带Guice的cucumber-多Guice注射器

Question

我使用< code>Cucumber和< code>Guice作为DI。我遇到了以下问题:我有一个步骤，即

class MyStep() {

    @Inject
    private MyService myService;

    @Given("Some acction happen")
    public void sthHappen() {
        myService.doSth();
    }
}

我让这个类作为JUnit测试运行它

@RunWith(Cucumber.class)
@CucumberOptions(...)
public class MyTest {

}

有一个

class MyModule extends AbstractModule {
    @Override
    protected void configure() {
         bind(MyService.class).to(MyFirstService.class);     
    }
}

由我的MyInjectorSource使用，我定义了cucumber.properties，我定义了guice.injector-source=MyInjectorSource;还有一个包含方案的功能文件。现在一切都在工作。

不，我想使用其他MyService实现运行MyStep步骤（当然我不会重复MyStep的代码）我定义了一个具有新场景和新测试类的新功能文件

@RunWith(Cucumber.class)
@CucumberOptions(...)
public class MyOtherTest {

}

现在我试图创建另一个SunjectorSource，但我无法配置它。

Answer 1

我发现的解决方案是使用从原始Cucumber runner继承的自定义Junit4 runner，并更改其< code>createRuntime方法。

最新的cucumber guice 1.2.5使用了几个阶段来创建注入器，不幸的是，它使用了全局变量cucumber.runtime.Env.INSTANCE。此变量由cucumber填充。属性和＜code＞System.getProperties。

流量为:

• cucumber跑步者扫描可用的后端（在我的设置中是cucumber.runtime.java.JavaBackend）
• 可用的JavaBackend构造函数加载之一ObjectFactory（在我的设置中cucumber.runtime.java.guice.impl.GuiceFactory）
• GuiceFactory via Inject torSourceFactory检查Env.INSTANCE，它将创建自定义Inject torSource或默认注入器

理想情况下，cucumber应该将其在开始时创建的“RuntimeOptions”传递给后端和InjectorSource，但不幸的是，它没有这样做，而是使用了全局变量。创建这样补丁并不容易，所以我的解决方案简化了这种方法，通过读取新的注释直接在自定义运行器中创建InjectorSource。

public class GuiceCucumberRunner extends Cucumber {

    public GuiceCucumberRunner(Class<?> clazz) throws InitializationError, IOException {
        super(clazz);
    }

    @Override
    protected Runtime createRuntime(ResourceLoader resourceLoader, ClassLoader classLoader, RuntimeOptions runtimeOptions) throws InitializationError, IOException {
        Runtime result = new Runtime(resourceLoader, classLoader, Arrays.asList(createGuiceBackend()), runtimeOptions);
        return result;
    }

    private JavaBackend createGuiceBackend() {
        GuiceCucumberOptions guiceCucumberOptions = getGuiceCucumberOptions(); 
        InjectorSource injectorSource = createInjectorSource(guiceCucumberOptions.injectorSource());
        ObjectFactory objectFactory = new GuiceFactory(injectorSource.getInjector());
        JavaBackend result = new JavaBackend(objectFactory);
        return result;
    }

    private GuiceCucumberOptions getGuiceCucumberOptions() {
        GuiceCucumberOptions guiceCucumberOptions = getTestClass().getJavaClass().getAnnotation(GuiceCucumberOptions.class);
        if (guiceCucumberOptions == null) {
            String message = format("Suite class ''{0}'' is missing annotation GuiceCucumberOptions", getTestClass().getJavaClass());
            throw new CucumberException(message);
        }
        return guiceCucumberOptions;
    }

    private InjectorSource createInjectorSource(Class<? extends InjectorSource> clazz) {
        try {
            return clazz.newInstance();
        } catch (Exception e) {
            String message = format("Instantiation of ''{0}'' failed. InjectorSource must have has a public zero args constructor.", clazz);
            throw new InjectorSourceInstantiationFailed(message, e);
        }
    }

    static class GuiceFactory implements ObjectFactory {

        private final Injector injector;

        GuiceFactory(Injector injector) {
            this.injector = injector;
        }

        @Override
        public boolean addClass(Class<?> clazz) {
            return true;
        }

        @Override
        public void start() {
            injector.getInstance(ScenarioScope.class).enterScope();
        }

        @Override
        public void stop() {
            injector.getInstance(ScenarioScope.class).exitScope();
        }

        @Override
        public <T> T getInstance(Class<T> clazz) {
            return injector.getInstance(clazz);
        }
    }
}

 @Retention(RetentionPolicy.RUNTIME)
 @Target({ ElementType.TYPE })
 public @interface GuiceCucumberOptions {

     Class<? extends InjectorSource> injectorSource();

 }

@RunWith(GuiceCucumberRunner.class)
@GuiceCucumberOptions(injectorSource = MyInjector.class)
@CucumberOptions(
        ...
)
public class Suite {

}

我需要复制GuiceFactory，因为它没有公开普通的构造函数(！idspnonenote)。)