Java 如何模拟注入的依赖
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How to Mock Injected Dependencies
提问by Ari
I'd like to use Guice in the following JUnit test class to inject mock dependencies, specifically the resource. How can I do this?
我想在以下 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？
Test
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));
}
}
Resource
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);
}
}
回答by rmlan
One option would be to bind the Mock DAO instance to the DAO class when creating your Guice injector. Then, when you add the SampleResource, use the getInstance method instead. Something like this:
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);
回答by Aleksandr Kravets
Consider overriding your Guice injection configuration using another test module.
考虑使用另一个测试模块覆盖您的 Guice 注入配置。
I will show it using own example, but it's easy to adapt to your needs.
我将使用自己的示例展示它，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);
