Question

编辑：提及here的方法对我有用。

我正在尝试在dropwizard应用程序中为我的Dao类编写单元测试。

应用程序主类的初始化方法如下。

public void initialize(Bootstrap<ContentAnalysisConfiguration> bootstrap) {
        GuiceBundle.Builder<ContentAnalysisConfiguration> guiceBundleBuilder = GuiceBundle.newBuilder();
        guiceBundle = guiceBundleBuilder
                .addModule(new ContentAnalysisModule())
                .setConfigClass(ContentAnalysisConfiguration.class)
                .enableAutoConfig(getClass().getPackage().getName())
                .build();
        bootstrap.addBundle(guiceBundle);
    }

Guice的module课程如下：

public class ContentAnalysisModule extends AbstractModule {

    private DBI jdbi;

    @Provides
    public DBI prepareJdbi(Environment environment, ContentAnalysisConfiguration configuration) throws ClassNotFoundException{
        // setup DB access including DAOs
        // implementing a singleton pattern here but avoiding
        // Guice to initialize DB connection too early
        if (jdbi == null) {
            final DBIFactory factory = new DBIFactory();
            jdbi = factory.build(environment, configuration.getDatabase(), "mysql");
        }
        return jdbi;
    }

    @Provides
    public AdRequestDao prepareAdRequestDao(DBI jdbi) {
        return jdbi.onDemand(AdRequestDao.class);
    }

    @Override
    protected void configure() {
        bind(Crawler.class).to(JsoupCrawler.class);
        bind(Detector.class).to(DictionaryBasedDetector.class);
    }
}

Dao类如下：

public interface AdRequestDao {

    @Mapper(AdRequestMapper.class)
    @SqlQuery("select * from ref_requests where DATE(updated_at) = :date order by updated_at")
    public List<AdRequest> getRefUrlByDate(@Bind("date") String date);

    void close();

}

然而，当我尝试从我的测试类创建一个Guice Injector时，我收到以下错误： com.google.inject.CreationException：Guice创建错误：

1) Could not find a suitable constructor in io.dropwizard.setup.Environment. Classes must have either one (and only one) constructor annotated with @Inject or a zero-argument constructor that is not private.
  at io.dropwizard.setup.Environment.class(Environment.java:53)
  at com.flipkart.flap.modules.ContentAnalysisModule.prepareJdbi(ContentAnalysisModule.java:38)

1 error
    at com.google.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:435)
    at com.google.inject.internal.InternalInjectorCreator.initializeStatically(InternalInjectorCreator.java:154)
    at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:106)
    at com.google.inject.Guice.createInjector(Guice.java:95)
    at com.google.inject.Guice.createInjector(Guice.java:72)
    at com.google.inject.Guice.createInjector(Guice.java:62)
    at com.flipkart.flap.dao.AdRequestDaoTest.createdao(AdRequestDaoTest.java:23)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:78)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:212)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:68)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)

测试类的代码如下：

public class AdRequestDaoTest {
    private AdRequestDao adRequestDao;

    @Before
    public void createdao () {
        System.out.println("At Before");
        Injector myInjector = Guice.createInjector(new ContentAnalysisModule());
        this.adRequestDao = myInjector.getInstance(AdRequestDao.class);
    }

    @Test
    public void testGetRefUrlByDate() {
        //this.adRequestDao = adRequestDao;
        String date = Utils.getCurrentDate();
        List<AdRequest> requests = adRequestDao.getRefUrlByDate(date);

        for(AdRequest request : requests) {
            assertEquals(15417220,request.getAffiliateId());
            assertEquals("http://popmp3.in/video/list/5367690",request.getRefUrl());
            assertEquals("2015-08-12 06:00:30",request.getCreatedAt());
            assertEquals("2015-08-17 16:44:20",request.getUpdatedAt());
            assertEquals(12,request.getNoOfRequests());
        }
    }
}

感谢任何帮助/建议。

Answer 1

看起来您的测试可能没有提供环境; Guice抱怨它不知道如何创建一个。

您可能需要为测试创建一个Module，它提供Environment和ContentAnalysisModule的任何其他依赖项。

Guice：Junit测试类中的创建异常

编辑：提及here的方法对我有用。

1 个答案: