Perceptual diffing suite
built on Nightmare by Segment

You can look at test/index.js as an example for how to use Niffy. To run the example test just do make test after cloning this repo.

Niffy is built on Nightmare and used in combination with Mocha. You'll also need to read and use both of those library's APIs to use niffy effectively.

To create a new Niffy differ:

let niffy = new Niffy(basehost, testhost, nightmareOptions);

• basehost is the url that is assumed "good"
• testhost is the url that you are comparing to the base
• nightmareOptions can be seen here in the Nightmare docs
  • .threshold is the maximum percentage difference for a passing test (default: 0.2%)

This method instructs niffy to go to a url (and optionally take additional actions like clicking, typing or checkboxing via the fn argument), and test basehost vs. testhost screenshots for pixel differences, and output the diff-highlight image. Typically you'll use .test(url, fn) in the body of a mocha test, like this:

it('/news', function* () {
  yield niffy.test('/news');
});

This method instructs niffy to go to a url and optionally take additional actions like clicking, typing or checkboxing via the fn argument. Typically you'll use .goto(url, fn) in the before method of a mocha test suite, like this:

before(function* () {
  yield niffy.goto('/logout', function* (nightmare) {
    yield nightmare
      .type('input[name="email"]', 'fake@faketestfaketest.com')
      .type('input[name="password"]', 'fakepassword')
      .click('button[type="submit"]');
  });
});

This method closes the underlying Nightmare instance (e.g. freeing up memory). Typically you'll use .end() in the after method of a mocha test suite, like this:

after(function* () {
  yield niffy.end();
});

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