Update jest.global-teardown.js

Author: neSpecc

jest.global-teardown.js

@@ -1,9 +1,16 @@
 const process = require('process');
+const mongoTeardown = require('@shelf/jest-mongodb/teardown');
+
+module.exports = async () => {
+  /**
+   * Cleanup MongoDB Memory Server
+   * @shelf/jest-mongodb should handle this automatically, but we try to ensure cleanup
+   */
+  await mongoTeardown();
 
-module.exports = () => {
   if (process.env.CI) {
     setTimeout(() => {
       process.exit(0);
     }, 1000);
   }
-};
+};