Improve testing

pom.xml

@@ -84,6 +84,18 @@
                     </instructions>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <configuration>
+                    <systemPropertyVariables>
+                        <log4j.configuration>file:src/test/resources/log4j.properties</log4j.configuration>
+                    </systemPropertyVariables>
+                    <suiteXmlFiles>
+                        <suiteXmlFile>src/test/resources/testng.xml</suiteXmlFile>
+                    </suiteXmlFiles>
+                </configuration>
+            </plugin>
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>

src/test/resources/testng.xml

@@ -0,0 +1,30 @@
+
+<!--
+  ~ Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
+  ~
+  ~ WSO2 Inc. licenses this file to you under the Apache License,
+  ~ Version 2.0 (the "License"); you may not use this file except
+  ~ in compliance with the License.
+  ~ you may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+
+<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
+
+<suite name="JsonExtensionTestSuite">
+    <parameter name="useDefaultListeners" value="false"/>
+
+    <test name="Extension Unit Tests" preserve-order="true">
+        <classes>
+            <class name="org.wso2.extension.siddhi.execution.json.ExtensionTestCase"/>
+        </classes>
+    </test>
+</suite>