Guice測試是否已創建類

Question

我想測試在測試方法期間是否從注入器創建了對象的實例。 實現此目標的最佳解決方案是什么。

@Test
public void testThingNotInstantiated() {
    AnotherThing another = new AnotherThing(); 
    // assert not instance of Thing created
}

Answer 1

如果您只想檢查Guice是否注入了AnotherThing ，則可以編寫：

Injector injector

@Before {
    injector = Guice.createInjector(new AnotherThingModule());
}

@Test
public void testAnotherThingInstantiated() {
    //act
    AnotherThing another = injector.getInstance(AnotherThing.class);

    //assert
    assertNotNull(another);
}

如果AnotherThing是@Singleton ，你想測試吉斯不會實例兩次，你可以這樣寫：

@Test
public void testSingletonAnotherThingNotInstantiatedTwiceByInjector() {
    //act
    AnotherThing first = injector.getInstance(AnotherThing.class);
    AnotherThing second = injector.getInstance(AnotherThing.class);

    //assert
    assertSame(first, second);
}