Sanity test for Elixir projects. Place directly in the `test/` directory.

sanity_test.exs

defmodule App.SanityTest do
  @directory_separator "/"
  @test_dir __DIR__
  @excluded_dirs ~w(factories support fixture vcr_cassettes custom_cassettes)
  @excluded_files ~w(test_helper.exs)

  test "checks that all test files are named properly" do
    bad_files =
      Path.join([@test_dir, "**", "*"])
      |> Path.wildcard
      |> Enum.map(&Path.expand/1)
      |> Enum.reject(&File.dir?(&1))
      |> Enum.reject(&is_in_excluded_dir?/1)
      |> Enum.reject(&String.ends_with?(&1, "_test.exs"))
      |> Enum.reject(&is_excluded_file?/1)

    assert bad_files == []
  end

  defp is_in_excluded_dir?(filepath) do
    containing_dir =
      filepath
      |> String.split("/")
      |> Enum.at(-2)
    Enum.any? @excluded_dirs, &(containing_dir == &1)
  end

  defp is_excluded_file?(filepath) do
    Enum.any?(@excluded_files, &matches?(filepath, &1))
  end

  defp matches?(string, pattern) when is_binary(pattern) do
    String.ends_with?(string, pattern)
  end
  defp matches?(string, pattern) do
    String.match?(string, pattern)
  end
end