I'm testing a koa server. The `verifyRequest' is a middleware which calls http request internally, so I want to mock the function and test that the function is called properly.

The first time I run the mock function, toBeCalled returns true as expected. However, after executing mockClear, toBeCalled returns false, even though the mock function is executed (please see the logs below).

Can anyone explain the curious behavior? And please let me know how I can run mock clear correctly.

// server.test.ts

import {verifyRequest} from '../middlewares/verifyRequest';
import {mocked} from 'jest-mock';
import {agent} from './lib/agent';

jest.mock('../middlewares/verifyRequest', () => {
  return {
    verifyRequest: jest.fn().mockImplementation(
      (): Middleware<DefaultState, Context, any> => {
        return async function (_ctx, next) {
          console.log('mocked verifyRequest is called!');
          await next();
        };
      }
    ),
  };
});

afterEach(() => {
  mocked(verifyRequest).mockClear();
});

it('test-one', async () => {
  await agent.get('/'); // verifyRequest will be called as a middleware
  console.log('test-one', mocked(verifyRequest).mock);
  expect(verifyRequest).toBeCalled();
});
it('test-two', async () => {
  await agent.get('/');
  console.log('test-two', mocked(verifyRequest).mock);
  expect(verifyRequest).toBeCalled();
});

// ../middlewares/verifyRequest
import compose from 'koa-compose';
import {Context, DefaultState, Middleware} from 'koa';

export function verifyRequest(): Middleware<DefaultState, Context, any> {
  return compose([
    ...myMiddlwares
  ]);
}

    console.log
      mocked verifyRequest is called!

    console.log
      test-one {
        calls: [ [ [Object] ], [ [Object] ], [ [Object] ], [ [Object] ] ],
        instances: [ undefined, undefined, undefined, undefined ],
        invocationCallOrder: [ 5, 6, 9, 10 ],
        results: [
          { type: 'return', value: [AsyncFunction (anonymous)] },
          { type: 'return', value: [AsyncFunction (anonymous)] },
          { type: 'return', value: [AsyncFunction (anonymous)] },
          { type: 'return', value: [AsyncFunction (anonymous)] }
        ]
      }

    console.log
      mocked verifyRequest is called!

    console.log
      test-two { calls: [], instances: [], invocationCallOrder: [], results: [] }

versions
"jest": "^27.4.7",
"jest-mock": "^27.4.6",
"ts-jest": "^27.1.3",