Missing Rails-style declarative helpers in your plain minitest/unit test suite? Here's something to get you started.

minitest_unit_decl.rb

class MiniTest::Unit::TestCase
  class << self # The def self.test way of doing it doesn't override Kernel.test but this does...
    def test(name, &block)
      method_name = "test_#{ name.gsub(/[\W]/, '_') }"
      if block.nil?
        define_method(method_name) do
          flunk "Missing implementation for test #{name.inspect}"
        end
      else
        define_method(method_name, &block)
      end
    end
  end
end