Generate project

Using `mix phx.new music_library --database sqlite3 --binary-id --no-mailer`

test/music_library_web/controllers/error_html_test.exs

@@ -0,0 +1,14 @@
+defmodule MusicLibraryWeb.ErrorHTMLTest do
+  use MusicLibraryWeb.ConnCase, async: true
+
+  # Bring render_to_string/4 for testing custom views
+  import Phoenix.Template
+
+  test "renders 404.html" do
+    assert render_to_string(MusicLibraryWeb.ErrorHTML, "404", "html", []) == "Not Found"
+  end
+
+  test "renders 500.html" do
+    assert render_to_string(MusicLibraryWeb.ErrorHTML, "500", "html", []) == "Internal Server Error"
+  end
+end

test/music_library_web/controllers/error_json_test.exs

@@ -0,0 +1,12 @@
+defmodule MusicLibraryWeb.ErrorJSONTest do
+  use MusicLibraryWeb.ConnCase, async: true
+
+  test "renders 404" do
+    assert MusicLibraryWeb.ErrorJSON.render("404.json", %{}) == %{errors: %{detail: "Not Found"}}
+  end
+
+  test "renders 500" do
+    assert MusicLibraryWeb.ErrorJSON.render("500.json", %{}) ==
+             %{errors: %{detail: "Internal Server Error"}}
+  end
+end

test/music_library_web/controllers/page_controller_test.exs

@@ -0,0 +1,8 @@
+defmodule MusicLibraryWeb.PageControllerTest do
+  use MusicLibraryWeb.ConnCase
+
+  test "GET /", %{conn: conn} do
+    conn = get(conn, ~p"/")
+    assert html_response(conn, 200) =~ "Peace of mind from prototype to production"
+  end
+end