我正在为NodeJS项目设置一些单元测试,但我想知道如何模拟我对AWS服务的使用。我使用的种类繁多:SNS,SQS,DynamoDB,S3,ECS,EC2,Autoscaling等。有没有人对我如何嘲笑它们有什么好的线索?
谢谢!
答案 0 :(得分:0)
我尝试使用aws-sdk-mock,但无法使其正常运行。我结果只是使用sinon来存根我需要的函数调用。
答案 1 :(得分:0)
我只是花了几个小时尝试使AWS SQS模拟工作正常,没有求助于在功能内导入aws-sdk-mock
客户端的aws-sdk
要求。
AWS.DynamoDB.DocumentClient
的模拟非常简单,但是AWS.SQS
的模拟让我很困惑,直到我遇到使用rewire的建议。
我的lambda将错误消息移至SQS FailQueue(而不是让Lambda失败并将消息返回至常规Queue以进行重试,然后在maxRetries之后将DeadLetterQueue返回)。模拟以下SQS方法所需的单元测试:
SQS.getQueueUrl
SQS.sendMessage
SQS.deleteMessage
在尽量包括所有相关部分的同时,我将尽量简化示例代码:
我的AWS Lambda(index.js)的片段:
const AWS = require('aws-sdk');
AWS.config.update({region:'eu-west-1'});
const docClient = new AWS.DynamoDB.DocumentClient();
const sqs = new AWS.SQS({ apiVersion: '2012-11-05' });
// ...snip
删节的Lambda事件记录(event.json)
{
"valid": {
"Records": [{
"messageId": "c292410d-3b27-49ae-8e1f-0eb155f0710b",
"receiptHandle": "AQEBz5JUoLYsn4dstTAxP7/IF9+T1S994n3FLkMvMmAh1Ut/Elpc0tbNZSaCPYDvP+mBBecVWmAM88SgW7iI8T65Blz3cXshP3keWzCgLCnmkwGvDHBYFVccm93yuMe0i5W02jX0s1LJuNVYI1aVtyz19IbzlVksp+z2RxAX6zMhcTy3VzusIZ6aDORW6yYppIYtKuB2G4Ftf8SE4XPzXo5RCdYirja1aMuh9DluEtSIW+lgDQcHbhIZeJx0eC09KQGJSF2uKk2BqTGvQrknw0EvjNEl6Jv56lWKyFT78K3TLBy2XdGFKQTsSALBNtlwFd8ZzcJoMaUFpbJVkzuLDST1y4nKQi7MK58JMsZ4ujZJnYvKFvgtc6YfWgsEuV0QSL9U5FradtXg4EnaBOnGVTFrbE18DoEuvUUiO7ZQPO9auS4=",
"body": "{ \"key1\": \"value 1\", \"key2\": \"value 2\", \"key3\": \"value 3\", \"key4\": \"value 4\", \"key5\": \"value 5\" }",
"attributes": {
"ApproximateReceiveCount": "1",
"SentTimestamp": "1536763724607",
"SenderId": "AROAJAAXYIAN46PWMV46S:steve.goossens@bbc.co.uk",
"ApproximateFirstReceiveTimestamp": "1536763724618"
},
"messageAttributes": {},
"md5OfBody": "e5b16f3a468e6547785a3454cfb33293",
"eventSource": "aws:sqs",
"eventSourceARN": "arn:aws:sqs:eu-west-1:123456789012:sqs-queue-name",
"awsRegion": "eu-west-1"
}]
}
}
节略的单元测试文件(test / index.test.js):
const AWS = require('aws-sdk');
const expect = require('chai').expect;
const LamdbaTester = require('lambda-tester');
const rewire = require('rewire');
const sinon = require('sinon');
const event = require('./event');
const lambda = rewire('../index');
let sinonSandbox;
function mockGoodSqsMove() {
const promiseStubSqs = sinonSandbox.stub().resolves({});
const sqsMock = {
getQueueUrl: () => ({ promise: sinonSandbox.stub().resolves({ QueueUrl: 'queue-url' }) }),
sendMessage: () => ({ promise: promiseStubSqs }),
deleteMessage: () => ({ promise: promiseStubSqs })
}
lambda.__set__('sqs', sqsMock);
}
describe('handler', function () {
beforeEach(() => {
sinonSandbox = sinon.createSandbox();
});
afterEach(() => {
sinonSandbox.restore();
});
describe('when SQS message is in dedupe cache', function () {
beforeEach(() => {
// mock SQS
mockGoodSqsMove();
// mock DynamoDBClient
const promiseStub = sinonSandbox.stub().resolves({'Item': 'something'});
sinonSandbox.stub(AWS.DynamoDB.DocumentClient.prototype, 'get').returns({ promise: promiseStub });
});
it('should return an error for a duplicate message', function () {
return LamdbaTester(lambda.handler)
.event(event.valid)
.expectReject((err, additional) => {
expect(err).to.have.property('message', 'Duplicate message: {"Item":"something"}');
});
});
});
});
答案 2 :(得分:0)
看看LocalStack。它提供了一个易于使用的测试/模拟框架,用于通过在本地计算机或Docker中启动与AWS兼容的API来开发与AWS相关的应用程序。它支持两种AWS API,其中包括SQS。确实是功能测试的绝佳工具,无需为此在AWS中使用单独的环境。