File.read!()
 
       {:ok, view, _html} = live(conn, ~p"/admin/import")
-      upload_csv_file(view, csv_content)
-      submit_import(view)
+      run_full_import(view, csv_content)
       wait_for_import_completion()
       assert has_element?(view, "[data-testid='import-progress-container']")
       html = render(view)
@@ -275,4 +297,187 @@ defmodule MvWeb.ImportLiveTest do
     html = render(view)
     assert html =~ "Failed to prepare"
   end
+
+  describe "preview state machine" do
+    setup %{conn: conn} do
+      admin_user = Mv.Fixtures.user_with_role_fixture("admin")
+
+      conn =
+        conn
+        |> MvWeb.ConnCase.conn_with_password_user(admin_user)
+        |> put_locale_en()
+
+      valid_csv =
+        Path.join([__DIR__, "..", "..", "fixtures", "valid_member_import.csv"])
+        |> File.read!()
+
+      {:ok, conn: conn, valid_csv: valid_csv}
+    end
+
+    test "start_import transitions to preview without processing", %{
+      conn: conn,
+      valid_csv: csv_content
+    } do
+      {:ok, view, _html} = live(conn, ~p"/admin/import")
+      upload_csv_file(view, csv_content)
+      submit_import(view)
+
+      # Preview is shown; no results panel yet because nothing was processed.
+      assert has_element?(view, "[data-testid='import-preview']")
+      refute has_element?(view, "[data-testid='import-results-panel']")
+
+      # No member was created during preview (read-only step).
+      system_actor = Mv.Helpers.SystemActor.get_system_actor()
+      {:ok, members} = Membership.list_members(actor: system_actor)
+
+      refute Enum.any?(
+               members,
+               &(&1.email in ["alice.smith@example.com", "bob.johnson@example.com"])
+             )
+    end
+
+    test "confirm_import starts processing and creates members", %{
+      conn: conn,
+      valid_csv: csv_content
+    } do
+      {:ok, view, _html} = live(conn, ~p"/admin/import")
+      run_full_import(view, csv_content)
+      wait_for_import_completion()
+
+      assert has_element?(view, "[data-testid='import-results-panel']")
+
+      system_actor = Mv.Helpers.SystemActor.get_system_actor()
+      {:ok, members} = Membership.list_members(actor: system_actor)
+
+      imported =
+        Enum.filter(
+          members,
+          &(&1.email in ["alice.smith@example.com", "bob.johnson@example.com"])
+        )
+
+      assert length(imported) == 2
+    end
+
+    test "cancel_import returns to idle and hides the preview", %{
+      conn: conn,
+      valid_csv: csv_content
+    } do
+      {:ok, view, _html} = live(conn, ~p"/admin/import")
+      upload_csv_file(view, csv_content)
+      submit_import(view)
+      assert has_element?(view, "[data-testid='import-preview']")
+
+      view |> element("[data-testid='cancel-import-button']") |> render_click()
+
+      refute has_element?(view, "[data-testid='import-preview']")
+      refute has_element?(view, "[data-testid='import-results-panel']")
+    end
+  end
+
+  describe "preview contents" do
+    setup %{conn: conn} do
+      admin_user = Mv.Fixtures.user_with_role_fixture("admin")
+
+      conn =
+        conn
+        |> MvWeb.ConnCase.conn_with_password_user(admin_user)
+        |> put_locale_en()
+
+      {:ok, conn: conn}
+    end
+
+    test "shows the column mapping table with roles for each column", %{conn: conn} do
+      csv = "email;Gruppen;Beitragsart;Bezahlstatus;UnknownCol\na@e.com;Chor;Premium;paid;x"
+
+      {:ok, view, _html} = live(conn, ~p"/admin/import")
+      upload_csv_file(view, csv)
+      submit_import(view)
+
+      assert has_element?(view, "[data-testid='preview-mapping-table']")
+      html = render(view)
+
+      assert html =~ "email"
+      assert html =~ "Gruppen"
+      assert html =~ "Beitragsart"
+      assert html =~ "Bezahlstatus"
+      assert html =~ "UnknownCol"
+    end
+
+    test "lists every CSV column exactly once in the mapping table", %{conn: conn} do
+      headers = ["email", "Gruppen", "Beitragsart", "Bezahlstatus", "UnknownCol"]
+      csv = Enum.join(headers, ";") <> "\na@e.com;Chor;Premium;paid;x"
+
+      {:ok, view, _html} = live(conn, ~p"/admin/import")
+      upload_csv_file(view, csv)
+      submit_import(view)
+
+      # Count the data rows via their stable testid so the assertion is independent
+      # of how Phoenix renders class attributes or tr tags (§1.15).
+      html = render(view)
+
+      row_count =
+        html |> String.split(~s(data-testid="preview-column-row")) |> length() |> Kernel.-(1)
+
+      assert row_count == length(headers)
+    end
+
+    test "shows up to 3 sample data rows", %{conn: conn} do
+      csv = "email\nr1@e.com\nr2@e.com\nr3@e.com\nr4@e.com"
+
+      {:ok, view, _html} = live(conn, ~p"/admin/import")
+      upload_csv_file(view, csv)
+      submit_import(view)
+
+      html = render(view)
+      assert html =~ "r1@e.com"
+      assert html =~ "r2@e.com"
+      assert html =~ "r3@e.com"
+      refute html =~ "r4@e.com"
+    end
+
+    test "shows an auto-create notice for unknown group names", %{conn: conn} do
+      csv = "email;Gruppen\na@e.com;Ganz Neue Gruppe"
+
+      {:ok, view, _html} = live(conn, ~p"/admin/import")
+      upload_csv_file(view, csv)
+      submit_import(view)
+
+      assert has_element?(view, "[data-testid='preview-groups-notice']")
+      assert render(view) =~ "Ganz Neue Gruppe"
+    end
+
+    test "shows a warning and link for unknown fee-type names", %{conn: conn} do
+      csv = "email;Beitragsart\na@e.com;Phantom Tarif"
+
+      {:ok, view, _html} = live(conn, ~p"/admin/import")
+      upload_csv_file(view, csv)
+      submit_import(view)
+
+      assert has_element?(view, "[data-testid='preview-fee-type-warning']")
+      html = render(view)
+      assert html =~ "Phantom Tarif"
+      assert html =~ "/membership_fee_settings"
+    end
+
+    test "shows an info notice when fee-type cells are empty", %{conn: conn} do
+      csv = "email;Beitragsart\na@e.com;\nb@e.com;"
+
+      {:ok, view, _html} = live(conn, ~p"/admin/import")
+      upload_csv_file(view, csv)
+      submit_import(view)
+
+      assert has_element?(view, "[data-testid='preview-fee-type-info']")
+    end
+
+    test "shows a warning for unknown custom-field columns", %{conn: conn} do
+      csv = "email;TotallyUnknown\na@e.com;value"
+
+      {:ok, view, _html} = live(conn, ~p"/admin/import")
+      upload_csv_file(view, csv)
+      submit_import(view)
+
+      assert has_element?(view, "[data-testid='preview-unknown-warning']")
+      assert render(view) =~ "TotallyUnknown"
+    end
+  end
 end