Fix docker inspect command syntax in test script

Author: kriscfoster

docker_compose_test/docker_compose_test.sh

@@ -72,7 +72,7 @@ echo "$docker_compose_up_cmd" | bash
 result=$?
 
 # Figure out the exit code of the test container incase it never actually started.
-EXIT_CODE=$(docker inspect $($docker_compose_bin -f $ABSOLUTE_COMPOSE_FILE_PATH ps -qa $DOCKER_COMPOSE_TEST_CONTAINER) --format='{{.State.ExitCode}}' 2>/dev/null)
+EXIT_CODE=$(docker inspect $("$docker_compose_bin" -f "$ABSOLUTE_COMPOSE_FILE_PATH" ps -qa "$DOCKER_COMPOSE_TEST_CONTAINER") --format='{{.State.ExitCode}}' 2>/dev/null)
 if [ "$EXIT_CODE" != "0" ] || [ -z "$EXIT_CODE" ]; then
   echo "Error: $DOCKER_COMPOSE_TEST_CONTAINER container failed or never started!"
   exit 1