Add system-rules library in Synapse core module pom
diff --git a/modules/core/pom.xml b/modules/core/pom.xml
index 2eab891..920f640 100644
--- a/modules/core/pom.xml
+++ b/modules/core/pom.xml
@@ -318,5 +318,13 @@
             <artifactId>xercesImpl</artifactId>
 	        <scope>test</scope>
         </dependency>
+
+        <!-- System Rules for unit testing -->
+        <dependency>
+            <groupId>com.github.stefanbirkner</groupId>
+            <artifactId>system-rules</artifactId>
+            <version>1.19.0</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>