assert_each.rb

class Test::Unit::TestCase

  def assert_each(assertions)
    error_messages = ""
    assertions.each do |assertion, message, *variables|
      template = message.nil? ? "<?> is not true." : message
      if variables.empty?
        msg = build_message(nil, template, assertion)
      else
        msg = build_message(nil, template, *variables)
      end
      if err = safe_assert_block(msg){ assertion }
        error_messages << err.to_s << "\n"
      end
    end
    raise Test::Unit::AssertionFailedError.new(error_messages) if !error_messages.blank?
  end
  
  def safe_assert_block(message="assert_block failed.")
    _wrap_assertion do
      if (! yield)
        message
      end
    end
  end

end

some_test.rb

class SomeTest
  context "Foo" do
    should "be foo like" do
      assert_each([['bar'.eql?('foo')],
                   ['foo'.eql?('bar'), "foo should be foo but was <?>", 'bar'],
                   ['blah'.eql?('foo'), "foo and <?>", 'yes'],
                   ['bar'.eql?('baz'), "<?> and <?>", 'bar', 'baz']])
    end
  end
end

some_test_result.txt

  1) Failure:
test: Foo should be foo like. (SomeTest)
 ...
<false> is not true.
foo should be foo but was <"bar">
foo and <"yes">
<"bar"> and <"baz">