node. JS Test Summary

This article is a recent summary of the learning of node. JS testing, including unit testing, integration testing, benchmarking, and code coverage testing, among many other things. For medium-to large-scale projects, complete test cases help ensure the continuous integration of projects and the robustness of the code.Unit TestUnit test, also known as Module test, is the correctness test for the smallest execution unit in the program. Common development patterns include the two classes of TDD and BDD. TDD (Test-driven development, test-driven development), writes test cases first, then develops modules for test cases, complements test cases when the test case is insufficient, and continuously updates the module code when the module fails to pass the test until it passes through the test case completely. Its development core revolves around the test case, that is, the integrity of the test case determines the robustness and correctness of the development module, which is prone to the problem of insufficient coverage of the unit test by boundary conditions. BDD (Behavior-driven development, behavior-driven development), the Semantic programming language develops test cases that are close to the business requirements, and then drives the development of related modules. AVA is the most trendy test framework in the JavaScript ecosystem, with built-in Babel that can be used directly with ES6 syntax, with the advantages of lightweight, efficient, concurrent execution, forced isolation, and installation methods: NPM Install--save-dev Ava Set the Scripts field in Package.json: { "Scripts": { "Test": "Ava", "Test:watch": "Ava--watch" } } Run: NPM Test # or NPM Test:watch The following is a basic test code: Import test from ' Ava '; Const Fibonacci = (N) = = { if (n = = = 0 | | n = = 1) { return n; } Return Fibonacci (n-1) + Fibonacci (n-2); } Test (' Test Fibonacci (0) ', t = = { T.is (Fibonacci (0), 0); }); Test (' Test Fibonacci (1) ', t = = { T.is (Fibonacci (1), 1); }); HOOK CALLS Test.before (' before ', t + = { Console.log (' before '); }); Test.after (' after ', t + = { Console.log (' after '); }); Test.beforeeach (' Beforeeach ', t + = { Console.log (' Beforeeach '); }); Test.aftereach (' Aftereach ', t + = { Console.log (' Aftereach '); }); In the above code, we first introduced the AVA module, then created the Fibonacci function to be tested, followed by two test cases, and finally four hook methods: before ()/after ()/Beforeeach ()/Aftereach (). AVA provides a cosmetic method to specify how tests are performed: 1. Skip (), skip the test case with Skip () added, 2, only (), execute only Test cases with only () added, 3, Todo (), placeholder identifiers, represent test cases to be added in the future, 4, serial (), serial execution of test cases, AVA by default Test cases are executed in a parallel manner. Test (' Test Fibonacci (0) ', t = = { T.is (Fibonacci (0), 0); }); In the above code callback function, T, called the assertion execution object, contains the following methods: ·T.end (), end test, only valid in TEST.CB ()·T.plan (count), specifying the number of executions·T.pass ([message]), tested by·T.fail ([message]), test failed·T.ok (value, [message]), asserting that value is true·T.notok (value, [message]), which asserts that value is a false value·T.true (value, [message]), asserts that value is true·T.false (value, [message]), asserts that value is False·T.is (value, expected, [message]), asserts value = = = Expected·T.not (value, expected, [message]), asserts that the value!== expected·T.same (value, expected, [message]), asserting that value and expected depth are equal·T.notsame (value, expected, [message]), asserting value and expected depth range·T.throws (function | promise, [ERROR, [message]]), assertion function throws an exception or Promisereject error·T.notthrows (function | promise, [message]), asserting that function is not unusual or promise resolve·T.regex (contents, regex, [message]), Assert contents matches regex·T.iferror (Error, [message]), assertion error is false value Integration Testing In contrast to unit tests that focus on micro-modules, integration testing is a macro-holistic approach to identifying problems, so also known as assembly testing and joint testing. Travis CI is an excellent continuous integration tool that listens to updates on Github projects and facilitates integration testing of open source software. Using Travis CI requires creating a. travis.yml configuration file in the root directory of the project (for example, node. js): Language:node_js NODE_JS: -"6" -"5" Before_script: Script -NPM Test -Node Benchmark/index.js After_script: By default, Travis CI automatically installs dependencies and executes the NPM Test command, and the Script field allows you to customize the commands that need to be executed, with the complete life cycle including: ·Install apt Addons·Before_install·Install·Before_script·Script·After_success or After_failure·OPTIONAL Before_deploy·OPTIONAL Deploy·OPTIONAL After_deploy·After_script Benchmark TestBenchmark tests use rigorous testing methods, test tools, or test systems to evaluate the performance of the target module, which is often used to observe the performance of the software and hardware environment after the change, and the results are reproducible. The most commonly used benchmark tool in the node. JS Environment is Benchmark.js, which is installed as follows: NPM Install--save-dev Benchmark Basic example: Const Benchmark = require (' Benchmark '); Const SUITE = new Benchmark.suite; Suite.add (' Regexp#test ', function () { /o/.test (' Hello world! '); }) . Add (' String#indexof ', function () { ' Hello world! '. IndexOf (' O ') >-1; }) . On (' Cycle ', function (event) { Console.log (String (event.target)); }) . On (' Complete ', function () { Console.log (' fastest is ' + this.filter (' fastest '). Map (' name ')); }) Run Async . Run ({' Async ': true}); Code CoverageThe Code coverage tool determines the integrity of a module based on the number of lines of code and number of branches covered by the test case. AVA recommends using the NYC test code coverage to install NYC: NPM Install NYC--save-dev Modify. Gitignore Ignore related files: Node_modules Coverage . nyc_output Modify the Test field in Package.json: { "Scripts": { "Test": "NYC Ava" } } Execute NPM Test and get: ➜test-in-action (master) ✔npm test > test-in-action@1.0.0 test/users/sean/desktop/test-in-action > NYC AVA 2 passed ----------|----------|----------|----------|----------|----------------| File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Lines | ----------|----------|----------|----------|----------|----------------| ----------|----------|----------|----------|----------|----------------| All Files | 100 | 100 | 100 | 100 | | ----------|----------|----------|----------|----------|----------------| Due to uploading attachments and text restrictions, sometimes some pictures, text may not display, details see: http://mp.weixin.qq.com/s?__biz=MzI5ODI3NzY2MA==&mid=100000510&idx=2 &sn=8339d4fca5f54ab3a9ec305eae756436#rd welcome everybody to exchange together. Scan the following two-dimensional code for more beautiful articles! (scan the code to pay attention to the unexpected surprise!!) ） subscription number QR code. jpg (39.39 KB, download number: 0) Download attachments 2016-5-18 16:44 Upload Follow us on our subscription number (UNIGUYTECH100) and service number (Uniguytech) for more beautiful articles! Also welcome to join the "Everyone Technical network discussion QQ Group", group number: 256175955, please note your personal introduction! Let's talk about it!

