Not mine. I just wanted to have it readily available.

test_helper.rb

# Prettier test declarations via:
# test "something being tested" do
#   test code goes here...
# end
class Test::Unit::TestCase
  def self.test(name, &block)
    test_name = "test_#{name.gsub(/\s+/,'_')}".to_sym
    defined   = instance_method(test_name) rescue false
    raise "#{test_name} is already defined in #{self}" if defined
    if block_given?
      define_method(test_name, &block)
    else
      define_method(test_name) do
        flunk "No implementation provided for #{name}"
      end
    end
  end
end