Adding jUnits for test article: Different Types of Bean Injection in Spring

spring-core/src/main/java/com/baeldung/dependencyinjectiontypes/ArticleFormatter.java

@@ -8,7 +8,7 @@ public class ArticleFormatter {
     @SuppressWarnings("resource")
     public static void main(String[] args) {    	
         ApplicationContext context = new ClassPathXmlApplicationContext("dependencyinjectiontypes-context.xml");
-        Article article = (Article) context.getBean("articleBean");
+        ArticleWithSetterInjection article = (ArticleWithSetterInjection) context.getBean("articleWithSetterInjectionBean");
         String formattedArticle = article.format("This is a text !");
         
         System.out.print(formattedArticle);

spring-core/src/main/java/com/baeldung/dependencyinjectiontypes/ArticleWithConstructorInjection.java

@@ -0,0 +1,17 @@
+package com.baeldung.dependencyinjectiontypes;
+
+import org.springframework.beans.factory.annotation.Autowired;
+
+public class ArticleWithConstructorInjection {
+
+	private TextFormatter formatter;
+
+	@Autowired
+    public ArticleWithConstructorInjection(TextFormatter formatter) {
+        this.formatter = formatter;
+    }
+
+    public String format(String text) {
+        return formatter.format(text);
+    }
+}

spring-core/src/main/java/com/baeldung/dependencyinjectiontypes/ArticleWithSetterInjection.java

@@ -2,11 +2,11 @@ package com.baeldung.dependencyinjectiontypes;
 
 import org.springframework.beans.factory.annotation.Autowired;
 
-public class Article {
+public class ArticleWithSetterInjection {
 
     private TextFormatter formatter;
 
-    public Article(TextFormatter formatter) {
+    public ArticleWithSetterInjection(TextFormatter formatter) {
         this.formatter = formatter;
     }
 

spring-core/src/main/resources/dependencyinjectiontypes-context.xml

@@ -6,11 +6,18 @@
    
    <context:annotation-config/>
 
-	<bean id="articleBean"
-		class="com.baeldung.dependencyinjectiontypes.Article">
+	<bean id="articleWithSetterInjectionBean"
+		class="com.baeldung.dependencyinjectiontypes.ArticleWithSetterInjection">
 		<constructor-arg ref="textFormatterBean" />
 	</bean>
 	
+	<bean id="articleWithConstructorInjectionBean"
+		class="com.baeldung.dependencyinjectiontypes.ArticleWithConstructorInjection">
+		<constructor-arg ref="textFormatterBean" />
+	</bean>
+	
+	
 	<bean id="textFormatterBean" class="com.baeldung.dependencyinjectiontypes.TextFormatter">
 	</bean>
+	
 </beans>

spring-core/src/test/java/com/baeldung/dependencyinjectiontypes/DependencyInjectionTest.java

@@ -0,0 +1,35 @@
+package com.baeldung.dependencyinjectiontypes;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+public class DependencyInjectionTest {
+
+    @Test
+    public void givenAutowiredAnnotation_WhenSetOnSetter_ThenDependencyValid() {
+        
+    	ApplicationContext context = new ClassPathXmlApplicationContext("dependencyinjectiontypes-context.xml");
+    	ArticleWithSetterInjection article = (ArticleWithSetterInjection) context.getBean("articleWithSetterInjectionBean");
+        
+    	String originalText = "This is a text !";
+    	String formattedArticle = article.format(originalText);
+    	
+    	assertTrue(originalText.toUpperCase().equals(formattedArticle));
+    }
+    
+    @Test
+    public void givenAutowiredAnnotation_WhenSetOnConstructor_ThenDependencyValid() {
+    	
+    	ApplicationContext context = new ClassPathXmlApplicationContext("dependencyinjectiontypes-context.xml");
+    	ArticleWithConstructorInjection article = (ArticleWithConstructorInjection) context.getBean("articleWithConstructorInjectionBean");
+        
+    	String originalText = "This is a text !";
+    	String formattedArticle = article.format(originalText);
+    	
+    	assertTrue(originalText.toUpperCase().equals(formattedArticle));
+    }
+    
+}