module ConnCase is not loaded and could not be found

Cannot figure out this error.

I have this file:

test/support/conn_case.ex

defmodule ProjectWeb.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 datastructures and query the data layer.

  Finally, if the test case interacts with the database,
  it cannot be async. For this reason, every test runs
  inside a transaction which is reset at the beginning
  of the test unless the test case is marked as async.
  """

  use ExUnit.CaseTemplate

  using do
    quote do
      # Import conveniences for testing with connections
      use Phoenix.ConnTest
      import ProjectWeb.Router.Helpers

      # The default endpoint for testing
      @endpoint ProjectWeb.Endpoint
    end
  end

end

And this config on mix.ex

  # Specifies which paths to compile per environment.
  defp elixirc_paths(:test), do: ["lib", "test/support"]
  defp elixirc_paths(_),     do: ["lib"]

I have a test on test/controllers/page_controller_test.exs

defmodule ProjectWeb.PageControllerTest do
  use ProjectWeb.ConnCase

  test "GET /", %{conn: conn} do
    conn = get conn, "/"
    assert html_response(conn, 200) =~ "OK"
  end
end

Still when running mix test I receive:

** (CompileError) test/controllers/page_controller_test.exs:2: module ProjectWeb.ConnCase is not loaded and could not be found