checkin of first version

test/live_view_counter_web/controllers/page_controller_test.exs

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+defmodule LiveViewCounterWeb.PageControllerTest do
+  use LiveViewCounterWeb.ConnCase
+
+  test "GET /", %{conn: conn} do
+    conn = get(conn, "/")
+    assert html_response(conn, 200) =~ "The count is"
+  end
+end

test/live_view_counter_web/views/error_view_test.exs

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+defmodule LiveViewCounterWeb.ErrorViewTest do
+  use LiveViewCounterWeb.ConnCase, async: true
+
+  # Bring render/3 and render_to_string/3 for testing custom views
+  import Phoenix.View
+
+  test "renders 404.html" do
+    assert render_to_string(LiveViewCounterWeb.ErrorView, "404.html", []) == "Not Found"
+  end
+
+  test "renders 500.html" do
+    assert render_to_string(LiveViewCounterWeb.ErrorView, "500.html", []) == "Internal Server Error"
+  end
+end

test/live_view_counter_web/views/layout_view_test.exs

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+defmodule LiveViewCounterWeb.LayoutViewTest do
+  use LiveViewCounterWeb.ConnCase, async: true
+
+  # When testing helpers, you may want to import Phoenix.HTML and
+  # use functions such as safe_to_string() to convert the helper
+  # result into an HTML string.
+  # import Phoenix.HTML
+end

test/live_view_counter_web/views/page_view_test.exs

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+defmodule LiveViewCounterWeb.PageViewTest do
+  use LiveViewCounterWeb.ConnCase, async: true
+end

test/support/conn_case.ex

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+defmodule LiveViewCounterWeb.ConnCase do
+  @moduledoc """
+  This module defines the test case to be used by
+  tests that require setting up a connection.
+
+  Such tests rely on `Phoenix.ConnTest` and also
+  import other functionality to make it easier
+  to build common data structures and query the data layer.
+
+  Finally, if the test case interacts with the database,
+  we enable the SQL sandbox, so changes done to the database
+  are reverted at the end of every test. If you are using
+  PostgreSQL, you can even run database tests asynchronously
+  by setting `use LiveViewCounterWeb.ConnCase, async: true`, although
+  this option is not recommended for other databases.
+  """
+
+  use ExUnit.CaseTemplate
+
+  using do
+    quote do
+      # Import conveniences for testing with connections
+      import Plug.Conn
+      import Phoenix.ConnTest
+      import LiveViewCounterWeb.ConnCase
+
+      alias LiveViewCounterWeb.Router.Helpers, as: Routes
+
+      # The default endpoint for testing
+      @endpoint LiveViewCounterWeb.Endpoint
+    end
+  end
+
+  setup _tags do
+    {:ok, conn: Phoenix.ConnTest.build_conn()}
+  end
+end

test/test_helper.exs

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+ExUnit.start()