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Snapshot view unit tests for iOS

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Snapshot view unit tests for iOS

📸 Delightful Swift snapshot testing.

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Simple BDD for iOS

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A Matcher Framework for Swift and Objective-C

Common Xcode configuration files/settings.

Quick Overview

iOS Snapshot Test Case is a library for snapshot testing iOS applications. It allows developers to capture the appearance of UI components or entire screens as images and compare them against reference images to detect visual regressions. This tool is particularly useful for ensuring UI consistency across different devices and iOS versions.

Pros

  • Easy integration with existing XCTest framework
  • Supports both UIKit and SwiftUI
  • Provides a visual way to catch UI regressions
  • Allows for device-specific snapshot comparisons

Cons

  • Can be sensitive to minor pixel differences, leading to false positives
  • Requires manual review and approval of new reference images
  • May slow down test suites due to image comparisons
  • Maintenance of reference images can become cumbersome for large projects

Code Examples

  1. Creating a simple snapshot test:
import FBSnapshotTestCase

class MyViewControllerTests: FBSnapshotTestCase {
    override func setUp() {
        super.setUp()
        recordMode = false // Set to true to record new reference images
    }
    
    func testMyViewController() {
        let vc = MyViewController()
        FBSnapshotVerifyViewController(vc)
    }
}
  1. Testing a specific view with custom identifier:
func testMyCustomView() {
    let view = MyCustomView(frame: CGRect(x: 0, y: 0, width: 320, height: 100))
    FBSnapshotVerifyView(view, identifier: "CustomIdentifier")
}
  1. Testing with different device configurations:
func testMyViewOnDifferentDevices() {
    let view = MyView(frame: CGRect(x: 0, y: 0, width: 320, height: 480))
    
    FBSnapshotVerifyView(view, identifier: "iPhone8")
    
    view.frame = CGRect(x: 0, y: 0, width: 414, height: 736)
    FBSnapshotVerifyView(view, identifier: "iPhone8Plus")
}

Getting Started

  1. Add the following to your Podfile:

    pod 'iOSSnapshotTestCase'
    
  2. Run pod install in your terminal.

  3. Import the framework in your test file:

    import FBSnapshotTestCase
    
  4. Subclass FBSnapshotTestCase instead of XCTestCase:

    class MyTests: FBSnapshotTestCase {
        // Your test methods here
    }
    
  5. Run your tests with recordMode = true to generate reference images, then set it back to false for subsequent test runs.

Competitor Comparisons

Snapshot view unit tests for iOS

Pros of ios-snapshot-test-case (Uber)

  • More actively maintained with recent updates and contributions
  • Improved support for Swift and modern iOS development practices
  • Enhanced performance and stability for larger test suites

Cons of ios-snapshot-test-case (Uber)

  • Potential compatibility issues with older projects using the Facebook version
  • May require additional setup or migration for existing projects
  • Some features or APIs might differ from the original implementation

Code Comparison

Facebook version:

FBSnapshotVerifyView(view)
FBSnapshotVerifyLayer(layer)
FBSnapshotVerifyViewController(viewController)

Uber version:

verifyView(view)
verifyLayer(layer)
verifyViewController(viewController)

The Uber version simplifies the API naming convention, removing the "FB" prefix and making the method names more concise. Both versions provide similar functionality for snapshot testing views, layers, and view controllers, but the Uber version may offer additional features or optimizations not present in the Facebook archive.

Overall, the Uber fork of ios-snapshot-test-case provides a more up-to-date and actively maintained solution for iOS snapshot testing, with potential improvements in performance and Swift support. However, projects already using the Facebook version may need to consider migration efforts and potential compatibility issues when switching to the Uber fork.

📸 Delightful Swift snapshot testing.

Pros of swift-snapshot-testing

  • More flexible and extensible, supporting various types of snapshots (e.g., UIImage, String, Data)
  • Better Swift integration with a more idiomatic API
  • Actively maintained and regularly updated

Cons of swift-snapshot-testing

  • Steeper learning curve due to its more advanced features
  • May require more setup and configuration for complex scenarios
  • Potentially slower test execution for large test suites

Code Comparison

ios-snapshot-test-case:

FBSnapshotVerifyView(view)
FBSnapshotVerifyLayer(layer)
FBSnapshotVerifyViewController(viewController)

swift-snapshot-testing:

assertSnapshot(matching: view, as: .image)
assertSnapshot(matching: layer, as: .image)
assertSnapshot(matching: viewController, as: .image)

The swift-snapshot-testing syntax is more consistent and allows for different snapshot types using the as: parameter. It also provides a more flexible API for custom snapshot strategies and assertions.

Both libraries serve similar purposes, but swift-snapshot-testing offers more modern Swift features and greater extensibility. ios-snapshot-test-case may be simpler for basic use cases, while swift-snapshot-testing provides more power and flexibility for complex testing scenarios.

4,141

Simple BDD for iOS

Pros of Kiwi

  • Provides a full BDD testing framework for iOS development
  • Offers a more expressive and readable syntax for writing tests
  • Includes built-in mocking and stubbing capabilities

Cons of Kiwi

  • Steeper learning curve compared to snapshot testing
  • May require more setup and configuration
  • Less focused on UI testing specifically

Code Comparison

Kiwi example:

describe(@"MyClass", ^{
    it(@"should do something", ^{
        MyClass *obj = [[MyClass alloc] init];
        [[obj should] receive:@selector(doSomething)];
        [obj performAction];
    });
});

ios-snapshot-test-case example:

- (void)testMyView {
    UIView *view = [self setupView];
    FBSnapshotVerifyView(view, nil);
}

Kiwi provides a more descriptive and behavior-driven approach to testing, while ios-snapshot-test-case focuses specifically on visual comparison of UI components. Kiwi offers a broader range of testing capabilities, including mocking and stubbing, making it suitable for various types of tests. ios-snapshot-test-case, on the other hand, excels in quickly verifying UI changes and regressions through visual comparisons.

4,802

A Matcher Framework for Swift and Objective-C

Pros of Nimble

  • More versatile testing framework, not limited to snapshot testing
  • Supports a wide range of matchers for various types of assertions
  • Offers a more expressive and readable syntax for writing tests

Cons of Nimble

  • Lacks built-in snapshot testing capabilities (requires additional libraries)
  • May have a steeper learning curve for developers new to BDD-style testing
  • Potentially slower test execution compared to specialized snapshot testing tools

Code Comparison

ios-snapshot-test-case:

FBSnapshotVerifyView(view)
FBSnapshotVerifyLayer(layer)
FBSnapshotVerifyViewController(viewController)

Nimble (with Nimble-Snapshots):

expect(view).to(haveValidSnapshot())
expect(view).to(recordSnapshot())
expect(view).to(matchSnapshot(named: "custom_name"))

Summary

ios-snapshot-test-case is a specialized tool for snapshot testing in iOS, offering a straightforward API for comparing UI components. Nimble, on the other hand, is a more comprehensive testing framework that provides a wide range of matchers and a more expressive syntax. While Nimble requires additional setup for snapshot testing, it offers greater flexibility for various types of tests. The choice between the two depends on the specific needs of the project and the team's preferences for testing methodologies.

Common Xcode configuration files/settings.

Pros of xcconfigs

  • Focuses on Xcode configuration management, providing a set of reusable and customizable .xcconfig files
  • Helps maintain consistency across multiple Xcode projects and targets
  • Simplifies the process of managing build settings and configurations

Cons of xcconfigs

  • Limited to configuration management, lacking testing capabilities
  • Requires manual integration and setup in Xcode projects
  • May need additional customization for specific project requirements

Code Comparison

xcconfigs:

SWIFT_VERSION = 5.0
IPHONEOS_DEPLOYMENT_TARGET = 13.0
ENABLE_BITCODE = NO

ios-snapshot-test-case:

FBSnapshotVerifyView(view)
FBSnapshotVerifyLayer(layer)
FBSnapshotVerifyViewController(viewController)

Summary

xcconfigs is a repository focused on providing reusable Xcode configuration files, while ios-snapshot-test-case is a snapshot testing framework for iOS. xcconfigs offers better configuration management and consistency across projects, but lacks testing capabilities. ios-snapshot-test-case provides powerful snapshot testing tools but doesn't address configuration management. The choice between the two depends on whether the primary need is for configuration management or snapshot testing in iOS development.

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FBSnapshotTestCase

This project has a new name and home!

You can now find iOSSnapshotTestCase here.