取決於Guice Provider的測試類<T>

Question

如何測試依賴Provider<> ？ 請參見下面的代碼。

class ToTest {

    @Inject
    Provider<Processor> processorProvider;

    public buildData() {
        processorProvider.get().process();
    }

    class ProcessorProviderImpl implements Provider<Processor> {
        @Inject
        private Handler someHandler;

        public Processor get() {
            return new MyProcessor(somehandler)
        }
    }

    public static class TestModule extends JukitoModule {
        @Override
        protected void configureTest() {
            bind(Processor.class).toProvider(
                    ProcessorInstanceProviderImpl.class);
            bindMock(SubHandler.class).in(TestSingleton.class);
        }
    }

    class Handler {
        @Inject
        private SubHandler subHandler; // this is singleton instance
    }
}

因此，當我模擬subHandler時不起作用，並且當我運行單元測試時，我得到一個NullPointerException ，其中subHandler.handle()被調用。

Answer 1

您可以使用Providers.of（）使用協作者實例的提供程序來初始化processorProvider。

https://google.github.io/guice/api-docs/latest/javadoc/index.html?com/google/inject/util/Providers.html

test = new ToTest();
test.processorProvider = Providers.of(processorMock);