test-unit-context

Test::Unit::Context

Makes Test::Unit::TestCase 'context-able' and thus (subjectively - hopefully) much easier to read and write. If you have ever seen RSpec than it's the very same context do ... end re-invented for Test::Unit.

Inspired by gem 'context' that does the same for the good 'old' test-unit 1.2.3 bundled with Ruby 1.8.x standard libraries.

Installation

Add it to your application's Gemfile (along with test-unit) e.g. :

group :test do
  gem 'test-unit'
  gem 'test-unit-context'
end

Or install it yourself, if you're not using Bundler :

$ gem install test-unit-context

Usage

class ChuckNorrisTest < Test::Unit::TestCase

  setup do
    @subject = ChuckNorris.new
  end

  test "can be divided by zero"
    assert_equal @subject * 2, @subject / 0
  end

  context 'frozen' do

    setup { @subject.freeze }

    test "won't answer" do
      assert_raise NoMemoryError do
        @subject.frozen?
      end
    end

    test "sqrt works"
      assert_nothing_raised do
        Math.sqrt -2
      end
    end

  end

  shared 'elementary math facts' do

    test "square root is rational"
      assert_kind_of Rational, Math.sqrt(@subject)
    end

    test "greater than infinity"
      assert @infinity < @subject
    end

    private

    setup
    def create_infinity
      @infinity = 1 / 0.0
    end

  end

  uses 'elementary math facts'

  context 'cloned' do

    setup do
      @subject = @subject.clone
    end

    test 'is Arnold Schwarzenegger' do
      assert_instance_of Terminator, @subject
      assert_nil @subject.is_a?(ChuckNorris)
    end

    like 'elementary math facts'

  end

end

Spec Mode

require 'test/unit/context/spec'

describe ChuckNorris, '#fart' do

  setup do
    @subject = ChuckNorris.new
    @subject.fart
  end

  it "creates a parallel universe" do
    assert Object.const_defined?(:Universe)
    assert_equal @subject, Universe.instance
    assert_empty ObjectSpace.each_object(Universe).to_a
  end

end
# NOTE: do not try running this at home!

Copyright

Copyright (c) 2016 Karol Bucek. See LICENSE (http://www.apache.org/licenses/LICENSE-2.0) for details.