BadSeed

Stores and reuses ExUnit seeds from failing test runs.

How it works

Whenever a test run finishes unsuccesfully, BadSeed will store the used seed in a file in the project's directory named _build/test/.bad_seed. When the suite is run again, it'll automatically reuse that seed. If a test run passes with that seed, _build/test/.bad_seed is removed to allow ExUnit to generate random seeds again.

Installation

1. Add bad_seed to your list of dependencies in mix.exs:

  def deps do
    [
      {:bad_seed, "~> 0.1.0", only: :test}
    ]
  end

1. Call BadSeed.setup() in test/test_helper.exs:

  BadSeed.setup()
  ExUnit.start()

1. Run your tests like normal.