Ruby-on-rails 如何使用 RSpec 的 should_raise 有任何异常？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/1722749/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to use RSpec's should_raise with any kind of exception?
提问by marcgg
I'd like to do something like this:
我想做这样的事情：
some_method.should_raise <any kind of exception, I don't care>
How should I do this?
我该怎么做？
some_method.should_raise exception
... doesn't work.
...不起作用。
回答by Avdi
expect { some_method }.to raise_error
RSpec 1 Syntax:
RSpec 1 语法：
lambda { some_method }.should raise_error
See the documentation(for RSpec 1 syntax) and RSpec 2 documentationfor more.
有关更多信息，请参阅文档（有关 RSpec 1 语法）和RSpec 2 文档。
回答by joelparkerhenderson
RSpec 2
规格 2
expect { some_method }.to raise_error
expect { some_method }.to raise_error(SomeError)
expect { some_method }.to raise_error("oops")
expect { some_method }.to raise_error(/oops/)
expect { some_method }.to raise_error(SomeError, "oops")
expect { some_method }.to raise_error(SomeError, /oops/)
expect { some_method }.to raise_error(...){|e| expect(e.data).to eq "oops" }
# Rspec also offers to_not:
expect { some_method }.to_not raise_error
...
Note: raise_errorand raise_exceptionare interchangeable.
注：raise_error和raise_exception可以互换。
RSpec 1
规格 1
lambda { some_method }.should raise_error
lambda { some_method }.should raise_error(SomeError)
lambda { some_method }.should raise_error(SomeError, "oops")
lambda { some_method }.should raise_error(SomeError, /oops/)
lambda { some_method }.should raise_error(...){|e| e.data.should == "oops" }
# Rspec also offers should_not:
lambda { some_method }.should_not raise_error
...
Note: raise_erroris an alias for raise_exception.
注意：raise_error是 的别名raise_exception。
Documentation: https://www.relishapp.com/rspec
文档：https: //www.relishapp.com/rspec
RSpec 2:
规范 2：
- https://www.relishapp.com/rspec/rspec-expectations/v/2-13/docs/built-in-matchers/raise-error-matcher
- https://www.relishapp.com/rspec/rspec-expectations/v/2-13/docs/built-in-matchers/raise-error-matcher
RSpec 1:
规范 1：
回答by racc
回答by ayckoster
The syntax changed recently and now it is:
语法最近发生了变化，现在是：
expect { ... }.to raise_error(ErrorClass)
回答by Bruno E.
From version 3.3 on rspec-expectionsgem raises a warning for a blank raise_error without a parameter
从版本 3.3 开始，rspec-expectionsgem 会针对没有参数的空白 raise_error 发出警告
expect { raise StandardError }.to raise_error # results in warning
expect { raise StandardError }.to raise_error(StandardError) # fine
This gives you a hint that your code may fail with a different error than the test intended to check.
这给你一个提示，你的代码可能会因为与测试要检查的错误不同的错误而失败。
WARNING: Using the
raise_errormatcher without providing a specific error or message risks false positives, sinceraise_errorwill match when Ruby raises aNoMethodError,NameErrororArgumentError, potentially allowing the expectation to pass without even executing the method you are intending to call. Instead consider providing a specific error class or message. This message can be supressed by setting:RSpec::Expectations.configuration.warn_about_potential_false_positives = false.
警告：在
raise_error不提供特定错误或消息的情况下使用匹配器有误报的风险，因为raise_error当 Ruby 引发NoMethodError,NameErroror时将匹配ArgumentError，可能允许期望通过甚至不执行您打算调用的方法。而是考虑提供特定的错误类或消息。可以通过设置来抑制此消息：RSpec::Expectations.configuration.warn_about_potential_false_positives = false。
