Merge pull request #10560 from vishal1023/origin/BAEL-4785

Origin/bael 4785

spring-core-5/src/test/java/com/baeldung/springbean/naming/SpringBeanNamingUnitTest.java

@@ -0,0 +1,65 @@
+package com.baeldung.springbean.naming;
+
+import com.baeldung.springbean.naming.component.Cat;
+import com.baeldung.springbean.naming.component.Dog;
+import com.baeldung.springbean.naming.service.PetShow;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+@ExtendWith(SpringExtension.class)
+public class SpringBeanNamingUnitTest {
+
+    private AnnotationConfigApplicationContext context;
+
+    @BeforeEach
+    void setUp() {
+        context = new AnnotationConfigApplicationContext();
+        context.scan("com.baeldung.springbean.naming");
+        context.refresh();
+    }
+
+    // To name a bean spring gets the class name and converts the first letter to lowercase.
+    // Default naming strategy of the spring bean which is using class level annotation
+
+    @Test
+    void givenLoggingServiceBeanIsCreated_whenThereIsNoValueProvided_thenBeanNameShouldBeDefaultName() {
+        assertNotNull(context.getBean("loggingService"));
+    }
+
+    // In this case, to name a bean spring gets the class name and converts the first letter to lowercase.
+    @Test
+    void givenAuditServiceBeanIsCreatedWithMethodLevelAnnotation_whenThereIsNoValueProvided_thenBeanNameShouldBeTheNameOfMethod() {
+        assertNotNull(context.getBean("audit"));
+    }
+
+    // spring will create the bean of type CustomComponent with the name "myBean".
+    // As we're explicitly giving the name to the bean, spring will use this name to refer to it.
+    @Test
+    void givenCustomComponentBeanIsCreate_whenThereIsCustomNameGivenToBean_thenBeanShouldBeIdentifiedByThatName() {
+        assertNotNull(context.getBean("myBean"));
+    }
+
+    @Test
+    void givenCustomComponentBeanIsCreated_whenCustomNameIsGivenOnMethodLevelAnnotation_thenBeanShouldBeIdentifiedByThatName() {
+        assertNotNull(context.getBean("beanComponent"));
+        assertNotNull(context.getBean("configuration"));
+        assertNotNull(context.getBean("qualifierComponent"));
+    }
+
+    @Test
+    void givenMultipleImplementationsOfAnimal_whenFieldIsInjectedWithQualifiedName_thenTheSpecificBeanShouldGetInjected() {
+        PetShow petShow = (PetShow) context.getBean("petShow");
+
+        assertNotNull(context.getBean("cat"));
+        assertNotNull(context.getBean("dog"));
+
+        assertThat(petShow.getCat().getClass()).isEqualTo(Cat.class);
+        assertThat(petShow.getDog().getClass()).isEqualTo(Dog.class);
+    }
+}