Migrate to JUnit5

callback/pom.xml

@@ -34,8 +34,13 @@
   <artifactId>callback</artifactId>
   <dependencies>
     <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-api</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
       <scope>test</scope>
     </dependency>
   </dependencies>

callback/src/test/java/com/iluwatar/callback/AppTest.java

@@ -22,7 +22,7 @@
  */
 package com.iluwatar.callback;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import java.io.IOException;
 

callback/src/test/java/com/iluwatar/callback/CallbackTest.java

@@ -22,9 +22,9 @@
  */
 package com.iluwatar.callback;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 /**
  * Add a field as a counter. Every time the callback method is called increment this field. Unit
@@ -47,15 +47,15 @@ public class CallbackTest {
 
     Task task = new SimpleTask();
 
-    assertEquals("Initial calling count of 0", new Integer(0), callingCount);
+    assertEquals(new Integer(0), callingCount, "Initial calling count of 0");
 
     task.executeWith(callback);
 
-    assertEquals("Callback called once", new Integer(1), callingCount);
+    assertEquals(new Integer(1), callingCount, "Callback called once");
 
     task.executeWith(callback);
 
-    assertEquals("Callback called twice", new Integer(2), callingCount);
+    assertEquals(new Integer(2), callingCount, "Callback called twice");
 
   }
 
@@ -65,15 +65,15 @@ public class CallbackTest {
 
     Task task = new SimpleTask();
 
-    assertEquals("Initial calling count of 0", new Integer(0), callingCount);
+    assertEquals(new Integer(0), callingCount, "Initial calling count of 0");
 
     task.executeWith(callback);
 
-    assertEquals("Callback called once", new Integer(1), callingCount);
+    assertEquals(new Integer(1), callingCount, "Callback called once");
 
     task.executeWith(callback);
 
-    assertEquals("Callback called twice", new Integer(2), callingCount);
+    assertEquals(new Integer(2), callingCount, "Callback called twice");
 
   }
 }