如何使用Ruby模拟类? [英] How do I mock a Class with Ruby?
问题描述
我使用minitest /模拟,并想模拟一个类。我不是试图测试模型类本身,而是试图测试一个服务(SomeService)与模型(SomeModel)交互。
I'm using minitest/mock and would like to mock a class. I'm not trying to test the model class itself, but rather trying to test that a service (SomeService) interacts with the model (SomeModel).
我想出了这个(Hack :: ClassDelegate),但我不相信这是一个好主意:
I came up with this (Hack::ClassDelegate), but I'm not convinced it's a good idea:
require 'minitest/autorun'
require 'minitest/mock'
module Hack
class ClassDelegate
def self.set_delegate(delegate); @@delegate = delegate; end
def self.method_missing(sym, *args, &block)
@@delegate.method_missing(sym, *args, &block)
end
end
end
class TestClassDelegation < MiniTest::Unit::TestCase
class SomeModel < Hack::ClassDelegate ; end
class SomeService
def delete(id)
SomeModel.delete(id)
end
end
def test_delegation
id = '123456789'
mock = MiniTest::Mock.new
mock.expect(:delete, nil, [id])
SomeModel.set_delegate(mock)
service = SomeService.new
service.delete(id)
assert mock.verify
end
end
我确定嘲笑类并不是一个好主意,但我有一个遗留系统,我需要写一些
I'm pretty sure that mocking a class is not a great idea anyway, but I have a legacy system that I need to write some tests for and I don't want to change the system until I've wrapped some tests around it.
推荐答案
我认为这是有点复杂。这样做:
I think that's a little complicated. What about this:
mock = MiniTest::Mock.new
SomeService.send(:const_set, :SomeModel, mock)
mock.expect(:delete, nil, [1])
service = SomeService.new
service.delete(1)
mock.verify
SomeService.send(:remove_const, :SomeModel)
这篇关于如何使用Ruby模拟类?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!