SwiftUI Unit tests

up:: SwiftUI onboarding

• Unit tests are in a separate target. They don’t get compiled and sent to the App Store
  • New > Target > Unit Testing Bundle
• New file: Unit test class file
  • For each View, create a new test file
• Each function must start with test
  • naming structure: test_UnitOfWork_StateUnderTest_ExpectedBehaviour
    • eg: test_UserListViewModel_isPremium_shouldBeTrue
  • testing structure:
    • Given
    • When
    • Then

@testable import MyApp // because we are in a different target, need to import app
 
func test_UserListViewModel_isPremium_shouldBeTrue() throws {
	// Given
	let userIsPremium: Bool = true
 
	// When
	let vm = UserListViewModel(isPremium: userIsPremium)
 
	// Then
	XCTAssertTrue(vm.isPremium)
}