Migrated attachment for Guice issue 791, comment 0

GuiceTest.java

import static org.junit.Assert.assertTrue;

import java.util.Set;

import com.google.inject.AbstractModule;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Singleton;
import com.google.inject.TypeLiteral;
import com.google.inject.multibindings.Multibinder;
import org.junit.Test;

public class GuiceTest {

	private static interface A {

	}

	private static class B implements A {

	}

	@Singleton
	private static class C implements A {

	}

	private final Injector inj = Guice.createInjector(new AbstractModule() {
		@Override
		protected void configure() {
			Multibinder<A> binder = Multibinder.newSetBinder(binder(), A.class);

			binder.addBinding().to(B.class).in(Singleton.class);
			binder.addBinding().to(C.class);
		}
	});

	@Test
	public void getInstance_ofB_IsIdentical() {
		assertTrue(inj.getInstance(B.class) == inj.getInstance(B.class));
	}

	@Test
	public void getInstance_ofC_IsIdentical() {
		assertTrue(inj.getInstance(C.class) == inj.getInstance(C.class));
	}

	@Test
	public void getInstance_ofSet_ContainsB() {
		assertTrue(inj.getInstance(Key.get(new TypeLiteral<Set<A>>() {
		})).contains(inj.getInstance(B.class)));
	}

	@Test
	public void getInstance_ofSet_ContainsC() {
		assertTrue(inj.getInstance(Key.get(new TypeLiteral<Set<A>>() {
		})).contains(inj.getInstance(C.class)));
	}


}