diff --git a/tests/configs/empty.conf b/tests/configs/empty.conf
new file mode 100644
index 0000000..e69de29
diff --git a/tests/run_one_test.sh b/tests/run_one_test.sh
index 978f158..5861462 100755
--- a/tests/run_one_test.sh
+++ b/tests/run_one_test.sh
@@ -1,16 +1,18 @@
 #!/bin/sh
+set -x
 if [ -z $DISPLAY ]; then
-	exec xvfb-run -s "+extension composite" -a $0 $1 $2
+	exec xvfb-run -s "+extension composite" -a $0 $1 $2 $3
 fi
 
 echo "Running test $2"
 
 # TODO keep the log file, and parse it to see if test is successful
-($1 --experimental-backends --backend dummy --log-level=debug --log-file=$PWD/log) &
+($1 --experimental-backends --backend dummy --log-level=debug --log-file=$PWD/log --config=$2) &
 compton_pid=$!
-$2
+$3
 
 kill -INT $compton_pid
+wait $compton_pid
 cat log
 rm log
 
diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index cc2ab68..8c84b53 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -2,4 +2,4 @@
 compton=$(realpath $1)
 cd $(dirname $0)
 
-./run_one_test.sh $compton testcases/basic.py
+./run_one_test.sh $compton configs/empty.conf testcases/basic.py