Unit Testing using mocha-chai-ts-istanbul

Author: learning-zone

js-unit-test-examples/mocha-chai-ts-istanbul/package.json

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+{
+  "name": "js-unit-test-examples-mocha-chai-ts-istanbul",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "directories": {
+    "test": "test"
+  },
+  "scripts": {
+    "test": "ts-node node_modules/istanbul/lib/cli.js cover -e .ts node_modules/mocha/bin/_mocha -- test/**/*.test.ts"
+  },
+  "author": "",
+  "license": "Unlicense",
+  "devDependencies": {
+    "@types/mocha": "^2.2.38",
+    "@types/node": "^7.0.4",
+    "chai": "^3.5.0",
+    "istanbul": "^1.1.0-alpha.1",
+    "mocha": "^3.2.0",
+    "ts-node": "^2.0.0",
+    "typescript": "^2.1.5"
+  }
+}

js-unit-test-examples/mocha-chai-ts-istanbul/src/index.ts

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+export class MathLib {
+  add(a, b): Number {
+    return a + b;
+  }
+
+  multiply(a, b): Number {
+    return a * b;
+  }
+
+  fibonacci(length): Number[] {
+    const sequence = [0, 1];
+    for (let i = 2; i <= length; ++i) {
+      sequence[i] = sequence[i - 1] + sequence[i - 2];
+    }
+    return sequence;
+  };
+}

js-unit-test-examples/mocha-chai-ts-istanbul/test/index.test.ts

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+/// <reference path="../node_modules/@types/node/index.d.ts" />
+/// <reference path="../node_modules/@types/mocha/index.d.ts" />
+
+import { expect } from 'chai';
+import { MathLib } from '../src';
+
+describe('MathLib', () => {
+  describe('add', () => {
+    it('adds two numbers together', () => {
+      const mathLib = new MathLib();
+      const result = mathLib.add(1, 2);
+      expect(result).to.equal(3);
+    });
+  });
+
+  describe('multiply', () => {
+    it('multiply two numbers', () =>{
+      const mathLib = new MathLib();
+      const result = mathLib.multiply(3, 3);
+      expect(result).to.equal(9);
+    });
+  });
+
+  describe('fibonacci', () =>{
+    it('generates a valid fibonacci sequence', () =>{
+      const mathLib = new MathLib();
+      const result = mathLib.fibonacci(12);
+      expect(result[12]).to.equal(144);
+    });
+  });
+});