Question

我正在为Grails控制器编写单元测试，该控制器将域类呈现为JSON响应：

class MyController {
    def find = {
        def domainInst = MyDomainClass.get(params.id)
        render ([data: domainInst] as JSON)
    }
}

单元测试扩展了ControllerUnitTestCase，并为域对象提供了一个模拟：

class MyControllerTests extends ControllerUnitTestCase {
    @Before
    void setUp() {
        super.setUp()
        mockDomain(MyDomainClass, [new MyDomainClass(id: 7)])
    }

    @Test
    void testFind() {
        def inst = MyDomainClass.get(7)
        controller.params.id = inst.id
        controller.find()
        assert(controller.response.json.data.id == inst.id)
    }

除了JSON渲染之外，这一切看起来都很好用，它会散发出令人讨厌的堆栈痕迹：

| Failure:  testFind(MyControllerTests)
|  org.apache.commons.lang.UnhandledException: 
        org.codehaus.groovy.grails.web.converters.exceptions.ConverterException: Error converting Bean with class MyDomainClass
        Caused by: org.codehaus.groovy.grails.web.converters.exceptions.ConverterException: Error converting Bean with class MyDomainClass
at grails.converters.JSON.value(JSON.java:199)
at grails.converters.JSON.convertAnother(JSON.java:162)
at grails.converters.JSON.value(JSON.java:199)
at grails.converters.JSON.render(JSON.java:134)
... 5 more
        Caused by: java.lang.reflect.InvocationTargetException
... 9 more
        Caused by: groovy.lang.MissingMethodException: No signature of method: MyDomainClass.isAttached() is applicable for argument types: () values: []
        Possible solutions: isAttached(), attach()
... 9 more

将返回值更改为Map而不是域类：

render ([data: [id: domainInst.id]] as JSON)

导致JSON编组程序死于域类的原因是什么？它适用于正常环境，但不适用于模拟测试环境。有没有办法让这个测试工作？

Answer 1

看起来您可能需要进行一些微调，以使转换器意识到您正在尝试将域类呈现为JSON对象。当你手动将你的id放入一个地图时它会起作用，因为它是从一个Map对象而不是Grails域类渲染响应，而Grails域类需要经过一个特殊的ObjectMarshaller。

这样的事情：

// Domain Class
class Foo {
    String foo
}

// Controller class
class MyController {
    def find = {
        def domainInst = Foo.get(params.id)
        render domainInst as JSON
    }
}

// Controller Test Class
class MyControllerTests extends ControllerUnitTestCase {

    static application

    @Before
    void setUp() {
        super.setUp()

        // Register some common classes so that they can be converted to XML, JSON, etc.
        def convertersInit = new ConvertersConfigurationInitializer()
        convertersInit.initialize(application)
        [ List, Set, Map, Errors ].each { addConverters(it) }
        def xmlErrorMarshaller = new ValidationErrorsMarshaller()
        XML.registerObjectMarshaller(xmlErrorMarshaller)
        def jsonErrorMarshaller = new ValidationErrorsMarshaller()
        JSON.registerObjectMarshaller(jsonErrorMarshaller)

        ApplicationHolder.application.addArtefact("Domain", Foo)
        mockDomain(Foo, [new Foo(foo: "foo")] )
    }

    @Test
    void testJSON() {
        def inst = Foo.list()[0]
        controller.params.id = inst.id
        def model = controller.find()
        assert controller.response.json.foo == "foo"
    }

    @Override
    protected def bindMockWebRequest(GrailsMockHttpServletRequest mockRequest, GrailsMockHttpServletResponse mockResponse) {
        MockApplicationContext ctx = new MockApplicationContext()
        application = new DefaultGrailsApplication([testClass] as Class[], getClass().classLoader)
        application.initialise()
        ctx.registerMockBean("grailsApplication", application)
        ctx.registerMockBean(testClass.name, testClass.newInstance())
        def lookup = new TagLibraryLookup(applicationContext: ctx, grailsApplication: application)
        lookup.afterPropertiesSet()
        ctx.registerMockBean("gspTagLibraryLookup", lookup)
        ctx.registerMockBean(GroovyPagesUriService.BEAN_ID, new DefaultGroovyPagesUriService())
        mockRequest.servletContext.setAttribute(ApplicationAttributes.APPLICATION_CONTEXT, ctx)
        mockRequest.servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, ctx)

        webRequest = new GrailsWebRequest(mockRequest, mockResponse, mockRequest.servletContext)

        mockRequest.setAttribute(GrailsApplicationAttributes.WEB_REQUEST, webRequest)
        RequestContextHolder.setRequestAttributes(webRequest)
    }
}

希望这有帮助！

ControllerUnitTestCase中的域对象的JSON呈现失败

1 个答案: