swift-composable-architecture-mirror/Examples/CaseStudies/SwiftUICaseStudiesTests/04-HigherOrderReducers-LifecycleTests.swift

import Combine
import ComposableArchitecture
import XCTest

@testable import SwiftUICaseStudies

class LifecycleTests: XCTestCase {
  func testLifecycle() {
    let scheduler = DispatchQueue.test

    let store = TestStore(
      initialState: .init(),
      reducer: lifecycleDemoReducer,
      environment: .init(
        mainQueue: scheduler.eraseToAnyScheduler()
      )
    )

    store.send(.toggleTimerButtonTapped) {
      $0.count = 0
    }

    store.send(.timer(.onAppear))

    scheduler.advance(by: .seconds(1))
    store.receive(.timer(.action(.tick))) {
      $0.count = 1
    }

    scheduler.advance(by: .seconds(1))
    store.receive(.timer(.action(.tick))) {
      $0.count = 2
    }

    store.send(.timer(.action(.incrementButtonTapped))) {
      $0.count = 3
    }

    store.send(.timer(.action(.decrementButtonTapped))) {
      $0.count = 2
    }

    store.send(.toggleTimerButtonTapped) {
      $0.count = nil
    }

    store.send(.timer(.onDisappear))
  }
}