only set up spies once

Author: lobsterkatie

packages/tracing/test/hub.test.ts

@@ -16,21 +16,17 @@ addExtensionMethods();
 
 const mathRandom = jest.spyOn(Math, 'random');
 jest.spyOn(Transaction.prototype, 'setMetadata');
+jest.spyOn(logger, 'warn');
+jest.spyOn(logger, 'log');
+jest.spyOn(utilsModule, 'isNodeEnv');
 
 // we have to add things into the real global object (rather than mocking the return value of getGlobalObject) because
 // there are modules which call getGlobalObject as they load, which is seemingly too early for jest to intervene
 addDOMPropertiesToGlobal(['XMLHttpRequest', 'Event', 'location', 'document']);
 
 describe('Hub', () => {
-  beforeEach(() => {
-    jest.spyOn(logger, 'warn');
-    jest.spyOn(logger, 'log');
-    jest.spyOn(utilsModule, 'isNodeEnv');
-  });
-
   afterEach(() => {
     jest.clearAllMocks();
-    jest.useRealTimers();
   });
 
   describe('getTransaction()', () => {