The motivation with this module is to provide a high-level abstraction for testing
HTTP, while still allowing you to drop down to the lower-level API provided by superagent.
Install SuperTest as an npm module and save it to your package.json file as a development dependency:
npm install supertest --save-dev
Once installed it can now be referenced by simply calling require('supertest');
You may pass an http.Server, or a Function to request() - if the server is not
already listening for connections then it is bound to an ephemeral port for you so
there is no need to keep track of ports.
SuperTest works with any test framework, here is an example without using any
test framework at all:
One thing to note with the above statement is that superagent now sends any HTTP
error (anything other than a 2XX response code) to the callback as the first argument if
you do not add a status code expect (i.e. .expect(302)).
If you are using the .end() method .expect() assertions that fail will
not throw - they will return the assertion as an error to the .end() callback. In
order to fail the test case, you will need to rethrow or pass err to done(), as follows:
Passing the app or url each time is not necessary, if you're testing
the same host you may simply re-assign the request variable with the
initialization app or url, a new Test is created per request.VERB() call.