How to Mock Injected Dependencies

Question

我想在下面的JUnit测试类中使用Guice来注入模拟依赖项,特别是resource.我怎样才能做到这一点？

测试

public class SampleResourceTest extends ResourceTest {  

    @Override
    protected void setUpResources() throws Exception {
        // when(dao.getSample(eq("SIP"), eq("GA"))).thenReturn(sam);
        addResource(new SampleResource());
    }

    @Test
    public void getSampleTest() {
        Assert.assertEquals(sam, client().resource("/sample/SIP/GA").get(Sample.class));
    }

}

资源

@Path("/sample")
@Produces(MediaType.APPLICATION_JSON)
public class SampleResource {   

    @Inject
    private SampleDao samDao;

    @GET
    @Path("/{sample}/{id}")
    public Sample getSample(@PathParam("id") String id) {
        return samDao.fetch(id);
    }

}

Answer 1

考虑使用另一个测试模块覆盖Guice注入配置.

我将使用自己的示例来展示它,但它很容易适应您的需求.

Module testModule = Modules.override(new ProductionModule())
    .with(new AbstractModule(){

    @Override
    protected void configure() {
        bind(QueueFactory.class).toInstance(spy(new QueueFactory()));
    }

});

Injector injector = Guice.createInjector(testModule);
QueueFactory qFactorySpy = injector.getInstance(QueueFactory.class);

Answer 2

一种选择是在创建 Guice 注入器时将 Mock DAO 实例绑定到 DAO 类。然后，当您添加 时SampleResource，请改用 getInstance 方法。像这样的东西：

Injector injector = Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
            bind(SampleDao.class).toInstance(mockDao);
        }
});

addResource(injector.getInstance(SampleResource.class);