For the past few months, I’ve been using NUnit. A few days ago I started using ruby’s Test::Unit – the only thing I miss from nunit is Assert.IsFalse(). So here’s something that will do the job… add the following code somewhere early on in the sequence:

module Test::Unit::Assertions
  def assert_false(object, message="")
    assert_equal(false, object, message)
  end
end

Here’s some code you can stick in a file that will prove the above method works:

require "test/unit"

module Test::Unit::Assertions
  def assert_false(object, message="")
    assert_equal(false, object, message)
  end
end

puts Test::Unit::TestCase.method_defined?(:assert_false)

class MyTests < Test::Unit::TestCase
  def test_this_one_fails
    assert_false(false)
    assert_false(true)
  end
  def test_this_one_passes
    assert_false(false)
  end
  def test_this_one_passes_too
    assert(true)
  end
end

=========UPDATE=========

After emailing Nathaniel Talbott (the author of Test::Unit), it turns out that he’s no longer the maintainer. That job has passed on to Ryan Davis, and he’s writing a replacement for Test::Unit. So I guess assert_false will never make it in. If you want assert_false, use the monkeypatch above!