Improve example test script (with failing example)

tests/test_examples.sh

@@ -1,10 +1,17 @@
 #! /bin/bash
 
+failed=0
+
 for example in $(find $1 -maxdepth 1 -name "*.py")
 do
-    echo "test:" $example
-    export DISPLAY= && python $example --fast_dev_run 1
+    echo  -n "$x" $example '... '
+    export DISPLAY= && python $example --fast_dev_run 1 &> /dev/null 
     if [[ $? -ne 0 ]]; then
-        exit 1
+        echo "Failed!!!!"
+        failed=1
+    else
+        echo "Success."
     fi
-done
+done
+
+exit $failed