如何使 rspec-mocks 期望 receive.with 急切失败

Question

rspec-mocks' expect(target).to receive(:message).with(arg_matcher) 仅在使用与传递给 with 的 arg 匹配器不匹配的参数调用目标时，才会在测试结束时显示错误。有没有办法强制它急切地失败——即，一旦使用不匹配的参数调用目标？ RR是这样工作的。

我面临的问题是，当我如上所述使用 arg_matcher 设置此模拟时，测试开始失败，因为使用不同的参数调用目标，但随后另一个断言在结束之前失败测试，所以我只看到这个断言的错误，而不是丢失的模拟（这会告诉我预期参数和实际调用的参数之间的区别）。

使用 rspec-mocks 3.3.2.

Answer 1

the test starts failing because the target is called with different params, but then another assertion fails before the end of the test, so I only see the error from this assertion, not from the missing mock

如果我没看错，你在一个规范中有多个 expect 断言，而第一个断言失败了，所以你没有看到 second/third 断言失败？

如果是这样，我会考虑使用 RSpec's aggregate_failures introduced in v3.3，它收集失败但运行后续断言：

aggregate_failures("verifying response") do
  expect(response.status).to eq(200)
  expect(response.headers).to include("Content-Type" => "text/plain")
  expect(response.body).to include("Success")
end

# Which gives you nice errors for all assertions

1) Client returns a successful response
     Got 3 failures:

     1.1) Got 3 failures from failure aggregation block "testing response".
          # ./spec/use_block_form_spec.rb:18
          # ./spec/use_block_form_spec.rb:10

          1.1.1) Failure/Error: expect(response.status).to eq(200)

                   expected: 200
                        got: 404

                   (compared using ==)
                 # ./spec/use_block_form_spec.rb:19

          1.1.2) Failure/Error: expect(response.headers).to include("Content-Type" => "application/json")
                   expected {"Content-Type" => "text/plain"} to include {"Content-Type" => "application/json"}
                   Diff:
                   @@ -1,2 +1,2 @@
                   -[{"Content-Type"=>"application/json"}]
                   +"Content-Type" => "text/plain",
                 # ./spec/use_block_form_spec.rb:20

          1.1.3) Failure/Error: expect(response.body).to eq('{"message":"Success"}')

                   expected: "{\"message\":\"Success\"}"
                        got: "Not Found"

                   (compared using ==)
                 # ./spec/use_block_form_spec.rb:21

     1.2) Failure/Error: expect(false).to be(true), "after hook failure"
            after hook failure
          # ./spec/use_block_form_spec.rb:6
          # ./spec/use_block_form_spec.rb:10

     1.3) Failure/Error: expect(false).to be(true), "around hook failure"
            around hook failure
          # ./spec/use_block_form_spec.rb:12

您还可以将描述块标记为 aggregate_failures:

RSpec.describe ClassName, :aggregate_failures do
  # stuff
end

Answer 2

我不知道有什么方法可以让 receive 急切地失败。但是，have_received 急切地失败了，因此如果它是多个期望中的第一个，它将是未通过测试且 RSpec 报告的期望。

class Foo
  def self.bar(baz)
  end
end

describe "RSpec" do
  it "reports a non-mock expectation failure before a mock expectation failure" do
    expect(Foo).to receive(:bar).with(1)
    expect(true).to be_falsy # RSpec reports this failure
    Foo.bar 2
  end

  it "reports a spy expectation failure when you'd expect it to be reported" do
    allow(Foo).to receive(:bar) # Spy on Foo
    Foo.bar 2
    expect(Foo).to have_received(:bar).with(1) # RSpec reports this failure
    expect(true).to be_falsy
  end

end

详情见the documentation of RSpec spies。

如果

，这个解决方案可能是最好的

如果您喜欢像我一样按逻辑 arrange-act-assert 顺序进行测试
如果间谍期望失败，你不关心其他期望
如果你介意设置间谍的 allow 的额外输入比你介意 aggregate_failures 块

常规模拟和 Adarsh 的解决方案更好

无论是否失败，您都希望看到两种期望的结果
如果你介意 aggregate_failures 块比你介意设置间谍的 allow 的额外输入更少

如何使 rspec-mocks 期望 receive.with 急切失败

How to make rspec-mocks' expect to receive.with fail eagerly

ruby

rspec

rspec-mocks