Class OverrideModuleTest

core/test/com/google/inject/util/OverrideModuleTest.java:57–854

@author sberlin@gmail.com (Sam Berlin)

/** @author sberlin@gmail.com (Sam Berlin) */
public class OverrideModuleTest extends TestCase {

  private static final Key<String> key2 = Key.get(String.class, named("2"));
  private static final Key<String> key3 = Key.get(String.class, named("3"));

  private static final Module EMPTY_MODULE =
      new Module() {
        @Override
        public void configure(Binder binder) {}
      };

  public void testOverride() {
    Injector injector = createInjector(Modules.override(newModule("A")).with(newModule("B")));
    assertEquals("B", injector.getInstance(String.class));
  }

  public void testOverrideMultiple() {
    Module module =
        Modules.override(newModule("A"), newModule(1), newModule(0.5f))
            .with(newModule("B"), newModule(2), newModule(1.5d));
    Injector injector = createInjector(module);
    assertEquals("B", injector.getInstance(String.class));
    assertEquals(2, injector.getInstance(Integer.class).intValue());
    assertEquals(0.5f, injector.getInstance(Float.class), 0.0f);
    assertEquals(1.5d, injector.getInstance(Double.class), 0.0);
  }

  public void testOverrideUnmatchedTolerated() {
    Injector injector = createInjector(Modules.override(EMPTY_MODULE).with(newModule("B")));
    assertEquals("B", injector.getInstance(String.class));
  }

  public void testOverrideConstant() {
    Module original =
        new AbstractModule() {
          @Override
          protected void configure() {
            bindConstant().annotatedWith(named("Test")).to("A");
          }
        };

    Module replacements =
        new AbstractModule() {
          @Override
          protected void configure() {
            bindConstant().annotatedWith(named("Test")).to("B");
          }
        };

    Injector injector = createInjector(Modules.override(original).with(replacements));
    assertEquals("B", injector.getInstance(Key.get(String.class, named("Test"))));
  }

  public void testGetProviderInModule() {
    Module original =
        new AbstractModule() {
          @Override
          protected void configure() {