Rspec any_instance.stub 为 nil:NilClass 异常引发未定义的方法 `any_instance_recorder_for' [英] Rspec any_instance.stub raises undefined method `any_instance_recorder_for' for nil:NilClass exception

问题描述

这是我正在测试的包含在 Foo.rb 中的类:

Here is the class that I'm testing contained in Foo.rb:

class Foo
    def bar
        return 2
    end
end

这是我在 Foo_spec.rb 中包含的测试:

Here is the my test contained in Foo_spec.rb:

require "./Foo.rb"

describe "Foo" do
    before(:all) do
        puts "#{Foo == nil}"
        Foo.any_instance.stub(:bar).and_return(1)
    end

    it "should pass this" do
        f = Foo.new
        f.bar.should eq 1
    end
end

我得到以下输出:

false
F

Failures:

  1) Foo Should pass this
     Failure/Error: Foo.any_instance.stub(:bar).and_return(1)
     NoMethodError:
       undefined method `any_instance_recorder_for' for nil:NilClass
     # ./Foo_spec.rb:6:in `block (2 levels) in <top (required)>'

Finished in 0 seconds
1 example, 1 failure

Failed examples:

rspec ./Foo_spec.rb:9 # Foo Should pass this

我咨询过the doc 和给出的示例在我的机器上传递(所以它不是 rspec 代码的问题)，但它没有给我任何关于什么的信息我可能做错了.错误消息也很令人困惑，因为它告诉我不要在 nil:NilClass 上调用 .any_instance，但正如我用我的输出证明的那样，Foo 不是 nil.我应该如何在我的自定义对象上调用 .any_instance.stub?

I've consulted the doc and the example given is passing on my machine (so it isn't a problem with the rspec code), but it isn't giving me any information on what I might be doing wrong. The error message is also quite confusing as it's telling me not to call .any_instance on a nil:NilClass, but as I proved with my output, Foo isn't nil. How am I supposed to call .any_instance.stub on my custom object?

我使用的是 Ruby 1.9.3 和 rspec 2.14.5.

I'm using Ruby 1.9.3 and rspec 2.14.5.

推荐答案

你应该使用 before(:each) 进行 stubbing.

You should use before(:each) for stubbing.

不支持 before(:all) 中的存根.原因是所有的存根和模拟在每个示例之后都被清除，所以在 before(:all) 中设置的任何存根都可以在碰巧在该组中运行的第一个示例中工作，但不能对于任何其他人.

Stubs in before(:all) are not supported. The reason is that all stubs and mocks get cleared out after each example, so any stub that is set in before(:all) would work in the first example that happens to run in that group, but not for any others.

rspec-mocks 自述文件

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