NoMethodError：未定义的方法`assert_equal'与minitest

Question

我在下面有用于自动化测试的测试结构。

#/project/class/Calculator.rb

require 'TestModule'
require 'MathOperation'

class Calculator
  include TestModule
  include MathOperation

  def initialize(num1, num2)
    @num1 = num1
    @num2 = num2
  end
end


#/project/methods/MathOperation.rb

module MathOperation
    def operation_addition
        addition = @num1 + @num2
        return addition
    end
end


#/project/methods/TestModule.rb

module TestModule
    def test_addition(value)
       assert_equal 25, value
    end   
end


#/project/tescases/TestCalculator.rb

require 'minitest/autorun'
require 'calculator'

class TestCalculator < Minitest::Test

  def setup
    @calc = Calculator.new(15, 10)
  end

  def test_proper_addition
    resolution = @calc.operation_addition
    @calc.test_addition(resolution)
  end
end

当我执行测试类 TestCalculator 时收到此错误。

NoMethodError: undefined method 'assert_equal' for #<Calculator:0x00000002a77518 @num1=15, @num2=10

当我在 TestCalculator 类中使用 assert_equal 方法时，它起作用了。但是这种方式会在未来造成冗长的测试用例和冗余代码。如何在 minitest 类调用的模块中使用“断言”？是否可以？

Answer 1

所有问题都来自您的TestModule 模块。该模块的含义只有在您查看所有其他代码以在上下文中理解它时才能清楚 - 这是对封装原则的公然违反。为什么值 25 很重要？当代码只是断言相等而不执行任何加法时，为什么该方法称为test_addition？完全删除该模块。

然后查看minitest documentation 中的示例以了解预期用途。让Calculator 做所有的工作，而TestCalculator 做断言：

# no testing code here, just functionality

module MathOperation
  def operation_addition
    addition = @num1 + @num2
  end
end

class Calculator
  include MathOperation

  def initialize(num1, num2)
    @num1 = num1
    @num2 = num2
  end
end

# and now we do all of the testing stuff

require 'minitest/autorun'

class TestCalculator < Minitest::Unit::TestCase
  def setup
    @calc = Calculator.new(15, 10)
  end

  def test_addition
    assert_equal 25, @calc.operation_addition
  end
end