Grouping tests with ExUnit (Elixir)

In an old post I talked about tags in elixir and how we could use them to fake grouping of tests. See Elixir testing - Tag tests in ExUnit.

That is no longer needed.

Since 1.3 Elixir and ExUnit will let developer group tests. The syntax will be familiar to people used with rspec. The classic describe keyword.

Here is an example (shamelessly copied from the Elixir 1.3 Change log)

defmodule StringTest do
  use ExUnit.Case, async: true

  describe "String.capitalize/2" do
    test "uppercases the first grapheme" do
      assert "T" <> _ = String.capitalize("test")
    end

    test "lowercases the remaining graphemes" do
      assert "Test" = String.capitalize("TEST")
    end
  end
end

Describes are not nestable!

See the Elixir 1.3 Change log for a complete reference of what has changed recently.

Written by Simon Ström as a way to remember. It's a dev log of thinks I want to remember.