fix tests

Author: AbhiPrasad

packages/core/test/lib/base.test.ts

@@ -1804,7 +1804,7 @@ describe('BaseClient', () => {
 
       expect(mockSend).toBeCalledTimes(1);
       expect(callback).toBeCalledTimes(1);
-      expect(callback).toBeCalledWith(errorEvent, undefined);
+      expect(callback).toBeCalledWith(errorEvent, 'send error');
     });
 
     it('passes the response to the hook', async () => {

packages/core/test/lib/transports/base.test.ts

@@ -35,7 +35,7 @@ const transportOptions = {
 
 describe('createTransport', () => {
   it('flushes the buffer', async () => {
-    const mockBuffer: PromiseBuffer<void> = {
+    const mockBuffer: PromiseBuffer<TransportMakeRequestResponse> = {
       $: [],
       add: jest.fn(),
       drain: jest.fn(),