Class NullabilityTest

javatests/dagger/functional/nullables/NullabilityTest.java:27–112

import org.junit.runners.JUnit4;

@RunWith(JUnit4.class)
public class NullabilityTest {
  @Test public void testNullability_provides() {
    NullModule module = new NullModule();
    NullComponent component = DaggerNullComponent.builder().nullModule(module).build();

    // Can't construct NullFoo because it depends on Number, and Number was null.
    try {
      component.nullFoo();
      fail();
    } catch (NullPointerException npe) {
      assertThat(npe).hasMessage("Cannot return null from a non-@Nullable @Provides method");
    }

    // set number to non-null so we can create
    module.numberValue = 1;
    NullFoo nullFoo = component.nullFoo();

    // Then set it back to null so we can test its providers.
    module.numberValue = null;
    validate(true, nullFoo.string, nullFoo.stringProvider, nullFoo.numberProvider);
    validate(true, nullFoo.methodInjectedString, nullFoo.methodInjectedStringProvider,
        nullFoo.methodInjectedNumberProvider);
    validate(true, nullFoo.fieldInjectedString, nullFoo.fieldInjectedStringProvider,
        nullFoo.fieldInjectedNumberProvider);
  }
  
  @Test public void testNullability_components() {
    NullComponent nullComponent = new NullComponent() {      
      @Override public Provider<String> stringProvider() {
        return new Provider<String>() {
          @Override public String get() {
            return null;
          }
        };
      }
      
      @Override public String string() {
        return null;
      }
      
      @Override public Provider<Number> numberProvider() {
        return new Provider<Number>() {
          @Override public Number get() {
            return null;
          }
        };
      }
      
      @Override public Number number() {
        return null;
      }
      
      @Override public NullFoo nullFoo() {
        return null;
      }
    };
    NullComponentWithDependency component =