diff --git a/.gitignore b/.gitignore
index d661493..c5221dd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,7 @@ hs_err_pid*.log
 rapport/
 !rapport/rapport.tex
 !rapport/pics/*.png
+!rapport/pics/*.PNG
 !rapport/pics/*.jpg
 
 # javadoc files
@@ -26,4 +27,4 @@ build/
 
 # tests files
 
-result.txt
\ No newline at end of file
+test*.txt
\ No newline at end of file
diff --git a/build.xml b/build.xml
index fb82d50..1b655db 100644
--- a/build.xml
+++ b/build.xml
@@ -58,7 +58,8 @@
         <junit printsummary="true" haltonerror="no" haltonfailure="no" showoutput="true">
             <classpath refid="project.classpath"/>
             <formatter type="plain"/>
-            <test fork="true" name="lsystem.TestLSystem" outfile="result" />
+            <test fork="true" name="lsystem.TestLSystem" outfile="test1" />
+            <test fork="true" name="lsystem.StressTest" outfile="test2" />
         </junit>
     </target>
 </project>
\ No newline at end of file
diff --git a/src/lsystem/engine/Rewrite.java b/src/lsystem/engine/Rewrite.java
index c85be8d..fe1454a 100644
--- a/src/lsystem/engine/Rewrite.java
+++ b/src/lsystem/engine/Rewrite.java
@@ -55,7 +55,7 @@ public class Rewrite {
             System.out.println(i + " / " + recurrences + " : " + rewritten.length());
         }
         rewritten = rewritten.replace("[", "Y[");
-        System.out.println(rewritten);
+        // System.out.println(rewritten);
         return rewritten;
     }
 
diff --git a/test/lsystem/StressTest.java b/test/lsystem/StressTest.java
new file mode 100644
index 0000000..1c86829
--- /dev/null
+++ b/test/lsystem/StressTest.java
@@ -0,0 +1,30 @@
+package lsystem;
+
+import lsystem.engine.Parser;
+import lsystem.screen.gl3d.GLCanvas;
+import lsystem.utils.Pair;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.assertNotNull;
+
+public class StressTest {
+
+    /**
+     * require at least 1GB of free ram
+     */
+    @Test
+    public void stressTest1() {
+        long millis = System.currentTimeMillis();
+        GLCanvas joglFrame = new GLCanvas();
+        Parser parser = new Parser("Y", Arrays.asList("Y=X+[[Y]-Y]-X[-XY]+Y", "X=XX"), 12);
+        List<Pair<String, String>> lSystemRules = parser.parseRules();
+        joglFrame.setLSystem(parser.getAxiom(), lSystemRules, parser.getNbIterations());
+        System.out.println(joglFrame.getLSystem());
+        System.out.println("time in millisecondes: " + (System.currentTimeMillis() - millis));
+        assertNotNull("L-System should not be null", joglFrame.getLSystem());
+    }
+
+}