Typescript is set up and there's a function simpleGreeting defined in src/greetings.ts
We've installed Mocha and Chai, as well as their types.
npm install --save-dev mocha @types/mocha chai @types/chai
- Mocha is the test runner.
- Chai is the assertion library we've chosen to use for our tests.
We've also installed ts-node, which will be used to compile typescript on-the-fly.
npm install ts-node
We've added a unit test for simpleGreeting in test/unit/greetings.spec.ts
We set up package.json so that npm test will run our tests.
"scripts": {
"test": "mocha --config test/runners/mocha/.mocharc.jsonc"
},
The mocha configuration file .mocharc.jsonc has been set up to find our tests and run test/runners/mocha/init.js.
The project compiles typescript into something other than commonjs modules. Node doesn't play nicely with other formats, so we've added a separate tsconfig.json just for mocha, which init.js feeds into ts-node.
Without that separate tsconfig, we'd get an error like this:
SyntaxError: Cannot use import statement outside a module
Running npm test should output something like this:
simpleGreeting
√ should say hello
1 passing (8ms)
We installed ts-mockito.
npm install --save-dev ts-mockito
Some contrived things have been added to src/ to be used as an example for mocking.
- targetedGreeting
- INamed
- MyComplicatedDomainModel
We wrote a unit test for targetedGreeting in greetings.spec.ts and used ts-mockito to mock MyComplicatedDomainModel.