Node.js 使用mocha测试节点回调
我尝试从Node.js 使用mocha测试节点回调,node.js,unit-testing,mocha.js,nodes,aws-lambda,Node.js,Unit Testing,Mocha.js,Nodes,Aws Lambda,我尝试从async.falter中提取方法。我想分别测试它们。下面是在AWS上调用lambda的第一个方法 const async = require('async'); const AWS = require('aws-sdk'); AWS.config.region = 'eu-west-1'; const lambda = new AWS.Lambda(); const table_name = 'my_table'; exports.handler = function(event,
async.falter
中提取方法。我想分别测试它们。下面是在AWS上调用lambda的第一个方法
const async = require('async');
const AWS = require('aws-sdk');
AWS.config.region = 'eu-west-1';
const lambda = new AWS.Lambda();
const table_name = 'my_table';
exports.handler = function(event, context) {
async.waterfall([
increase_io_write_capacity(callback)
],
function (err) {
if (err) {
context.fail(err);
} else {
context.succeed('Succeed');
}
});
};
function increase_io_write_capacity(callback) {
var payload = JSON.stringify({
tableName:table_name,
increaseConsumedWriteCapacityUnits: 5
});
var params = {
FunctionName: 'dynamodb_scaling_locker',
InvocationType: 'RequestResponse',
Payload: payload
};
lambda.invoke(params, function(error, data) {
if (error) {
console.log('Error invoker!' + JSON.stringify(error));
callback('Invoker error' + JSON.stringify(error));
} else {
console.log('Done invoker!' + JSON.stringify(data));
callback(null);
}
});
}
if (typeof exports !== 'undefined') {
exports.increase_io_write_capacity = increase_io_write_capacity;
}
测试使用mocha
和aws-sdk-mock
const aws = require('aws-sdk-mock');
const testingAggregate = require('../index.js');
const assert = require('assert');
const expect = require( 'chai' ).expect;
const event = '';
describe('Testing aggregate function', function () {
afterEach(function (done) {
aws.restore();
done();
});
describe('increase_io_write_capacity', function() {
it('fail accessing to the lambda', function(done){
aws.mock('Lambda', 'invoke', function(params, callback){
callback('fail', null);
});
testingAggregate.increase_io_write_capacity(function(err, data){
expect(err).to.equal('Error invoker! fail');
done();
});
});
});
});
问题是它从不断言。我正确地进入了方法,但从未进入lambda.invoke
。似乎mock从未返回回调
Testing aggregate function
increase_io_write_capacity
1) fail accessing to the lambda
0 passing (2s)
1 failing
1) Testing aggregate function increase_io_write_capacity fail accessing to the lambda:
Error: timeout of 2000ms exceeded. Ensure the done() callback is being called in this test.
如果我在aws sdk模拟代码库中尝试一个简单的示例,我不会有任何问题
t.test('mock function replaces method with replace function with lambda', function(st){
awsMock.mock('Lambda', 'invoke', function(params, callback){
callback("error", null);
});
var lambda = new AWS.Lambda();
lambda.invoke({}, function(err, data){
st.equals(err, "error'");
awsMock.restore('Lambda');
st.end();
})
})
也许我没有正确地断言回调的结果
提前感谢您的帮助。我使用aws sdk mock失败了 我最终使用了
proxyquire
。代码没有那么干净,不干燥。我不是JS开发者。但它是有效的。你可以随意改变
const proxyquire = require('proxyquire').noCallThru();
const expect = require( 'chai' ).expect;
describe('testingAggregate', function() {
describe('increase_io_write_capacity', function() {
it('fail invoke the lambda', function(done){
let awsSdkMock = {
config: {
region: 'eu-west-1'
},
Lambda: function() {
this.invoke = function(params, callback) {
expect(params.Payload).to.eq('{"tableName": "my_table_name","increaseConsumedWriteCapacityUnits":5}');
callback(new Error('Lambda not in this region'));
};
}
};
let testingAggregate = proxyquire('../index', { 'aws-sdk': awsSdkMock });
testingAggregate.increase_io_write_capacity(function(err, data){
expect(err).to.equal('Invoker error: Error: Lambda not in this region');
});
done();
});
it('succeed invoking the lambda', function(done){
let awsSdkMock = {
config: {
region: 'eu-west-1'
},
Lambda: function() {
this.invoke = function(params, callback) {
callback(null);
};
}
};
let testingAggregate = proxyquire('../index', { 'aws-sdk': awsSdkMock });
testingAggregate.increase_io_write_capacity(function(err, data){
expect(err).to.equal(null); //really not the best test
});
done();
});
});
});
我使用aws sdk模拟失败 我最终使用了
proxyquire
。代码没有那么干净,不干燥。我不是JS开发者。但它是有效的。你可以随意改变
const proxyquire = require('proxyquire').noCallThru();
const expect = require( 'chai' ).expect;
describe('testingAggregate', function() {
describe('increase_io_write_capacity', function() {
it('fail invoke the lambda', function(done){
let awsSdkMock = {
config: {
region: 'eu-west-1'
},
Lambda: function() {
this.invoke = function(params, callback) {
expect(params.Payload).to.eq('{"tableName": "my_table_name","increaseConsumedWriteCapacityUnits":5}');
callback(new Error('Lambda not in this region'));
};
}
};
let testingAggregate = proxyquire('../index', { 'aws-sdk': awsSdkMock });
testingAggregate.increase_io_write_capacity(function(err, data){
expect(err).to.equal('Invoker error: Error: Lambda not in this region');
});
done();
});
it('succeed invoking the lambda', function(done){
let awsSdkMock = {
config: {
region: 'eu-west-1'
},
Lambda: function() {
this.invoke = function(params, callback) {
callback(null);
};
}
};
let testingAggregate = proxyquire('../index', { 'aws-sdk': awsSdkMock });
testingAggregate.increase_io_write_capacity(function(err, data){
expect(err).to.equal(null); //really not the best test
});
done();
});
});
});
给出testingaggregate的更多代码,包括lamda是如何定义的。可能与示例不匹配。谢谢@JasonLivesay我已经添加了代码。我自己从来没有使用过chai,但是快速查看API文档告诉我没有
eq
方法,而是eql
或equal
方法()。这意味着您的expect(err).to.eq('Error invoker!fail')代码>行抛出异常,并且永远不会调用done()
。感谢@forrert您的编写。我没有成功地改变它。我似乎从来没有进入testingAggregate方法。在模拟中增加测试陷阱中的io写容量。给出testingAggregate的更多代码,包括lamda是如何定义的。可能与示例不匹配。谢谢@JasonLivesay我已经添加了代码。我自己从来没有使用过chai,但是快速查看API文档告诉我没有eq
方法,而是eql
或equal
方法()。这意味着您的expect(err).to.eq('Error invoker!fail')代码>行抛出异常,并且永远不会调用done()
。感谢@forrert您的编写。我没有成功地改变它。我似乎从来没有进入过testingAggregate方法。在模拟中增加测试陷阱中的io写容量。