Mocking Secrets Manager module for JavaScript jest unit tests - javascript

I'm having trouble getting the AWS Secrets Manager module mocked for the jest unit tests... The part it errors on is the .promise(). When I remove that, the code doesn't work for the real Secrets Manager so I think it needs to stay there. How do I mock the getSecretData function so that getSecretData.promise() will work for the mock?
Here is the SecretsManager.js code:
import AWS from 'aws-sdk';
export class SecretsManager {
constructor() {
AWS.config.update({
region: 'us-east-1',
});
this.secretsManager = new AWS.SecretsManager();
}
async getSecretData(secretName) {
try {
const response = await this.secretsManager.getSecretValue({
SecretId: secretName,
}).promise();
const secretString = response.SecretString;
const parsedSecret = JSON.parse(secretString);
return parsedSecret;
} catch (e) {
console.log('Failed to get data from AWS Secrets Manager.');
console.log(e);
throw new Error('Unable to retrieve data.');
}
}
}
Here is the SecretsManager.test.js code:
import { SecretsManager } from '../utils/SecretsManager';
jest.mock('aws-sdk', () => {
return {
config: {
update(val) {
},
},
SecretsManager: function () {
return {
async getSecretValue({
SecretId: secretName
}) {
return {
promise: function () {
return {
UserName: 'test',
Password: 'password',
};
}
};
}
};
}
}
});
describe('SecretsManager.js', () => {
describe('Given I have a valid secret name', () => {
describe('When I send a request for test_creds', () => {
it('Then the correct data is returned.', async () => {
const mockReturnValue = {
UserName: 'test',
Password: 'password',
};
const logger = getLogger();
const secretManager = new SecretsManager();
const result = await secretManager.getSecretData('test_creds');
expect(result).toEqual(mockReturnValue)
});
});
describe('When I send a request without data', () => {
it('Then an error is thrown.', async () => {
const secretManager = new SecretsManager();
await expect(secretManager.getSecretData()).rejects.toThrow();
});
});
});
});
This is the error I get when running the tests:
this.secretsManager.getSecretValue(...).promise is not a function
Any suggestions or pointers are greatly appreciated!
Thank you for looking at my post.

I finally got it to work... figures it'd happen shortly after posting the question, but instead of deleting the post I'll share how I changed the mock to make it work incase it helps anyone else.
Note: This is just the updated mock, the tests are the same as in the question above.
// I added this because it's closer to how AWS returns data for real.
const mockSecretData = {
ARN: 'x',
Name: 'test_creds',
VersionId: 'x',
SecretString: '{"UserName":"test","Password":"password"}',
VersionStages: ['x'],
CreatedDate: 'x'
}
jest.mock('aws-sdk', () => {
return {
config: {
update(val) {
},
},
SecretsManager: function () {
return {
getSecretValue: function ( { SecretId } ) {
{
// Adding function above to getSecretValue: is what made the original ".promise() is not a function" error go away.
if (SecretId === 'test_creds') {
return {
promise: function () {
return mockSecretData;
}
};
} else {
throw new Error('mock error');
}
}
}
};
}
}});

I ran into this issue as well. There may be a more elegant way to handle this that also allows for greater control and assertion, but I haven't found one. Note that the in-test option may work better with newer versions of Jest.
I personally solved this issue by making use of manual mocks and a custom mock file for aws-sdk. In your case, it would look something like the following:
# app_root/__tests__/__mocks__/aws-sdk.js
const exampleResponse = {
ARN: 'x',
Name: 'test_creds',
VersionId: 'x',
SecretString: '{"UserName":"test","Password":"password"}',
VersionStages: ['x'],
CreatedDate: 'x'
};
const mockPromise = jest.fn().mockResolvedValue(exampleResponse);
const getSecretValue = jest.fn().mockReturnValue({ promise: mockPromise });
function SecretsManager() { this.getSecretValue = getSecretValue };
const AWS = { SecretsManager };
module.exports = AWS;
Then in your test file:
// ... imports
jest.mock('aws-sdk');
// ... your tests
So, in a nutshell:
Instead of mocking directly in your test file, you're handing mocking control to a mock file, which Jest knows to look for in the __mocks__ directory.
You create a mock constructor for the SecretsManager in the mock file
SecretsManager returns an instance with the mock function getSecretValue
getSecretValue returns a mock promise
the mock promise returns the exampleResponse
Bada boom, bada bing. You can read more here.

I ran into a same issue, I have tried to solve as below. It worked perfectly in my case.
Terminalsecret.ts
import AWS from 'aws-sdk';
AWS.config.update({
region: "us-east-1",
});
const client = new AWS.SecretsManager();
export class Secret {
constructor(){}
async getSecret(secretName: string) {
let secret: any;
const data = await client.getSecretValue({ SecretId: secretName).promise();
if ('SecretString' in data) {
secret = data.SecretString;
} else {
const buff = Buffer.alloc(data.SecretBinary as any, 'base64');
secret = buff.toString('ascii');
}
const secretParse = JSON.parse(secret);
return secretParse[secretName];
}
}
Terminalsecret.test.ts
import { SecretsManager as fakeSecretsManager } from 'aws-sdk';
import { Secret } from './terminalSecret';
jest.mock('aws-sdk');
const setup = () => {
const mockGetSecretValue = jest.fn();
fakeSecretsManager.prototype.getSecretValue = mockGetSecretValue;
return { mockGetSecretValue };
};
describe('success', () => {
it('should call getSecretValue with the argument', async () => {
const { mockGetSecretValue } = setup();
mockGetSecretValue.mockReturnValueOnce({
promise: async () => ({ SecretString: '{"userName": "go-me"}' })
});
const fakeName = 'userName';
const terminalSecretMock: TerminalSecret = new TerminalSecret()
terminalSecretMock.getTerminalSecret(fakeName);
expect(mockGetSecretValue).toHaveBeenCalledTimes(1);
});
});

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**Edit: Re-written with a simple example that works first:
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validateLogin
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pgp: pgLib.IMain;
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(global as any)[s] = scope;
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pgp
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How to initialize App Data in node js and access it without being undefined in jest test?

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How to mock a function in another function nodejs

Trying to write a unittest for the below module in /utility/sqsThing.js. However I'm having diffuculty mocking the sqs.sendMessage method. Anyone know how I should go about this. I'm using the sinon library, and mocha for running the tests.
The function that I'm trying to unittest utility/sqsThing.js:
const AWS = require('aws-sdk');
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Running this unittest with mocha tests/unit/sqsThingTest.js however I get:
AssertionError: expected undefined to deeply equal 'test'.
info: Error AccessDenied: Access to the resource https://sqs.us-east-1.amazonaws.com/ is denied..
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var rewire = require("rewire");
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Also you need to return the value of sqs.sendMessage this will remove the issue expected undefined to deeply equal 'test'
Your original file would look the same just with a return statement.
//utility/sqsThing.js
const AWS = require('aws-sdk');
AWS.config.update({ region: 'us-east-1' });
const sqs = new AWS.SQS({ apiVersion: '2012-11-05' });
const outputQueURL = 'https:awsUrl';
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MessageBody: JSON.stringify(results),
QueueUrl: outputQueURL,
};
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}
});
};
You would then write your unit test as follows:
//sqsThingTest.js
var rewire = require("rewire");
var sqsOutputResultSender = rewire('../utility/sqsThing');
const mochaccino = require('mochaccino');
const { expect } = mochaccino;
const sinon = require('sinon');
describe('SQS thing test', function() {
beforeEach(function () {
sqsOutputResultSender.__set__("sqs", {
sendMessage: function() { return 'test' }
});
});
it('sqsOutputResultSender.SQSOutputSender', function() {
// Where the mock substitution should occur
const a = sqsOutputResultSender.SQSOutputSender('a');
expect(a).toEqual('test');
})
});
This example returns an object with a property of sendMessage but this could be replaces with a spy.
Rewire Docs
Try moving the declaration of sqsOutputResultSender after you have stubbed the sendmessage function
var sqsOutputResultSender;
const AWS = require('aws-sdk');
const sqs = new AWS.SQS({ apiVersion: '2012-11-05' });
const mochaccino = require('mochaccino');
const { expect } = mochaccino;
const sinon = require('sinon');
describe('SQS thing test', function() {
beforeEach(function () {
sinon.stub(sqs, 'sendMessage').callsFake( function() { return 'test' });
sqsOutputResultSender = require('../utility/sqsThing');
});
afterEach(function () {
sqs.sendMessage.restore();
});
it('sqsOutputResultSender.SQSOutputSender', function() {
// Where the mock substitution should occur
const a = sqsOutputResultSender.SQSOutputSender('a');
expect(a).toEqual('test');
})
});

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