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