Adding TestNG dependency for our assertion library

Author: angiejones

webdriver_java/pom.xml

@@ -19,6 +19,14 @@
             <artifactId>selenium-chrome-driver</artifactId>
             <version>3.141.59</version>
         </dependency>
+
+        <dependency>
+            <groupId>org.testng</groupId>
+            <artifactId>testng</artifactId>
+            <version>6.14.3</version>
+            <scope>test</scope>
+        </dependency>
+
     </dependencies>
 
 </project>