NoMethodError:带有minitest的未定义方法`assert_equal' [英] NoMethodError: undefined method `assert_equal' with minitest

问题描述

我在下面具有用于自动化测试的测试结构.

I have testing structure below for automation testing.

#/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，我会收到此错误.

When I execute test class TestCalculator I receive this error.

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

当我在类TestCalculator中使用assert_equal方法时，它起作用了.但是这种方式将在将来导致较长的测试用例和冗余代码.如何在带有minitest的类调用的模块中使用断言"?是否有可能?

When I used assert_equal method in class TestCalculator it worked. But this way will cause in future long test cases and redundant code. How can I use "assertions" in module called by class with minitest? Is it possible?

推荐答案

所有问题均来自您的TestModule模块.仅当您查看所有其他代码以在上下文中理解它时，此模块的含义才清楚-这公然违反​​了封装原理.为什么值25很重要?当代码仅声明相等性而不执行任何加法时，为什么将这种方法称为test_addition?完全删除该模块.

The problems all come from your TestModule module. The meaning of this module is only clear if you look at all of the other code to understand it in context - this is a blatant violation of the principle of encapsulation. Why is the value 25 important? Why is the method called test_addition when the code is just asserting equality and not performing any addition? Remove that module entirely.

然后查看

Then look at the examples in the minitest documentation to see the intended usage. Let Calculator do all the work, while TestCalculator does the asserting:

# 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

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