CODEWITHSUNDEEP
javascript
Tiago Silva
Tiago Silva

Reputation: 259

How to call function within a function

I tried many things already, nothing works. How do I mock the promise return await this.getDbClient().put(params).promise();

Any help?

 const car: Car = {
    id: 892421
};    



it('#DatabaseHandler should create car', async () => {
        DatabaseHandler.getDbClient().put = jest.fn().mockImplementation(() => car); 
        const result = await DatabaseHandler.createCar(car); // error here
        expect(result).toEqual(car);
    });

DatabaseHandler

import { DynamoDB } from 'aws-sdk';
import { DocumentClient } from 'aws-sdk/clients/dynamodb';
import { Car } from '/opt/nodejs/models/car.interface';

const documentClient = new DynamoDB.DocumentClient();

export class DatabaseHandler {
    private static tableName: string = 'cars';

    static getDbClient = (): DynamoDB.DocumentClient => {
        return documentClient;
    }

    static createCar = async (car: Car) => {
        const params: DocumentClient.PutItemInput = {
            TableName: this.tableName,
            Item: car
        }
        await this.getDbClient().put(params).promise();
    }
}

TypeError: this.getDbClient(...).put(...).promise is not a functionJest

Upvotes: 0

Views: 69

Answers (1)

hawks
hawks

Reputation: 931

The put method returns an object that has a promise method you are not mocking that one.

Try this

DatabaseHandler.getDbClient().put = jest.fn().mockImplementation(() => {
  // returning an object that has the promise method
  return {
    promise: () => Promise.resolve(car)
  }
});

Upvotes: 1

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