ruby - 如何断言某些方法被 Ruby minitest 框架调用？

Question

我想用 minitest Ruby 测试一个函数是否正确调用其他函数，但我找不到合适的 assert 来从 doc 中测试.

源代码

class SomeClass
  def invoke_function(name)
    name == "right" ? right () : wrong ()
  end

  def right
    #...
  end

  def wrong
    #...
  end
end

测试代码:

describe SomeClass do
  it "should invoke right function" do
    # assert right() is called
  end

  it "should invoke other function" do
    # assert wrong() is called
  end
end

Answer 1

Minitest 有一个特殊的 .expect :call 用于检查是否调用了某个方法。

describe SomeClass do
  it "should invoke right function" do
    mocked_method = MiniTest::Mock.new
    mocked_method.expect :call, return_value, []
    some_instance = SomeClass.new
    some_instance.stub :right, mocked_method do
      some_instance.invoke_function("right")
    end
    mocked_method.verify
  end
end

不幸的是，这个特性没有很好的记录。我是从这里找到的:https://github.com/seattlerb/minitest/issues/216