Mock AWS SES using jest in typeorm

Need to test AWS SES using jest unit testing But showing different errors, also tried solutions in another stackoverflow question The actual code to be tested is :

public async sentMail(params: ObjectLiteral) {

 // Create the promise and SES service object
    const sendPromise = new AWS.SES({ apiVersion: '2010-12-01' })
      .sendEmail(params)
      .promise();

    // Handle promise's fulfilled/rejected states
    sendPromise
      .then(function (data) {
        console.log(data.MessageId);
      })
      .catch(function (err) {
        console.error(err, err.stack);
      });

the test file is :

import SES from 'aws-sdk/clients/ses';
const mSES = {
    sendEmail: jest.fn().mockReturnThis(),
    promise: jest.fn().mockReturnThis(),
    catch: jest.fn(),
  };
  jest.mock('aws-sdk/clients/ses', () => {
    return jest.fn(() => mSES);
  });

it('should send aws sesemail', async () => {
      // const spy = jest.spyOn(AWS, 'SES');
      const mSes = new SES() as unknown as {
        sendEmail: jest.Mock;
        promise: jest.Mock;
      };
      mSes
        .sendEmail()
        .promise.mockRejectedValueOnce(new Error('This is an SES error'));
      const res = await sesMailService.sentMail(
        {
          toName: 'Name',
          webUrl: 'webUrl',
        },
      );
      expect(mSes.sendEmail).toBeCalledWith({
          toName: 'Name',
          webUrl: 'webUrl',
        }
);
    });

Its giving error message as:

TypeError: mSes.sendEmail(...).promise.mockRejectedValueOnce is not a function

      94 |       mSes
      95 |         .sendEmail()
    > 96 |         .promise.mockRejectedValueOnce(new Error('This is an SES error'));

Answer

Actually this mock works, the reason behind the error is that , i didn’t mocked the AWS.Credentials.

jest.mock('aws-sdk', () => {

  return {

    config: {

      update() {

        return {};

      },

    },

    SES: jest.fn(() => {

      return {

        sendEmail: jest.fn((param) => {

          return {

            promise: () =>

              new Promise((resolve, reject) => {

                param?.Destination.ToAddresses[0] !== '[e-mail]'

                  ? resolve({

                      MessageId: data.MessageId,

                    })

                  : reject(err);

              }),

          };

        }),

      };

    }),

    Credentials: jest.fn(),

  };

});