Test::Unit::Assertions contains the standard Test::Unit assertions. Assertions is included in Test::Unit::TestCase.

To include it in your own code and use its functionality, you simply need to rescue Test::Unit::AssertionFailedError. Additionally you may override add_assertion to get notified whenever an assertion is made.

Notes:

• The message to each assertion, if given, will be propagated with the failure.

• It is easy to add your own assertions based on assert_block().

Example Custom Assertion

def deny(boolean, message = nil)
  message = build_message message, '<?> is not false or nil.', boolean
  assert_block message do
    not boolean
  end
end