A lightweight, low-barrier-to-entry snapshot testing library for iOS

• They're easy to write, maintain, and debug
• They focus on the visual output of your code (which is what the user sees)
• They encourage you to write small, modular, and testable components

• Recording and comparing snapshots of SwiftUI.View, UIView, and UIViewController
• Storing the expected and actual snapshots in the test results

That's it!

• Recording snapshots using different accessibility traits or devices

• Any other use cases that weren't mentioned above

If you are looking for a library that you will use on your production app, you should probably consider more powerful tools like pointfreeco/swift-snapshot-testing or uber/ios-snapshot-test-case. This library is more of a pet project than a finished product. I wanted to snapshot-test the small apps and components I build for fun without importing a full-blown 3rd party for my limited use case.

As a less interesting fact, this is also why I tried to imply the small size of the initiative in the project name, by using the -ino suffix, which appears to be a common diminutive suffix in Italian.

• Add the library as a dependency using Swift Package Manager
• Import snapshotino in your XCTestCase implementation
• Use assertSnapshot to record and compare snapshots, examples below

Simply call assertSnapshot by setting record to true. The test will fail but the snapshot will be recorded under the __snapshots__ folder next to the test file.

func testUIViewController() throws {
    try assertSnapshot(of: SampleViewController(), record: true)
}

Call assertSnapshot without setting the record attribute (it's false by default).

func testUIViewController() throws {
    try assertSnapshot(of: SampleViewController())
}

func testUIView() throws {
    if let view = Bundle.main.loadNibNamed("SampleView", owner: self, options: nil)?.first as? SampleView {
        try assertSnapshot(of: view)
    }
}

func testView() throws {
    let view = ContentView(viewModel: .init(imageName: "circle", text: "test"))
    try assertSnapshot(of: view.asSnapshottableView)
}

Note that SwiftUI.View cannot be used directly because it's not a concrete type. We use the asSnapshottableView property instead, which will return a wrapper type that can be passed to assertSnapshot.

https://github.com/kublaios/KleinSnapshotTesting

This project is released under the MIT license. See LICENSE for details.