iluwatar#467 data-bus: pom.xml: add mockito dependency

Author: kemitix

data-bus/pom.xml

@@ -42,5 +42,10 @@
             <artifactId>junit</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>