fix: add auth to the command line arguments

Author: StefanoDeVuono

src/util/MongoInstance.js

@@ -77,6 +77,7 @@ export default class MongodbInstance {
     if (storageEngine) result.push('--storageEngine', storageEngine);
     if (dbPath) result.push('--dbpath', dbPath);
     if (!auth) result.push('--noauth');
+    else if (auth) result.push('--auth');
     if (replSet) result.push('--replSet', replSet);
 
     return result.concat(args || []);

src/util/__tests__/MongoInstance-test.js

@@ -73,6 +73,7 @@ describe('MongoInstance', () => {
       '27555',
       '--dbpath',
       '/data',
+      '--auth',
     ]);
   });