unitTesting.ts

const dummyContext = {
    callbackWaitsForEmptyEventLoop: true,
    functionVersion: '$LATEST',
    functionName: 'foo-bar-function',
    memoryLimitInMB: '128',
    logGroupName: '/aws/lambda/foo-bar-function',
    logStreamName: '2021/03/09/[$LATEST]abcdef123456abcdef123456abcdef123456',
    invokedFunctionArn: 'arn:aws:lambda:eu-west-1:123456789012:function:foo-bar-function',
    awsRequestId: 'c6af9ac6-7b61-11e6-9a41-93e812345678',
    getRemainingTimeInMillis: () => 1234,
    done: () => console.log('Done!'),
    fail: () => console.log('Failed!'),
    succeed: () => console.log('Succeeded!'),
};

describe('MyUnitTest', () => {

    test('Lambda invoked successfully', async () => {
    
        const testEvent = { test: 'test' };
        await handler(testEvent, dummyContext);

    });

});