hanjustin / xctestmashup

Used dependency injection and mocking to utilize XCTest and Xcode CLI to automate testing

XCTest unit testing

• Core Data: Improvement of Singleton pattern by creating testing static variable.

  struct PersistentStore {
      static var shared: PersistentStore
      static var testing: PersistentStore
  }

• UserDefaults: Subclass to create mock

  class MockUserDefaults: UserDefaults {
  
  }

• Networking Layer: Protocol + Mock class

  protocol DataServiceProtocol {
  
  }
  
  class MockService: DataServiceProtocol {
  
  }

• Other features

  • Test plans
    • UnitTests.xctestplan: Unit tests only
    • FullTests.xctestplan: Unit tests + UI test
  • Code coverage

Xcode CLI

1. Build generate Build products & .xctestrun manifest file

   xcodebuild build-for-testing -scheme XCTestMashup -destination 'platform=iOS Simulator,OS=16.4,name=iPhone 14'
   

2. Test using the above generated files to create Result Bundle. (Need to enter path)

   xcodebuild test-without-building -xctestrun "ENTER_PATH_HERE_FOR_XCTESTRUN Xcode/DerivedData/XCTest_Mashup.xctestrun" -destination 'platform=iOS Simulator,OS=16.4,name=iPhone 14'
   

3. Display JSON format of Result Bundle containing Build log, Test report, Code coverage report, Test attachments

   xcrun xcresulttool get --path ResultBundle.xcresult --format json
   

The above steps could be used as the main steps for CI

Other commands:

Build & Test

xcodebuild test -project XCTestMashup.xcodeproj -scheme XCTestMashup -destination 'platform=iOS Simulator,OS=16.4,name=iPhone 14'

Testing on Multiple Destinations

xcodebuild test -scheme XCTestMashup -destination 'platform=iOS Simulator,OS=16.4,name=iPhone 14' -destination 'platform=iOS Simulator,OS=16.4,name=iPad (10th generation)'

Produce Result Bundles

xcodebuild test -scheme XCTestMashup -resultBundlePath $PWD/testresult/ResultBundle.xcresult -destination 'platform=iOS Simulator,OS=16.4,name=iPhone 14'

Code Coverage Reports with xccov

xcrun xccov view --report ResultBundle.xcresult