3

我正在为将域类呈现为 JSON 响应的 Grails 控制器编写单元测试：

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)
    }

这一切似乎都运行良好，除了 JSON 渲染，它吐出一个讨厌的堆栈跟踪：

| 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

将返回更改为 Map 而不是域类有效：

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

是什么导致 JSON 编组器在域类上死掉？它可以在正常环境中工作，但不能在模拟测试环境中。有没有办法使这个测试工作？

4

1 回答 1

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。当您手动将 id 放入地图时，它会起作用，因为它正在呈现来自 Map 对象而不是 Grails 域类的响应，后者需要通过特殊的 ObjectMarshaller。

像这样的东西：

// 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)
    }
}

希望这可以帮助！

于 2012-09-05T20:50:59.013 回答