Unit testing in Elixir Livebook

25 Jan 2023 11:19 elixir livebook testing

I’ve written some code in Elixir Livebook, and I’d like to write some unit tests for it. Here’s how I did it.

Add a code block with the following:

ExUnit.configure(exclude: [:skip])
ExUnit.start(autorun: false)

The exclude: [:skip] part allows you to mark tests with @tag :skip to, well, skip them. There’s an example of this below.

Then, for each set of tests:

defmodule FooTest do
  use ExUnit.Case

  test "it works" do
    assert true
  end
end

ExUnit.run()

defmodule BarTest do
  use ExUnit.Case

  test "it doesn't not work" do
    refute false
  end

  @tag :skip
  test "this is skipped" do
    assert :up == :down
  end
end

ExUnit.run()