如何对使用转换器的Grails服务进行单元测试? [英] How do I unit test a Grails service that uses a converter?

问题描述

我有一个Grails服务，该服务通过执行HTTP调用使用第三方服务发送电子邮件:

class EmailService {
    def sendEmail(values) {
        def valueJson = values as JSON
        ... // does HTTP call to 3rd party service
    }
}

我已经编写了一个单元测试来测试该服务(因为集成测试启动了Hibernate和整个域框架，而我不需要):

@TestFor(EmailService)
class EmailServiceTests {
    void testEmailServiceWorks() {
        def values = [test: 'test', test2: 'test2']
        service.sendEmail(values)
    }
}

但是，当我执行此单元测试时，它在尝试进行as JSON转换时失败，并带有此异常:

org.apache.commons.lang.UnhandledException:org.codehaus.groovy.grails.web.converters.exceptions.ConverterException:不可转换的类:java.util.LinkedHashMap

然后我重新编写了单元测试以执行以下操作:

void testEmailServiceWorks() {
    def value = [test: 'test', test2: 'test2']
    def valueJson = value as JSON
}

当我尝试进行as JSON转换时，我遇到了同样的异常.

有人知道我为什么收到此异常以及如何解决该异常吗?

解决方案

当域框架启动时，将创建as JSON魔术.

您必须将测试更改为集成测试或模拟asType.

def setUp(){
    java.util.LinkedHashMap.metaClass.asType = { Class c ->
        new grails.converters."$c"(delegate)
    }
}

在tearDown中沉迷于清理工作之后，您不希望在测试套件中发生元编程泄漏.

def tearDown(){
    java.util.LinkedHashMap.metaClass.asType = null
}

如果您来自未来，请考虑以下答案: https://stackoverflow.com/a/15485593/194932

I have a Grails service that sends out e-mails using a 3rd-party service by doing a HTTP call:

class EmailService {
    def sendEmail(values) {
        def valueJson = values as JSON
        ... // does HTTP call to 3rd party service
    }
}

I've written a unit test to test this service (because an integration test spins up Hibernate and the entire domain framework, which I don't need):

@TestFor(EmailService)
class EmailServiceTests {
    void testEmailServiceWorks() {
        def values = [test: 'test', test2: 'test2']
        service.sendEmail(values)
    }
}

However, when I execute this unit test, it fails with this exception when it tries to do the as JSON conversion:

org.apache.commons.lang.UnhandledException: org.codehaus.groovy.grails.web.converters.exceptions.ConverterException: Unconvertable Object of class: java.util.LinkedHashMap

I then re-wrote my unit test to just do the following:

void testEmailServiceWorks() {
    def value = [test: 'test', test2: 'test2']
    def valueJson = value as JSON
}

And I get the same exception when it tries to do the as JSON conversion.

Does anyone know why I'm getting this exception, and how I can fix it?

解决方案

The as JSON magic is created when the domain framework spins up.

You have to either change your test to an integration one or mock the asType.

def setUp(){
    java.util.LinkedHashMap.metaClass.asType = { Class c ->
        new grails.converters."$c"(delegate)
    }
}

Rember to clean up after yourself in the tearDown, you wouldn't want metaprogramming leaks in your test suite.

def tearDown(){
    java.util.LinkedHashMap.metaClass.asType = null
}

Edit: If you come from the future, consider this answer: https://stackoverflow.com/a/15485593/194932

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