Adds testing safeguard on lib (#3537)

Author: flovilmart

.travis.yml

@@ -12,7 +12,7 @@ addons:
   apt_packages:
   - postgresql-9.5-postgis-2.3
 before_script:
-  - ls -al "$HOME/.mongodb/versions"
+  - node -e 'require("./lib/index.js")'
   - psql -c 'create database parse_server_postgres_adapter_test_database;' -U postgres
   - psql -c 'CREATE EXTENSION postgis;' -U postgres -d parse_server_postgres_adapter_test_database
   - psql -c 'CREATE EXTENSION postgis_topology;' -U postgres -d parse_server_postgres_adapter_test_database