"scripts": { "dev-test-watch": "mocha-typescript-watch" }, And run the typescript mocha watcher from the terminal using npm run dev-test-watch. Setting up test coverage using Mocha, Istanbul, NYC with TypeScript. Watching and Restarting. Adding a Test. Basics constructs of Mocha. And I don’t like the idea of using yet another transpiler like Babel when I already have the TypeScript compiler. The node package manager, fondly called npm, has had its own share of improvements. Chai for assertion framework. Let’s start by installing these in the project:npm install --save-dev mocha chaiHowever, mocha does not run TypeScript tests all by itself. $ 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. 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. 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., ... TypeScript; This modified text is an extract of the original Stack Overflow Documentation created … You can use the watcher with plain describe, it functions. Andrew de Rozario. I prefer using a tests folder than some .test.ts files. 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). The decorator based interface is not required for use with the watcher. "scripts": { "dev-test-watch": "mocha-typescript-watch" }, And run the typescript mocha watcher from the terminal using npm run dev-test-watch. Unit testing using Typescript and Mocha. To run this code: Go to project root folder; npm install (downloads node dependencies) code . First, create an src directory and inside src create a test directory. 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) (opens project in VS Code) F5 (runs VS code launch task) Tools, Libraries, Frameworks used: Coding Typescript. 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. Sep 30, 2016 • posted in : JavaScript, Node.js. > npm install mocha Create first mocha test. This is a sample taken from my config We can now compile with npm install.. So, let’s start with mocha and chai. Testing framework Mocha. The decorator based interface is not required for use with the watcher. TypeScript Node compiles source code via require(), watching files and code reloads are out of scope for the project.If you want to restart the ts-node process on file change, existing node.js tools such as nodemon, onchange and node-dev work. Code tested in Node.js v6.11.4. Tip: If you must use files, include, or exclude, enable --files flags or set TS_NODE_FILES=true. Testing Node and Express with TypeScript, Mocha, Chai and Sinon.js. This will require an exclude key in your tsconfig (if you have one, obviously).. You can use the watcher with plain describe, it functions. The version 5 makes it unnecessary to use a package manager like yarn, so we can stick to it. ... 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. In javascript or typescript, We have mocha for that purpose. I recently started a project that uses TypeScript for source as well as the tests. 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