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Diffstat (limited to 'container-di/src/test/java/demo/FallbackToGuiceInjectorTest.java')
-rw-r--r-- | container-di/src/test/java/demo/FallbackToGuiceInjectorTest.java | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/container-di/src/test/java/demo/FallbackToGuiceInjectorTest.java b/container-di/src/test/java/demo/FallbackToGuiceInjectorTest.java new file mode 100644 index 00000000000..3d5550ab0a3 --- /dev/null +++ b/container-di/src/test/java/demo/FallbackToGuiceInjectorTest.java @@ -0,0 +1,104 @@ +// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root. +package demo; + +import com.google.inject.AbstractModule; +import com.google.inject.Guice; +import com.google.inject.Inject; +import com.google.inject.Injector; +import com.google.inject.name.Named; +import com.google.inject.name.Names; +import com.yahoo.component.AbstractComponent; +import org.junit.Rule; +import org.junit.Test; +import org.junit.rules.ExpectedException; + +import java.util.concurrent.Executor; +import java.util.concurrent.Executors; + +import static org.hamcrest.CoreMatchers.is; +import static org.junit.Assert.assertThat; +import static org.junit.Assert.assertNotNull; + +/** + * @author tonytv + * @author gjoranv + */ +@SuppressWarnings("unused") +public class FallbackToGuiceInjectorTest extends Base { + public static class MyComponent extends AbstractComponent { + private final String url; + private final Executor executor; + + @Inject + public MyComponent(@Named("url") String url, Executor executor) { + this.url = url; + this.executor = executor; + } + + public MyComponent() { + throw new RuntimeException("Constructor annotated with @Inject is preferred."); + } + } + + public static class ComponentTakingDefaultString{ + private final String injectedString; + + public ComponentTakingDefaultString(String empty_string_created_by_guice) { + this.injectedString = empty_string_created_by_guice; + } + } + + public static class ComponentThatCannotBeConstructed { + public ComponentThatCannotBeConstructed(Integer cannot_be_injected_because_Integer_has_no_default_ctor) { } + } + + @Rule + public final ExpectedException exception = ExpectedException.none(); + + @Test + public void guice_injector_is_used_when_no_global_component_exists() { + setInjector( + Guice.createInjector(new AbstractModule() { + @Override + protected void configure() { + bind(Executor.class).toInstance(Executors.newSingleThreadExecutor()); + bind(String.class).annotatedWith(Names.named("url")).toInstance("http://yahoo.com"); + } + })); + + register(MyComponent.class); + complete(); + + MyComponent component = getInstance(MyComponent.class); + assertThat(component.url, is("http://yahoo.com")); + assertNotNull(component.executor); + } + + @Test + public void guice_injector_creates_a_new_instance_with_default_ctor_when_no_explicit_binding_exists() { + setInjector(emptyGuiceInjector()); + register(ComponentTakingDefaultString.class); + complete(); + + ComponentTakingDefaultString component = getInstance(ComponentTakingDefaultString.class); + assertThat(component.injectedString, is("")); + } + + @Test + public void guice_injector_fails_when_no_explicit_binding_exists_and_class_has_no_default_ctor() { + setInjector(emptyGuiceInjector()); + register(ComponentThatCannotBeConstructed.class); + + exception.expect(RuntimeException.class); + exception.expectMessage("When resolving dependencies of 'demo.FallbackToGuiceInjectorTest$ComponentThatCannotBeConstructed'"); + complete(); + } + + private Injector emptyGuiceInjector() { + return Guice.createInjector(new AbstractModule() { + @Override + protected void configure() { + } + }); + } +} |