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https://github.com/marcl/js-unit-testing-examples
🤓 JavaScript Unit Testing Examples
https://github.com/marcl/js-unit-testing-examples
chai express javascript middleware mocha promises sinon unit-testing
Last synced: about 2 months ago
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🤓 JavaScript Unit Testing Examples
- Host: GitHub
- URL: https://github.com/marcl/js-unit-testing-examples
- Owner: MarcL
- License: mit
- Created: 2017-02-25T15:25:11.000Z (almost 8 years ago)
- Default Branch: master
- Last Pushed: 2023-03-14T10:49:15.000Z (almost 2 years ago)
- Last Synced: 2024-11-07T09:02:51.940Z (about 2 months ago)
- Topics: chai, express, javascript, middleware, mocha, promises, sinon, unit-testing
- Language: JavaScript
- Homepage:
- Size: 21.5 KB
- Stars: 20
- Watchers: 4
- Forks: 25
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# JavaScript Unit Testing Examples
Example project to allow me to show how best to unit test a JavaScript Express application.
## Install
Clone this repository and install the dependencies as follows:
```
git clone [email protected]:MarcL/js-unit-testing-framework.git
npm install
```
## Running the tests
The code sets up a basic Express server with a few routes and some tests which cover testing the server setup. Run the test suite using npm:
```
npm test
```
## JavaScript Tests
Take a look in the `test` directory to see all of the test code. There are lots of examples of different types of tests and how to create them.
### Asynchronous functions and promises
Some examples of how to test asynchronous functions and promises, including some tips and tricks and gotchas.
#### Asynchronous function
- Timeout because `done` callback isn't called when function succeeds
- Passing test but slow because timer isn't stubbed
- Passing test and fast because timer is stubbed
- Timeout because `done` callback isn't called when function throws an error
- Passing test to call `done` callback when function throws an error
#### Promise : resolving
- Test passes incorrectly because Promise isn't returned
- Passing test because promise is returned
- Passing test because `done` callback is called after resolution
- Passing test because `done` callback is called after resolution using `chai-as-promised` syntax
#### Promise : rejecting
- Test passes incorrectly because Promise isn't returned
- Failing test because rejected Promise error isn't caught
- Passing test because Promise is returned and rejection is caught
- Passing test because Promise rejection is caught and `done` callback is called
- Passing test because Promise rejection is caught and `done` callback is called using `chai-as-promised` syntax
#### Slow tests
- Passing test but is slow due to Promise function in chain taking a long time
- Passing test and much faster as longer function is now stubbed to execute immediately
## License
See [LICENSE](LICENSE)