Allow Named Guice components to be used in Spring when using partial injection.

src/test/java/org/springframework/guice/PartialInjectionTests.java

@@ -0,0 +1,154 @@
+/*
+ * Copyright 2013-2014 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.guice;
+
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import com.google.inject.AbstractModule;
+import com.google.inject.Guice;
+import com.google.inject.Injector;
+import com.google.inject.Provides;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.guice.module.BeanFactoryProvider;
+import org.springframework.guice.module.SpringModule;
+import org.springframework.stereotype.Component;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class PartialInjectionTests {
+
+	@Test
+	void shouldResolveNamedComponentsInSpringWhenUsingSetterInjection() {
+		Injector injector = guiceInjectorWithSpringBean(SetterInjectionExample.class);
+
+		SetterInjectionExample example = injector.getInstance(SetterInjectionExample.class);
+
+		assertThat(example.getNamedMessage()).isEqualTo("banana");
+	}
+
+	@Test
+	void shouldResolveNamedComponentsInSpringWhenUsingConstructorInjection() {
+		Injector injector = guiceInjectorWithSpringBean(ConstructorInjectionExample.class);
+
+		ConstructorInjectionExample example = injector.getInstance(ConstructorInjectionExample.class);
+
+		assertThat(example.getNamedMessage()).isEqualTo("banana");
+	}
+
+	@Test
+	void shouldResolveComponentsInSpringWhenUsingSetterInjection() {
+		Injector injector = guiceInjectorWithSpringBean(SetterInjectionExample.class);
+
+		SetterInjectionExample example = injector.getInstance(SetterInjectionExample.class);
+
+		assertThat(example.getUnnamedMessage()).isEqualTo("apple");
+	}
+
+	@Test
+	void shouldResolveComponentsInSpringWhenUsingConstructorInjection() {
+		Injector injector = guiceInjectorWithSpringBean(ConstructorInjectionExample.class);
+
+		ConstructorInjectionExample example = injector.getInstance(ConstructorInjectionExample.class);
+
+		assertThat(example.getUnnamedMessage()).isEqualTo("apple");
+	}
+
+	private Injector guiceInjectorWithSpringBean(Class<?> classForContext) {
+		Class<?>[] components = new Class<?>[] { classForContext };
+		BeanFactoryProvider beanFactoryProvider = BeanFactoryProvider.from(components);
+		return Guice.createInjector(new SpringModule(beanFactoryProvider), new ExampleGuiceModule());
+	}
+
+	@Component
+	public static class SetterInjectionExample {
+
+		@Autowired
+		@Qualifier("named")
+		private Dependency named;
+
+		@Autowired
+		private Dependency unnamed;
+
+		public String getNamedMessage() {
+			return this.named.getMessage();
+		}
+
+		public String getUnnamedMessage() {
+			return this.unnamed.getMessage();
+		}
+
+	}
+
+	@Component
+	public static class ConstructorInjectionExample {
+
+		private final Dependency named;
+
+		private final Dependency unnamed;
+
+		@Autowired
+		public ConstructorInjectionExample(@Qualifier("named") Dependency named, Dependency unnamed) {
+			this.named = named;
+			this.unnamed = unnamed;
+		}
+
+		public String getNamedMessage() {
+			return this.named.getMessage();
+		}
+
+		public String getUnnamedMessage() {
+			return this.unnamed.getMessage();
+		}
+
+	}
+
+	public static class ExampleGuiceModule extends AbstractModule {
+
+		@Provides
+		@Singleton
+		@Named("named")
+		public Dependency namedDependencyProvider() {
+			return new Dependency("banana");
+		}
+
+		@Provides
+		@Singleton
+		public Dependency unnamedDependencyProvider() {
+			return new Dependency("apple");
+		}
+
+	}
+
+	public static class Dependency {
+
+		private final String message;
+
+		public Dependency(String message) {
+			this.message = message;
+		}
+
+		public String getMessage() {
+			return this.message;
+		}
+
+	}
+
+}