testing_framework.rb

def assert_equals(a, b)
  if a == b
    puts "Hooray!"
  else
    puts "It wasn't what you wanted!"
  end
end


class Object

  def do_something
    @value = 3
  end
  
  def value
    @value
  end
  
end

obj = Object.new
obj.do_something
expected_value = 3
assert_equals(obj.value, expected_value)