最终在 RSpec 中抛出异常的测试方法

Question

我有一个方法如下：

 if response.fetch('ok')
    response.fetch(response_key) { [] }
  elsif response.fetch('error') == 'token_revoked'
    ErrorReporter.increment('access_revoked', source: { account_id: account_id }, sporadic: true)
    fail(RemoteService::AccessRevoked, 'Our access to your account was revoked, please re-authorize.')
  else
    ErrorReporter.increment(
      'bad_request',
      source: {
        account_id: account_id
        error: response.fetch('error')
      },
      sporadic: true
    )
    fail(RemoteService::InvalidRequest, 'Something went wrong communicating with the remote service, please try again')
  end

我正在尝试测试请求 returns 出现 token_revoked 错误时的场景。我想确保测试指定在这种情况下，我们将错误报告给我们的 ErrorReporting 服务。

因此，我的规范如下所示：

it 'records the failure with our error reporting service' do
  expect(ErrorReporter).to receive(:increment).with(
    'bad_request',
     source: {
       account_id:  1
     },
     sporadic: true
   )

   available_channels.fetch
end

然而，这个规范总是失败，因为在调用 ErrorReporter 之后，代码立即调用 fail 这使得我的规范失败。有谁知道我如何在处理我知道代码现在将要抛出的不可避免的异常时验证对我的错误报告器的调用？

Answer 1

您可以expect errors在代码中提出。为了让异常被RSpec捕获，你需要使用如下的块：

it 'records the failure with our error reporting service' do
  expect(ErrorReporter).to receive(:increment).with(
    'bad_request',
    source: {
      account_id:  1
    },
    sporadic: true
  )

  expect { available_channels.fetch }
    .to raise_error RemoteService::InvalidRequest
end

Answer 2

异常导致您的示例失败，因为它没有被挽救。为防止错误，您可以将方法调用包装在 begin ... rescue 块中：

it 'records the failure with our error reporting service' do
  expect(ErrorReporter).to receive(:increment).with(
    'bad_request',
     source: {
       account_id:  1
     },
     sporadic: true
   )

   begin
     available_channels.fetch
   rescue => RemoteService::InvalidRequest
     # would cause the example to fail
   end
end

在另一个示例中，您还应该 expect 要引发的错误。

最终在 RSpec 中抛出异常的测试方法

Testing methods that eventually throw an exception in RSpec

ruby

rspec

exception-handling

ruby-on-rails