Migrate to JUnit5

data-bus/src/test/java/com/iluwatar/databus/DataBusTest.java

@@ -22,8 +22,8 @@
  */
 package com.iluwatar.databus;
 
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
@@ -43,7 +43,7 @@ public class DataBusTest {
   @Mock
   private DataType event;
 
-  @Before
+  @BeforeEach
   public void setUp() {
     MockitoAnnotations.initMocks(this);
   }