fix(MongoMemoryServer): change state to stopped when start fails

Author: Idan Attias

packages/mongodb-memory-server-core/src/MongoMemoryServer.ts

@@ -277,6 +277,8 @@ export class MongoMemoryServer extends EventEmitter {
         console.warn('Starting the instance failed, enable debug for more information');
       }
 
+      this.stateChange(MongoMemoryServerStates.stopped);
+
       throw err;
     });
 

packages/mongodb-memory-server-core/src/__tests__/MongoMemoryServer.test.ts

@@ -63,6 +63,7 @@ describe('MongoMemoryServer', () => {
 
       await expect(mongoServer.start()).rejects.toThrow('unknown error');
 
+      expect(mongoServer.state).toStrictEqual(MongoMemoryServerStates.stopped);
       expect(mongoServer._startUpInstance).toHaveBeenCalledTimes(1);
       expect(console.warn).toHaveBeenCalledTimes(1);
     });