fix: fix CSM-012

test/bds/csm012_file_picker_async_test.exs

@@ -0,0 +1,91 @@
+defmodule BDS.CSM012FilePickerAsyncTest do
+  use ExUnit.Case, async: false
+
+  import Phoenix.ConnTest
+  import Phoenix.LiveViewTest
+
+  @endpoint BDS.Desktop.Endpoint
+
+  setup do
+    :ok = Ecto.Adapters.SQL.Sandbox.checkout(BDS.Repo)
+
+    prev = System.get_env("BDS_DESKTOP_AUTOMATION")
+    System.put_env("BDS_DESKTOP_AUTOMATION", "1")
+
+    on_exit(fn ->
+      if prev,
+        do: System.put_env("BDS_DESKTOP_AUTOMATION", prev),
+        else: System.delete_env("BDS_DESKTOP_AUTOMATION")
+    end)
+
+    temp_dir =
+      Path.join(System.tmp_dir!(), "bds-csm012-#{System.unique_integer([:positive])}")
+
+    File.mkdir_p!(temp_dir)
+    on_exit(fn -> File.rm_rf(temp_dir) end)
+
+    {:ok, project} = BDS.Projects.create_project(%{name: "CSM012", data_path: temp_dir})
+    %{project: project}
+  end
+
+  describe "file picker does not block the event handler" do
+    test "create media returns within 100ms — event handler is not blocked" do
+      {:ok, view, _html} = live(build_conn(), "/")
+
+      start_time = System.monotonic_time(:millisecond)
+      render_click(view, "create_sidebar_item", %{"kind" => "media"})
+      elapsed = System.monotonic_time(:millisecond) - start_time
+
+      assert elapsed < 100, "create_sidebar_item should return within 100ms, took #{elapsed}ms"
+    end
+
+    test "LiveView handles other events while file picker task is pending" do
+      {:ok, view, _html} = live(build_conn(), "/")
+
+      render_click(view, "create_sidebar_item", %{"kind" => "media"})
+
+      start_time = System.monotonic_time(:millisecond)
+      render_click(view, "select_view", %{"view" => "media"})
+      elapsed = System.monotonic_time(:millisecond) - start_time
+
+      assert elapsed < 100, "select_view should respond within 100ms, took #{elapsed}ms"
+    end
+
+    test "task completion does not crash the LiveView" do
+      {:ok, view, _html} = live(build_conn(), "/")
+
+      render_click(view, "create_sidebar_item", %{"kind" => "media"})
+
+      # Wait for the async task to complete (returns :cancel in automation mode)
+      Process.sleep(50)
+
+      assert Process.alive?(view.pid)
+      assert render(view)
+    end
+
+    test "file picker cancel result is handled gracefully" do
+      {:ok, view, _html} = live(build_conn(), "/")
+
+      # In automation mode, FilePicker.choose_file returns :cancel,
+      # so the task result will be :cancel
+      render_click(view, "create_sidebar_item", %{"kind" => "media"})
+      Process.sleep(50)
+
+      # LiveView should still be alive and responsive after cancel
+      assert Process.alive?(view.pid)
+      render_click(view, "select_view", %{"view" => "media"})
+      assert render(view)
+    end
+
+    test "error result from file picker does not crash LiveView" do
+      {:ok, view, _html} = live(build_conn(), "/")
+
+      # Simulate an error result being received
+      send(view.pid, {make_ref(), {:error, %{message: "dialog failed"}}})
+      Process.sleep(10)
+
+      assert Process.alive?(view.pid)
+      assert render(view)
+    end
+  end
+end