CODEWITHSUNDEEP
javaunit-testingsingletonguice
user3044240
user3044240

Reputation: 621

How to call a non static public method from a Singleton class which is using Google @Inject

I have a Singleton class that I want to test. It uses a @Inject annotation for that class's contructor. Now for testing I want to call a public method for that class in my test class but unable to do so. I have mocked an object that is getting passed to the constructor.

@Inject
    private SomeClass(SomeOtherClassObject obj) {
        super(obj);
    }

I mocked the above private constructor in the following way:

Singleton mockSingleton = PowerMock.createMock(Singleton.class);
        PowerMock.expectNew(Singleton.class).andReturn(mockSingleton);

I dont understand how do I call the following method

public SomeClass someMethod(int 1, String 2){

//some logic

return (Object of SomeClass)
}

Any help will be appreciated. Thank You.

Upvotes: 1

Views: 169

Answers (1)

Jan Galinski
Jan Galinski

Reputation: 11993

If you are using guice as well, you can provide a module in your test that binds SomeOtherClassObject to your mock instance. Then create the SomeClass instance via Guice's injector.

@Test
public void test() {
  SomeOtherClassObject other = ...; // what ever you need to create the Mock
  Injector injector = Guice.createInjector(new AbstractModule(){
    public void configure() {
      bind(SomeOtherClassObject.class)toInstance(other);
    }
   });
   SomeClass some = injector.getInstance(SomeClass.class); // guice takes care of the constructor injection
   some.someMethod(...);
  }

If you dont use guice, have a look at needle4j. Its a test-support lib that automatically injects mocks when injection is required. But it works only with easymock or mockito.

Upvotes: 1

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