Jest - 模拟 `config` 模块

Question

I'm writing a unit test where I want to mock the value returned when calling config .

In the module I call config several times, and want to mock the returned value from one of the calls:

const REGION: string = config.get('AWS_DYNAMODB_REGION');
const ENDPOINTS: (string | undefined)[] = config.get('AWS_DYNAMODB_ENDPOINTS');
const CLIENT_TIMEOUT: number = config.get('AWS_DYNAMODB_CLIENT_TIMEOUT');

How can I mock the returned value for config.get('AWS_DYNAMODB_CLIENT_TIMEOUT') for example.

Please advise.