ruby-on-rails - RSpec::Mocks::ExampleMethods 的未定义方法 instance_double

Question

我有一个这样的测试用例:

describe WorkCardsController do
    it "something" do
        work_card = instance_double(WorkCard, {:started?=>true} )
        #some more code
    end
end

当我运行 RSpec 时，出现错误:

undefined method 'instance_double' for #<Rspec::Core::ExampleGroup::Nested_1::Nested_8::Nested_3:0x007f0788b98778>

根据 http://rubydoc.info/github/rspec/rspec-mocks/RSpec/Mocks/ExampleMethods这种方法存在。所以我尝试通过以下方式直接访问它:

describe WorkCardsController do
    it "something" do
        work_card = RSpec::Mocks::ExampleMethods::instance_double(WorkCard, {:started?=>true} )
        #some more code
    end
end

然后我得到了一个非常令人惊讶的错误:

undefined method 'instance_double' for Rspec::Mocks::ExampleMEthods:Module

这与我上面链接的文档相反。

我错过了什么？

Answer 1

根据您指向的文档:

Mix this in to your test context (such as a test framework base class) to use rspec-mocks with your test framework.

尝试将其包含到您的代码中:

include RSpec::Mocks::ExampleMethods

你的直接方法失败了，因为调用

RSpec::Mocks::ExampleMethods::instance_double(...)

期望该方法被声明为类方法:

def self.instance_double(...)

但它已被声明为实例方法:

def instance_double(...)