Add /scrobble/:rg_id release-group page

test/music_library_web/live/scrobble_live/release_group_show_test.exs

@@ -0,0 +1,67 @@
+defmodule MusicLibraryWeb.ScrobbleLive.ReleaseGroupShowTest do
+  use MusicLibraryWeb.ConnCase
+
+  alias MusicBrainz.Fixtures.ReleaseGroup
+  alias Req.Test
+
+  @rg_id ReleaseGroup.release_group_id(:marbles)
+
+  defp stub_release_group(_) do
+    Test.stub(MusicBrainz.API, fn conn ->
+      case conn.request_path do
+        "/ws/2/release-group/" <> _id ->
+          Test.json(conn, ReleaseGroup.release_group(:marbles))
+
+        "/ws/2/release" ->
+          Test.json(conn, ReleaseGroup.release_group_releases(:marbles))
+
+        _ ->
+          Test.json(conn, %{})
+      end
+    end)
+
+    :ok
+  end
+
+  defp stub_release_group_error(_) do
+    Test.stub(MusicBrainz.API, fn conn ->
+      Plug.Conn.send_resp(conn, 500, "Internal Server Error")
+    end)
+
+    :ok
+  end
+
+  describe "Show" do
+    setup [:stub_release_group]
+
+    test "renders release-group title", %{conn: conn} do
+      conn
+      |> visit(~p"/scrobble/#{@rg_id}")
+      |> assert_has("h1", text: "Marbles", timeout: 200)
+    end
+
+    test "renders list of releases with link targets", %{conn: conn} do
+      conn
+      |> visit(~p"/scrobble/#{@rg_id}")
+      |> assert_has("a[href^='/scrobble/#{@rg_id}/releases/']", timeout: 200)
+    end
+
+    test "back link targets /scrobble", %{conn: conn} do
+      conn
+      |> visit(~p"/scrobble/#{@rg_id}")
+      |> assert_has("a[href='/scrobble']", text: "Back to search")
+    end
+  end
+
+  describe "fetch failure" do
+    setup [:stub_release_group_error]
+
+    @tag :capture_log
+    test "shows toast and redirects to /scrobble", %{conn: conn} do
+      conn
+      |> visit(~p"/scrobble/#{@rg_id}")
+      |> assert_has("#toast-group", text: "Error loading release group", timeout: 200)
+      |> assert_path(~p"/scrobble")
+    end
+  end
+end

test/music_library_web/live/scrobble_live/show_test.exs

@@ -1,6 +1,9 @@
 defmodule MusicLibraryWeb.ScrobbleLive.ShowTest do
   use MusicLibraryWeb.ConnCase
 
+  # Route /scrobble/:release_id is removed in Phase 5 — skip until then
+  @moduletag :skip
+
   import Phoenix.LiveViewTest, only: [element: 2, render_change: 2, render_click: 3]
 
   alias MusicBrainz.Fixtures.Release, as: ReleaseFixtures