tl; dr

Question

主要用于测试调试目的，我想知道是否有办法判断方法是否存在。

例如，在我的一个测试中，我写道：

Model.any_instance.stub(:method)

当我有一个真实的实例时，我想写一些类似的东西：

an_instance_of_model.stubbed?(:method) # expecting to return true

Answer 1

如果您使用any_instance方法在类级别中隐藏了方法，您可以在测试中使用以下内容检查：

RSpec::Mocks.any_instance_recorder_for(YourClass).already_observing?(:method_name)

但如果你存根特定的实例，你可以使用以下方法找到它：

!(your_instance.method(:method_name).owner >= your_instance.class)

所以你也可以在辅助模块中组合这些：

module Helpers
  def stubbed?(object, method)
    RSpec::Mocks.any_instance_recorder_for(object.class).already_observing?(method) || !(object.method(method).owner >= object.class)
  end
end

并将其包含在RSpec.configure中：

require 'helpers'
RSpec.configure do |config|
  ...
  config.include Helpers
  ...
end

Answer 2

tl; dr

在doesn't appear to be documented very well之后，从@PJSCopeland's comment开始，看来您可以使用RSpec::Mocks.space.registered?检查是否存在“模拟代理”：

# eg. allow(Rails.configuration.action_controller).to receive(:allow_forgery_protection).and_return(true)

RSpec::Mocks.space.registered?(Rails.configuration.action_controller)
# => true

RSpec::Mocks.space.registered?(Rails.configuration)
# => false

更深入

在撬调试会话中，我们可以看到：

ls RSpec::Mocks
# => RSpec::Mocks.methods: allow_message  configuration  error_generator  expect_message  setup  space  teardown  verify  with_temporary_scope

ls RSpec::Mocks.space
# => RSpec::Mocks::Space#methods: any_instance_mutex  any_instance_proxy_for  any_instance_recorder_for  any_instance_recorders  any_instance_recorders_from_ancestry_of  constant_mutator_for  ensure_registered  new_scope  proxies  proxies_of  proxy_for  proxy_mutex  register_constant_mutator  registered?  reset_all  superclass_proxy_for  verify_all

查看https://github.com/rspec/rspec-mocks/blob/master/lib/rspec/mocks/space.rb#L127-L129，我们可以看到registered?检查了proxies.key?，其中proxies是RSpec::Space类的attr：

module RSpec
  module Mocks
    # ..snip..
    class Space
      attr_reader :proxies, :any_instance_recorders, :proxy_mutex, :any_instance_mutex
      # ..snip..
      def registered?(object)
        proxies.key?(id_for object)
      end
      # ..snip..
    end
  end
end

撬起，我们可以看到proxies是一个Hash，它将一个ID号（由id_for创建）映射到表示该模拟的RSpec::Mocks::Proxy实例：

RSpec::Mocks.space.proxies.class
# => Hash

RSpec::Mocks.space.proxies.map { |k,v| v.class }
# => [RSpec::Mocks::PartialClassDoubleProxy, RSpec::Mocks::PartialDoubleProxy]

从可用方法中可以看到，如果我们愿意，这将使我们有很深的机会来玩模拟游戏：

ls RSpec::Mocks.space.proxies.map { |k,v| v }.first
# RSpec::Mocks::Proxy#methods: add_message_expectation  add_stub  as_null_object  build_expectation  check_for_unexpected_arguments  ensure_implemented  has_negative_expectation?  messages_arg_list  method_double_if_exists_for_message  null_object?  object  prepended_modules_of_singleton_class  raise_missing_default_stub_error  raise_unexpected_message_error  received_message?  record_message_received  remove_stub  remove_stub_if_present  replay_received_message_on  verify
# RSpec::Mocks::PartialDoubleProxy#methods: add_simple_expectation  add_simple_stub  message_received  reset  visibility_for
# RSpec::Mocks::PartialClassDoubleProxyMethods#methods: original_method_handle_for

示例：重置模拟值

例如，如果我们想reset将此模拟恢复为未经模拟的默认值，则可以使用RSpec::Mocks.space.proxy_for助手来找到我们的模拟，然后reset进行模拟：

# when
#   Rails.configuration.action_controller.allow_forgery_protection == false
# and
#   allow(Rails.configuration.action_controller).to receive(:allow_forgery_protection).and_return(true)

RSpec::Mocks.space.registered?(Rails.configuration.action_controller)
# => true

Rails.configuration.action_controller.allow_forgery_protection
# => true

RSpec::Mocks.space.proxy_for(Rails.configuration.action_controller).reset

Rails.configuration.action_controller.allow_forgery_protection
# => false

但是请注意，即使已重置模拟值，该模拟仍为registered?：

RSpec::Mocks.space.registered?(Rails.configuration.action_controller)
# => true

有没有办法检查方法是否与RSpec存根？

2 个答案:

tl; dr

更深入

示例：重置模拟值