feat: improve oidc only mode

test/mv_web/live/global_settings_live_test.exs

@@ -110,4 +110,69 @@ defmodule MvWeb.GlobalSettingsLiveTest do
       assert html =~ "SMTP" or html =~ "E-Mail" or html =~ "Settings"
     end
   end
+
+  describe "Authentication section when OIDC-only is enabled" do
+    setup %{conn: conn} do
+      user = create_test_user(%{email: "admin@example.com"})
+      conn = conn_with_oidc_user(conn, user)
+      {:ok, settings} = Membership.get_settings()
+      original_oidc_only = Map.get(settings, :oidc_only, false)
+      {:ok, _} = Membership.update_settings(settings, %{oidc_only: true})
+      {:ok, conn: conn, original_oidc_only: original_oidc_only}
+    end
+
+    @describetag :ui
+    test "registration checkbox is disabled when OIDC-only is enabled", %{
+      conn: conn,
+      original_oidc_only: original
+    } do
+      try do
+        {:ok, view, _html} = live(conn, ~p"/settings")
+        assert has_element?(view, "#registration-enabled-checkbox[disabled]")
+      after
+        {:ok, s} = Membership.get_settings()
+        Membership.update_settings(s, %{oidc_only: original})
+      end
+    end
+
+    @describetag :ui
+    test "OIDC-only hint is visible when OIDC-only is enabled", %{
+      conn: conn,
+      original_oidc_only: original
+    } do
+      try do
+        {:ok, view, _html} = live(conn, ~p"/settings")
+        assert has_element?(view, "[data-testid='oidc-only-registration-hint']")
+      after
+        {:ok, s} = Membership.get_settings()
+        Membership.update_settings(s, %{oidc_only: original})
+      end
+    end
+
+    test "when OIDC-only is disabled, registration checkbox is enabled and can be toggled", %{
+      conn: conn,
+      original_oidc_only: original
+    } do
+      try do
+        {:ok, settings} = Membership.get_settings()
+        Membership.update_settings(settings, %{oidc_only: false})
+
+        {:ok, view, _html} = live(conn, ~p"/settings")
+        refute has_element?(view, "#registration-enabled-checkbox[disabled]")
+
+        initial_checked =
+          view |> element("#registration-enabled-checkbox") |> render() =~ "checked"
+
+        view
+        |> element("#registration-enabled-checkbox")
+        |> render_click()
+
+        new_checked = view |> element("#registration-enabled-checkbox") |> render() =~ "checked"
+        assert new_checked != initial_checked
+      after
+        {:ok, s} = Membership.get_settings()
+        Membership.update_settings(s, %{oidc_only: original})
+      end
+    end
+  end
 end