Rspec-引发错误时参数数量错误

问题描述

因此在我的代码中，我正在尝试测试此方法:

So in my code I have this method I'm trying to test:

  # checks if a file already exists on S3
  def file_exists?(storage_key)
    begin
      s3_resource.bucket(@bucket).object(storage_key).exists?
    rescue Aws::S3::Errors::Forbidden => e
      false
    end
  end

现在，我正在尝试制作两个测试用例-一个用于文件存在的情况，另一个用于文件不存在的情况.

Now I am trying to make two test cases - one for when the file exists, and one for when it doesn't.

关注失败案例.我想对exists?进行存根处理以引发Aws::S3::Errors::Forbidden错误，以便file_exists?方法将返回false.

Focusing on the failure case. I want to stub out the exists? to raise the Aws::S3::Errors::Forbidden error so that the file_exists? method will return false.

这是我的测试代码:

  it "returns false if the file doesn't already exist" do
    allow_any_instance_of(Aws::S3::Object).to receive(:exists?).and_raise(
      Aws::S3::Errors::Forbidden
    )
    expect(instance.file_exists?('foo')).to be false
  end

运行此测试，我看到以下内容:

Running this test I see this:

   wrong number of arguments (given 0, expected 2)
   # ./lib/s3_client_builder.rb:48:in `file_exists?'

真的不知道这是怎么回事，因为file_exists?方法绝对没有2的偶数，我也没有对exists?方法进行存根.

Really not clear what's going on here, since the file_exists? method definitely doesn't have an arity of 2 nor does the exists? method I'm stubbing.

为诊断此问题，我在begin块中放置了一个断点.我尝试运行<object>.exists?行，并得到相同的错误.

To diagnose this, I put a breakpoint in the begin block. I try and run the <object>.exists? line and get the same error.

推荐答案

事实证明问题出在:

and_raise(
  Aws::S3::Errors::Forbidden
)

运行此命令将显示相同的错误:

Running this shows the same error:

raise(Aws::S3::Errors::Forbidden)

这是什么工作:

raise(Aws::S3::Errors::Forbidden.new(nil, nil))

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