Sample module for test coverage article

MyModule.js

var _MyModule = {};
// public function
_MyModule.Add = function (a, b) {
    // your code here
    return parseFloat(a) + parseFloat(b);
};
_MyModule.Subtract = function (a, b) {
    // your code here
    return parseFloat(a) - parseFloat(b);
};
module.exports = _MyModule;

MyModule_test.js

var assert = require('assert');
var myModule = require('./MyModule.js');
describe('MyModule Library functions tests', function(){
    var additionArray = [{a:23,b:34,addition:57,subtraction:-11},{a:5,b:1,addition:6,subtraction:4},{a:31,b:10,addition:41,subtraction:21}];
    it('Testing Add function from MyModule', function(){
            additionArray.forEach(function(arrayItem){
            var resultOfAddition = myModule.Add(arrayItem.a,arrayItem.b); 
            assert.equal(resultOfAddition, arrayItem.addition, 'result of addition should be '+arrayItem.addition);
        });
    });
    it('Testing Subtract function from MyModule', function(){
        additionArray.forEach(function(arrayItem){
        var resultOfAddition = myModule.Subtract(arrayItem.a,arrayItem.b); 
        assert.equal(resultOfAddition, arrayItem.subtraction, 'result of subtraction should be '+arrayItem.subtraction);
    });
});
});

package.json

{
  "name": "mymodule",
  "version": "1.0.0",
  "description": "testing code coverage",
  "main": "MyModule.js",
  "scripts": {
    "test": "mocha \"./**_test.js\"",
    "test:coverage": "npm run cover:unit && npm run cover:report",
    "test:coveragehtml": "npm run cover:unit && npm run cover:reporthtml",
    "cover:unit": "nyc --silent npm run test",
    "cover:report": "nyc report --reporter=lcov --reporter=text --report-dir='./jscoverage'",
    "cover:reporthtml": "nyc report --reporter=html --report-dir='./jscoverage'"
  },
  "nyc": {
    "exclude": ["**/*_test.js"]
  },
  "author": "Balinder Singh",
  "license": "ISC",
  "devDependencies": {
    "mocha": "^6.2.2",
    "nyc": "^15.0.0"
  }
}