--- a/stress-tester/src/test/java/com/passus/st/client/http/extractor/RegexValueExtractorTest.java	Thu Aug 17 14:33:32 2017 +0200
+++ b/stress-tester/src/test/java/com/passus/st/client/http/extractor/RegexValueExtractorTest.java	Thu Aug 17 14:56:18 2017 +0200
@@ -35,6 +35,15 @@
         assertEquals(null, extract("no_such_pattern(.*?)", content));
     }
 
+    @Test
+    public void testInvalidRegex() {
+        try {
+            RegexValueExtractor e = new RegexValueExtractor("(((");
+            fail("should throw exception");
+        } catch (Exception ignore) {
+        }
+    }
+
     static String extract(String regex, String content) {
         return new RegexValueExtractor(regex).extract(content);
     }

--- a/stress-tester/src/test/java/com/passus/st/client/http/extractor/XmlValueExtractorTest.java	Thu Aug 17 14:33:32 2017 +0200
+++ b/stress-tester/src/test/java/com/passus/st/client/http/extractor/XmlValueExtractorTest.java	Thu Aug 17 14:56:18 2017 +0200
@@ -1,7 +1,7 @@
 package com.passus.st.client.http.extractor;
 
 import com.passus.st.Log4jConfigurationFactory;
-import static org.testng.AssertJUnit.assertEquals;
+import static org.testng.AssertJUnit.*;
 import org.testng.annotations.Test;
 
 /**
@@ -26,7 +26,7 @@
         assertEquals("value2", extract("/root/node2", xml));
         assertEquals("value3", extract("/root/node2[2]", xml));
         assertEquals("", extract("/root/emptyNode", xml));
-        
+
         assertEquals("", extract("/root/noSuchNode", xml));
         assertEquals("", extract("/root/node1/@noSuchAttribute", xml));
         assertEquals(null, extract("/root/node1", "NOT AN XML"));
@@ -34,8 +34,16 @@
         // TODO: sprawdzić zachowanie i wydajność Apache JXPath
     }
 
+    @Test
+    public void testInvalidXPath() {
+        try {
+            XmlValueExtractor e = new XmlValueExtractor("not a path");
+            fail("should throw exception");
+        } catch (Exception ignore) {
+        }
+    }
+
     static String extract(String path, String content) throws Exception {
-        System.out.println(path);
         return new XmlValueExtractor(path).extract(content);
     }
 }