class RSpec::Matchers::DSL::Matcher

def match_unless_raises(exception=Exception, &block)

email_validator.should accept_as_valid("person@company.com")

end
end
validator.validate(candidate_address)
match_unless_raises ValidationException do |validator|
RSpec::Matchers.define :accept_as_valid do |candidate_address|

@example

rather than returning false to indicate a failure.
Use this instead of `match` when the block will raise an exception 
def match_unless_raises(exception=Exception, &block)
  @expected_exception = exception
  match(&block)
end