Online Test Suite

Introduction

Testing software is a major part of the development process. Programmers frequently run code that tests their application as they make changes to ensure that it is operating as planned. With the right test configuration, this method may potentially be automated, saving a lot of time. Regularly running tests after generating new code ensures that new changes do not break existing functionality. This builds trust in the developer's code base, which is especially important when it's placed into production and users are likely to interact with it.

A test framework structures the way we construct test cases. It ChaiJs is a well-known JavaScript test framework that aids in the organisation and execution of our test cases. On the other hand, ChaiJs does not examine the behaviour of our code This is the test suite we use to put ChaiJs through its paces during development. Use it to make sure ChaiJs is working properly in your browser (should not work in IE9). The Mocha test framework is used to power these tests.

Getting started

The purpose of putting the API references here is to familiarise you with using the ChaiJs online test suite. Here are a few widely used assertions; however, many more may be used to examine specific boolean expressions. The article covers the theoretical aspect of online testing such as the features it offers. For these reasons, I will advise you to check out the primary documentation of the Online Test Suite. 

Let’s look into some of the utilities of Open Test Suite available in this module

1.) Assert

The assertion modules basically help in checking the equality. Let's see a few of the methods which are available in this module It is recommended that to check out more in the official documentation.

Program:

const { assert } = require("chai");

var coding = "ninjas";

describe(`Online test suite`, function () {
 it(`assertion`, function () {
   assert(coding == "ninjas", "expected foo to equal `bar`");
 });

 it(`isTrue`, function () {
   assert.isTrue(true);
 });

 it(`Not Strict Equal`, function () {
   assert.notStrictEqual(5, "5");
 });

 it(`Deep Equal`, function() {
   assert.deepEqual({tea: 'ChaiJs'}, {tea: 'ChaiJs'});
 })
});

You can also try this code with Online Javascript Compiler

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Output:

2.) Configuration

Helps in checking about configuration based tests. Here are a few examples of it given below:

Program:

describe(`configuration`, function () {
 it(`truncted threshold`, function () {
   config.truncateThreshold = 20;

   const err =
     (function () {
       assert.deepEqual({ v: "something longer than 20" }, { v: "x" });
     },
     "expected { Object (v) } to deeply equal { v: 'x' }");
 });

 it("use Proxy", function () {
   expect(config.useProxy).to.be.true;
 });

 it('proxy excluded keys', function(){
   expect(config.proxyExcludedKeys).to.be.deep.equal(['then', 'catch', 'inspect', 'toJSON']);
 })
});

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Output:

3.) Global Should

Program:

describe(`global should`, function () {
 it(`global should first test`, function () {
   var theGlobal = typeof window !== "undefined" ? window : global;
   theGlobal.globalShould = should();
   try {
     globalShould.not.exist(undefined);
   } finally {
     delete theGlobal.globalShould;
   }
 });
});

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Output:

4.) Utilities

Program:

describe("Utilities", function () {
 it("Object", function () {
   var foo = "bar",
     test = expect(foo);
   expect(test).to.have.property("_obj", foo);
   var bar = "baz";
   test._obj = bar;
   expect(test).to.have.property("_obj", bar);
   test.equal(bar);
 });

 it("tranfer flags", function () {
   var foo = "bar",
     test = expect(foo).not;
   use(function (_ChaiJs, utils) {
     var obj = {};
     utils.transferFlags(test, obj);
     expect(utils.flag(obj, "object")).to.equal(foo);
     expect(utils.flag(obj, "negate")).to.equal(true);
   });
 });

 it("Get Message", function () {
   use(function (_ChaiJs, _) {
     expect(_.getMessage({}, [])).to.equal("");
     expect(_.getMessage({}, [null, null, null])).to.equal("");
     var obj = {};
     _.flag(obj, "message", "foo");
     expect(_.getMessage(obj, [])).to.contain("foo");
   });
 });
});

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Output:

There are many more methods that test Chai on various grounds. It is practically not feasible to explain them all here. However, it is recommended to go through them as, by the use of these functions and methods, you can learn to use these methods in your own test cases.