SnappyTestCase

iOS Simulator type agnostic snapshot testing, built on top of the FBSnapshotTestCase.

Why?

Snapshot testing helps to deliver views that scale correctly with a wide range of screen sizes. When it comes to view controllers, we usually want to ensure they keep visual quality on a various set of existing devices, in each supported orientation. Test suite could be run on numerous variants of iOS Simulators. However, this could be a really time-consuming task, for sure not acceptable during a development process. SnappyTestCase tackles this issue by combining test with a set of device definitions (each one including screen size, scale, and orientation) to validate with, ignoring real device simulator context information.

Features

• Simulator type insensitive snapshot testing => restart free, quick various device testing
• Handy definitions of iOS devices to test with - both iPhone and iPad, with chainable filtering API
• Forcing simulator to adopt scale and orientation according to test device definition
• Adding device type and orientation to reference file names
• You can resize one and validate snapshot of another view (for example, you can resize whole window with UITabBarController and validate snapshot of its tab bar only)
• Optional closure executed just before verifying view

Getting Started

Validating view controller on all existing iPhones, with portrait orientation (default):

func testAllDevices() {
    let window = UIWindow()
    window.makeKeyAndVisible()
    window.rootViewController = ExampleViewController(nibName: nil, bundle: nil)
    
    verifyViewSnaps(DeviceRack.iPhone.all, view: window)
}

For more examples of usage check out SnappyDemo project.

Defining device set cheat sheet

Expression	Device set description	Snapshot count
DeviceRack.iPhone.all.landscape	All iPhones, in landscape orientation	4
DeviceRack.iPhone.all.portrait.uniqueWidths	Set of iPhones covering all possible screen widths in portrait orientation	3
DeviceRack.iPad.retina.landscape	Retina 9.7" / 7.9" iPad, landscape	1

Installation using CocoaPods

Add following line to your test target pods list in Podfile:

pod 'SnappyTestCase'

License

SnappyTestCase is distributed under the Apache 2.0 license.

Feedback

We love receiving feedback and we encourage you to contact us and share your thoughts either via e-mail hello@tooploox.com or Twitter by mentioning @tooploox.