How do we mock s3.getObject(...).promise?

[manjufy]

When I try to mock, s3.getObject(...).promise, I get the following error.

TypeError: s3.getObject(...).promise is not a function

[AllanZhengYP]

Hi @manju16832003
s3.getObject and almost all other operations are initialized and bound to AWS object at runtime, so you cannot find the function. They are just not there yet. But it's available after you instantiate the s3 client.

const s3 = new AWS.S3({region: 'region'});
console.log('promise is a function: ', s3.getObject(params).promise);

I don't have the information of where this error is raised. But I write a simplified mock function that should work:

var AWS = require('aws-sdk');
describe ('mock promise', () => {
    it ('test', () => {
        var s3 = new AWS.S3({region: 'us-west-2'});
        var request = s3.putObject({
            Bucket: 'bucket', 
            Key: 'key'
        });
        request.promise = () => Promise.resolve('mockdata');
        request.promise().then((data) => {expect(data).toEqual('mockResp')})
    })
})

Here the request is sent on wire still.

[manjufy]

@AllanFly120 That was helpful thanks a lot 👍

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