diff --git a/pom.xml b/pom.xml
index 2d3da56..6298e3d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -68,6 +68,11 @@
 						</dependency>
 					</dependencies>
 				</plugin>
+				<plugin>
+					<groupId>org.pitest</groupId>
+					<artifactId>pitest-maven</artifactId>
+					<version>1.4.3</version>
+				</plugin>
 			</plugins>
 		</pluginManagement>
 	</build>
@@ -78,6 +83,10 @@
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-pmd-plugin</artifactId>
 			</plugin>
+			<plugin>
+				<groupId>org.pitest</groupId>
+				<artifactId>pitest-maven</artifactId>
+			</plugin>
 		</plugins>
 	</reporting>
 </project>
\ No newline at end of file
diff --git a/src/test/resources/org/taHjaj/wo/pmdplus/dup/xml/Dup.xml b/src/test/resources/org/taHjaj/wo/pmdplus/dup/xml/Dup.xml
index 05f5612..98646fe 100644
--- a/src/test/resources/org/taHjaj/wo/pmdplus/dup/xml/Dup.xml
+++ b/src/test/resources/org/taHjaj/wo/pmdplus/dup/xml/Dup.xml
@@ -172,6 +172,25 @@ class X {
         x();
         return "done";
     }
+}
+     ]]></code>
+    </test-code>
+    <test-code>
+        <description><![CDATA[
+adding a string to a list twice
+     ]]></description>
+        <expected-problems>0</expected-problems>
+        <code><![CDATA[
+import java.util.ArrayList;
+import java.util.List;
+
+public class PmdPlusTest {
+    private List<String> x = new ArrayList<>();
+    
+    public void test() {
+        x.add( "a");
+        x.add( "a");
+    }
 }
      ]]></code>
     </test-code>