试图验证的Groovy闭包在一个单元测试

Question

我试图验证，在一类这个常规闭合称为CUTService有正确的价值观：

mailService.sendMail { 
    to 'hey@example.com' 
    from 'hey@example.com' 
    subject 'Stuff' 
    body 'More stuff' 
} 

我已经看了https://github.com/craigatk/spock-mock-cheatsheet/raw/master/spock-mock-cheatsheet.pdf，但他的语法产生错误：

1 * mailService.sendMail({ Closure c -> c.to == 'hey@example.com'}) 

groovy.lang.MissingPropertyException: No such property: to for class: com...CUTService 

我已经看了Is there any way to do mock argument capturing in Spock，并试图此：

1 * mailService.sendMail({closure -> captured = closure }) 
assertEquals 'hey@example.com', captured.to 

主要生产：

groovy.lang.MissingPropertyException: No such property: to for class: com...CUTService 

我也试过这样：

1 * mailService.sendMail({captured instanceof Closure }) 
assertEquals 'hey@example.com', captured.to 

主要生产：

Too few invocations for: 
1 * mailService.sendMail({captured instanceof Closure }) (0 invocations) 

... 

Unmatched invocations (ordered by similarity): 
1 * mailService.sendMail(com...CUTService$_theMethod_closure5@21a4c83b) 

什么我需要做的就是这个工作？

Answer 1

当你写：

mailService.sendMail { 
    to 'hey@example.com' 
    from 'hey@example.com' 
    subject 'Stuff' 
    body 'More stuff' 
} 

事实上，您正在执行的方法sendMail，具有封闭℃。 sendMail创建一个委托，并用这个委托调用你的闭包。你封在现实中执行如下：

delegate.to('hey@example.com') 
delegate.from('hey@example.com') 
delegate.subject('Stuff') 
delegate.body('More stuff') 

为了测试这种封，你应该创建一个模拟，配置封授人以这种模拟，调用关闭，并验证模拟的期望。

由于这个任务是不是真的微不足道，这是更好地重用邮件插件，并创建了自己的邮件建设者：

given: 
    def messageBuilder = Mock(MailMessageBuilder) 

when: 
    // calling a service 

then: 
    1 * sendMail(_) >> { Closure callable -> 
     callable.delegate = messageBuilder 
     callable.resolveStrategy = Closure.DELEGATE_FIRST 
     callable.call(messageBuilder) 
    } 
    1 * messageBuilder.to("hey@example.com") 
    1 * messageBuilder.from("hey@example.com")