Adding a Test. This is a sample taken from my config I recently started a project that uses TypeScript for source as well as the tests. The decorator based interface is not required for use with the watcher. To run this code: Go to project root folder; npm install (downloads node dependencies) code . "scripts": { "dev-test-watch": "mocha-typescript-watch" }, And run the typescript mocha watcher from the terminal using npm run dev-test-watch. Sep 30, 2016 • posted in : JavaScript, Node.js. testing-with-jest git: (master) npm run test > express-api @ 1.0.0 test / tutorials / typescript / testing-with-jest > mocha -r ts-node / register src /**/*.spec.ts Hello API Request should return awesome on call 1 passing (54 ms) It’s a pleasure to work with a project that uses TypeScript for your source code and tests, although setting up test coverage can be a bit tricky. It is very commonly used. This will require an exclude key in your tsconfig (if you have one, obviously).. Chai for assertion framework. The version 5 makes it unnecessary to use a package manager like yarn, so we can stick to it. Watching and Restarting. Let's create our first test; following convention lets create our test-case in test/CalculatorTest.. Before writing the test-case we need to grab the Mocha Type Definitions (requried for the TypeScript compiler (tsc) to work).Easiest way to get these it to use the DefinitelyTyped TypeScript Definition manager (tsd). Andrew de Rozario. Let’s start by installing these in the project:npm install --save-dev mocha chaiHowever, mocha does not run TypeScript tests all by itself. Unit testing using Typescript and Mocha. Setting up test coverage using Mocha, Istanbul, NYC with TypeScript. Testing Node and Express with TypeScript, Mocha, Chai and Sinon.js. $ npm install -g ts-node $ mocha test.ts --require ts-node/register src/**/*.spec.ts It also appears that there has been some ongoing discussion about deprecating typescript-require in favor of ts-node. And I don’t like the idea of using yet another transpiler like Babel when I already have the TypeScript compiler. Basics constructs of Mocha. We can now compile with npm install.. "scripts": { "dev-test-watch": "mocha-typescript-watch" }, And run the typescript mocha watcher from the terminal using npm run dev-test-watch. Code tested in Node.js v6.11.4. First, create an src directory and inside src create a test directory. You can use the watcher with plain describe, it functions. Tip: If you must use files, include, or exclude, enable --files flags or set TS_NODE_FILES=true. So, let’s start with mocha and chai. The node package manager, fondly called npm, has had its own share of improvements. You can use the watcher with plain describe, it functions. ... npm install chai mocha sinon @types/chai @types/mocha @types/sinon --save-dev As none of these are actually required to run our application we use the "--save-dev" flag. The decorator based interface is not required for use with the watcher. This will set the right flag for module, if you have commonjs already you can skip everything until mocha, for ts-node that supports only commonjs modules then it runs tests using mocha. (opens project in VS Code) F5 (runs VS code launch task) Tools, Libraries, Frameworks used: Coding Typescript. In javascript or typescript, We have mocha for that purpose. For a global install use npm as follow: $ npm install mocha -g This will install mocha in your global environment and bind the mocha command to your CLI., ... 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