diff --git a/tests/debug-config.json b/tests/debug-config.json
new file mode 100644
index 0000000..ae04974
--- /dev/null
+++ b/tests/debug-config.json
@@ -0,0 +1,14 @@
+{
+  "randomSeed" : 20,
+  "port" : 8888,
+  "captchaExpiryTimeLimit" : 5,
+  "throttle" : 10,
+  "threadDelay" : 2,
+  "captchas" : [ {
+    "name" : "DebugCaptcha",
+    "allowedLevels" : [ "debug" ],
+    "allowedMedia" : [ "image/png" ],
+    "allowedInputType" : [ "text" ],
+    "config" : { }
+  }]
+}
diff --git a/tests/run.sh b/tests/run.sh
index b00e7fa..9a07c97 100755
--- a/tests/run.sh
+++ b/tests/run.sh
@@ -11,13 +11,23 @@ locust --headless -u 300 -r 100 --run-time 4m --stop-timeout 30 -f tests/locustf
 status=$?
 
 if [ $status != 0 ]; then
-  kill $JAVA_PID
   exit $status
 fi
 
+kill $JAVA_PID
+sleep 4
+
 echo Run functional test
+cp data/config.json data/config.json.bak
+cp tests/debug-config.json data/config.json
+
+java -jar target/scala-2.13/LibreCaptcha.jar &
+JAVA_PID=$!
+sleep 4
+
 locust --headless -u 1 -r 1 --run-time 1m --stop-timeout 30 -f tests/locustfile-functional.py
 status=$?
+mv data/config.json.bak data/config.json
 
 kill $JAVA_PID
 exit $status