SnapFBSnapshotBase is Snapsale's customization of Facebook's snapshot test framework for iOS, FBSnapshotTestCase. It features functionality to automatically perform snapshot tests on all existing layouts for iOS devices.

From FBSnapshotTestCase (quoted from their README):

• Automatically names reference images on disk according to test class and selector.
• Prints a descriptive error message to the console on failure. (Bonus: failure message includes a one-line command to see an image diff if you have Kaleidoscope installed.)
• Supply an optional "identifier" if you want to perform multiple snapshots in a single test method.
• Support for CALayer via FBSnapshotVerifyLayer.
• isDeviceAgnostic to allow appending the device model (iPhone, iPad, iPod Touch, etc), OS version and screen size to the images (allowing to have multiple tests for the same «snapshot» for different OSs and devices).

Our customizations:

• Write one test, run it in record mode on one device, and SnapFBSnapshotBase automatically generates snapshots for the 15 different layouts available on iOS.
• Run a test once, on one device, and SnapFBSnapshotBase automatically compares 15 new snapshots with your 15 saved snapshots.
• Automatic support for size classes if you specify the view being tested (sut)'s backing view controller (sutBackingViewController).

Include SnapFBSnapshotBase in your CocoaPods Podfile:

source 'https://github.com/CocoaPods/Specs.git'
source 'https://github.com/skylib/SnapPods'

target "Tests" do
  pod 'SnapFBSnapshotBase'
end

Please see the FBSnapshotTestCase README for instructions on setting reference image directories.

The example app in this repo provides a simple demonstration of how to write your own tests.

SnapFBSnapshotBase will generate snapshots with the scale of the simulator device that runs the test. As of now, a comparison of a @2x snapshot and an identical @3x snapshot will fail. We therefore recommend choosing one test device or scale, and sticking with it.

This repository contains a customized version of software released under the BSD license. A copy of the original copyright notice is provided in the file LICENSE-FBSnapshotTestCase.

SnapFBSnapshotBase is also released under the BSD license. See the LICENSE file for more info.