gistfile1.rb

class TestCase
  class AssertionFailed < RuntimeError; end
  def assert(exp, message='Expected assertion to pass')
    unless exp
      raise AssertionFailed.new(message)
    else
      puts 'it passed'
    end
  end

  def assert_equals(actual, expected)
    assert actual == expected, "expected #{actual} to equal #{expected}"
  end
end

class FooTest < TestCase
  def assert_string_equality
    assert_equals "test", "poop"
  end
end