How to create mock function and have good coverage - node.js

Question

I am finding it difficult to have code coverage and mocking request and few functions
cf.service.ts
import { omit } from "lodash";
var request = require('request');
const callForwardConfig = require('../../config/callForwardConfig').callForwardConfig;
import logger from "../../utils/logger";
import { SetCallforwardAs } from '../../interfaces/callforward.interface';
export async function appSerGetCallForwardingState(sid: string, token: string) {
try {
return await callForwardApiCall(sid, token).then((res) => {
return res;
})
} catch (e: any) {
throw new Error(e);
}
}
function callForwardApiCall(sid: string, token: string) {
let callforwardUrl = callForwardConfig.url.as;
return new Promise((resolve, reject) => {
request(`${callforwardUrl}?userId=${sid}`, {
method: 'get',
strictSSL: false,
mode: 'no-cors',
json: true,
headers: { 'Content-Type': 'application/json', Authorization: token},
}, (err: any, response: any, body: any) => {
if (err) {
reject(JSON.stringify(err))
} else {
resolve(body);
}
})
});
}
export async function putAppserCallForward(token: string, callForwardObj: SetCallforwardAs) {
return await updateCallForwardAs(token, callForwardObj).then((res) => {
return res;
})
}
async function updateCallForwardAs(token: string, callForwardObj: SetCallforwardAs) {
let callforwardUrl = callForwardConfig.url.as;
return await new Promise((resolve, reject) => {
let body = {
clusters: callForwardObj.clusters,
name: callForwardObj.name,
destination: callForwardObj.destination,
user: callForwardObj.user
}
logger.info(`App server update cfwrd Request object - ${JSON.stringify(body)}`)
request(`${callforwardUrl}`, {
method: 'put',
strictSSL: false,
mode: 'no-cors',
json: true,
body: body,
headers: { 'Content-Type': 'application/json', Authorization: token},
}, (err: any, response: any, body: any) => {
if (err) {
logger.error(`App server call forward update failure USER - ${callForwardObj.sid}`, JSON.stringify(err));
reject(JSON.stringify(err));
} else {
if (!body['success'])
logger.error(`App server call forward update failure USER - ${callForwardObj.sid} - Error - ${JSON.stringify(body)}`);
else
logger.info(`App server call forward update success USER - ${callForwardObj.sid}`);
resolve(body);
}
})
});
}
I have written test as below:
import createServer from "../../utils/server";
const appserService = require('../../service/provider/appser.service');
const request = require('request');
const app = createServer();
jest.mock('request');
const sid = 'A121';
describe("appserver service", () => {
it("appSerGetCallForwardingState", async () => {
const callForwardApiCallMock = jest.spyOn(appserService, 'callForwardApiCall');
callForwardApiCallMock.mockImplementation(() => {
return Promise.resolve('success');
});
appserService.appSerGetCallForwardingState(sid, 'token').then((res: any) => {
expect(res).toBe('success');
});
});
it("callForwardApiCall", async () => {
request.get.mockResolvedValue({ "success": "true" });
appserService.callForwardApiCall(sid, 'token').then((res: any) => {
expect(res).toBe({ "success": "true" });
});
});
it("callForwardApiCall error", async () => {
request.get.mockRejectedValue(new Error('error'));
appserService.callForwardApiCall(sid, 'token').then((res: any) => {
expect(res).toBe({ "success": "true" });
});
});
});
I am struggling to have good code coverage at - least 90%.
request object also needs to be mocked, and functions are not being exported like callForwardApiCall also not able to access from test file
Here is the report: