This module contains examples of the following Node.js unit testing techniques.
- Generating code coverage reports
- Mocking objects with spies
- Testing asynchronous promises
This module applies behavior-driven development (BDD) testing to Javascript code that does not run in a browser.
The code to be tested consists of two functions: add, which adds two values, and asyncAdd, which adds two values
and returns the result inside a promise object
Run the tests on these functions with
npm test
The scripts section of package.json uses the istanbul code coverage tool
to launch the jasmine-node test runner on the script in the test directory.
This will run the unit tests and generate a code coverage report in the coverage directory.
First the unit tests in this module simply test the add function using expect-style assertions.
Next, they use the spy facility in Jasmine to create a mock of the add function which intercepts and keeps track of
the calls to this function.
Finally, they call the asyncAdd function and verify its resolved value using the eventually idiom provided by the
chai-as-promised package.