remove unnecessary test

Author: PavelSafronov

test/unit/utils.test.ts

@@ -21,7 +21,6 @@ import {
   List,
   MongoDBCollectionNamespace,
   MongoDBNamespace,
-  now,
   shuffle
 } from '../../src/utils';
 import { sleep } from '../tools/utils';
@@ -1286,15 +1285,4 @@ describe('driver utils', function () {
       });
     });
   });
-
-  describe('now()', () => {
-    it('difference between two calls is close to sleep time', async () => {
-      const time1 = now();
-      await sleep(10);
-      const time2 = now();
-      const diff = time2 - time1;
-      expect(diff).to.be.gte(5);
-      expect(diff).to.be.lte(15);
-    });
-  });
 });