【问题标题】：Can I mock out an included module?我可以模拟一个包含的模块吗？
【发布时间】：2014-02-04 06:03:50
【问题描述】：

当一个模块被显式包含时，它很容易模拟出来，就像这样：

class MyController < ApplicationController
    MyHelper.sometimes_true_sometimes_false
end

在规范中，你只需写：

MyHelper.should_receive(:sometimes_true_sometimes_false).and_return true

在上下文中：

模块

module MyHelper
    def sometimes_true_sometimes_false
        [true, false].sample
    end
end

控制器

class MyController < ApplicationController
    def myaction
        if MyHelper.sometimes_true_sometimes_false
            @message = "Congratualtions, it's true"
        else
            @message = "Sorry, it's false"
        end
    end
end

规格

describe 'GET #myaction'
    subject { get :myaction }
    context 'when it\'s true' do
        before do
             MyHelper.should_receive(:sometimes_true_sometimes_false).and_return true
        end
        specify { expect(assigns(:message)).to eq "Congratulations, it's true" }
    end
    context 'when it\'s false' do
        before do
             MyHelper.should_receive(:sometimes_true_sometimes_false).and_return false
        end
        specify { expect(assigns(:message)).to eq "Sorry, it's true" }
    end
end

但是当模块包含在控制器中时，我应该如何编写规范，以及本机调用的类方法，如下所示：

class MyController < ApplicationController
    include MyHelper

    sometimes_true_sometimes_false
end

在上下文中：

控制器

class MyController < ApplicationController
    include MyHelper

    def myaction
        if sometimes_true_sometimes_false
            @message = "Congratualtions, it's true"
        else
            @message = "Sorry, it's false"
        end
    end
end

【问题讨论】：

标签： unit-testing rspec mocking

【解决方案1】：

实际上很简单，在我创建答案时想到了答案（并且对标题标签进行了思考）：

你只需写：

MyController.any_instance.should_receive(:sometimes_true_sometimes_false).and_return true

规格

describe 'GET #myaction'
    subject { get :myaction }
    context 'when it\'s true' do
        before do
             MyController.any_instance.should_receive(:sometimes_true_sometimes_false).and_return true
        end
        specify { expect(assigns(:message)).to eq "Congratulations, it's true" }
    end
    context 'when it\'s false' do
        before do
             MyController.any_instance.should_receive(:sometimes_true_sometimes_false).and_return false
        end
        specify { expect(assigns(:message)).to eq "Sorry, it's true" }
    end
end

【讨论】：