Address some warnings in maven execution

websocket-resources/pom.xml

@@ -101,6 +101,23 @@
       <artifactId>junit-jupiter</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-core</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <configuration>
+          <argLine>-javaagent:${org.mockito:mockito-core:jar}</argLine>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+
 </project>