swift-composable-architecture-mirror/Tests/ComposableArchitectureTests/TestStoreNonExhaustiveTests.swift

#if DEBUG
  import ComposableArchitecture
  import XCTest

  @MainActor
  final class TestStoreNonExhaustiveTests: BaseTCATestCase {
    func testSkipReceivedActions_NonStrict() async {
      let store = TestStore(initialState: 0) {
        Reduce<Int, Bool> { state, action in
          if action {
            state += 1
            return .send(false)
          } else {
            state += 1
            return .none
          }
        }
      }

      await store.send(true) { $0 = 1 }
      XCTAssertEqual(store.state, 1)
      await store.skipReceivedActions(strict: false)
      XCTAssertEqual(store.state, 2)
    }

    func testSkipReceivedActions_Strict() async {
      let store = TestStore(initialState: 0) {
        Reduce<Int, Bool> { state, action in
          if action {
            state += 1
            return .send(false)
          } else {
            state += 1
            return .none
          }
        }
      }

      await store.send(true) { $0 = 1 }
      XCTAssertEqual(store.state, 1)
      await store.receive(false) { $0 = 2 }
      XCTAssertEqual(store.state, 2)
      XCTExpectFailure {
        $0.compactDescription == "There were no received actions to skip."
      }
      await store.skipReceivedActions(strict: true)
    }

    func testSkipReceivedActions_NonExhaustive() async {
      let store = TestStore(initialState: 0) {
        Reduce<Int, Bool> { state, action in
          if action {
            state += 1
            return .send(false)
          } else {
            state += 1
            return .none
          }
        }
      }
      store.exhaustivity = .off

      await store.send(true) { $0 = 1 }
      XCTAssertEqual(store.state, 1)
      await store.skipReceivedActions(strict: false)
      XCTAssertEqual(store.state, 2)
    }

    func testSkipReceivedActions_PartialExhaustive() async {
      let store = TestStore(initialState: 0) {
        Reduce<Int, Bool> { state, action in
          if action {
            state += 1
            return .send(false)
          } else {
            state += 1
            return .none
          }
        }
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(true) { $0 = 1 }
      XCTAssertEqual(store.state, 1)
      await store.skipReceivedActions(strict: false)
      XCTAssertEqual(store.state, 2)
    }

    func testCancelInFlightEffects_NonStrict() async {
      let store = TestStore(initialState: 0) {
        Reduce<Int, Bool> { _, action in
          .run { _ in try await Task.sleep(nanoseconds: NSEC_PER_SEC) }
        }
      }

      await store.send(true)
      await store.skipInFlightEffects(strict: false)
    }

    func testCancelInFlightEffects_Strict() async {
      let store = TestStore(initialState: 0) {
        Reduce<Int, Bool> { _, action in
          .run { _ in }
        }
      }

      let task = await store.send(true)
      await task.finish(timeout: NSEC_PER_SEC / 2)
      XCTExpectFailure {
        $0.compactDescription == "There were no in-flight effects to skip."
      }
      await store.skipInFlightEffects(strict: true)
    }

    func testCancelInFlightEffects_NonExhaustive() async {
      let store = TestStore(initialState: 0) {
        Reduce<Int, Bool> { _, action in
          .run { _ in try await Task.sleep(nanoseconds: NSEC_PER_SEC) }
        }
      }
      store.exhaustivity = .off

      await store.send(true)
      await store.skipInFlightEffects(strict: false)
    }

    func testCancelInFlightEffects_PartialExhaustive() async {
      let store = TestStore(initialState: 0) {
        Reduce<Int, Bool> { _, action in
          .run { _ in try await Task.sleep(nanoseconds: NSEC_PER_SEC) }
        }
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(true)
      await store.skipInFlightEffects(strict: false)
    }

    // Confirms that you don't have to receive all actions before the test completes.
    func testIgnoreReceiveActions_PartialExhaustive() async {
      let store = TestStore(initialState: 0) {
        Reduce<Int, Bool> { _, action in
          action ? .send(false) : .none
        }
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(true)
    }

    // Confirms that you don't have to receive all actions before the test completes.
    func testIgnoreReceiveActions_NonExhaustive() async {
      let store = TestStore(initialState: 0) {
        Reduce<Int, Bool> { _, action in
          action ? .send(false) : .none
        }
      }
      store.exhaustivity = .off

      await store.send(true)
    }

    // Confirms that all effects do not need to complete before the test completes.
    func testIgnoreInFlightEffects_PartialExhaustive() async {
      let store = TestStore(initialState: 0) {
        Reduce<Int, Bool> { _, action in
          .run { _ in try await Task.sleep(nanoseconds: NSEC_PER_SEC) }
        }
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(true)
    }

    // Confirms that all effects do not need to complete before the test completes.
    func testIgnoreInFlightEffects_NonExhaustive() async {
      let store = TestStore(initialState: 0) {
        Reduce<Int, Bool> { _, action in
          .run { _ in try await Task.sleep(nanoseconds: NSEC_PER_SEC) }
        }
      }
      store.exhaustivity = .off

      await store.send(true)
    }

    // Confirms that you don't have to assert on all state changes in a non-exhaustive test store.
    func testNonExhaustiveSend_PartialExhaustive() async {
      let store = TestStore(initialState: Counter.State()) {
        Counter()
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(.increment) {
        $0.count = 1
        // Ignoring state change: isEven = false
      }
      await store.send(.increment) {
        $0.isEven = true
        // Ignoring state change: count = 2
      }
      await store.send(.increment) {
        $0.count = 3
        $0.isEven = false
      }
    }

    func testNonExhaustiveSend_PartialExhaustive_Prefix() async {
      let store = TestStore(initialState: Counter.State()) {
        Counter()
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(.increment) {
        $0.count = 1
        // Ignoring state change: isEven = false
      }
    }

    // Confirms that you don't have to assert on all state changes in a non-exhaustive test store,
    // *but* if you make an incorrect mutation you will still get a failure.
    func testNonExhaustiveSend_PartialExhaustive_BadAssertion() async {
      let store = TestStore(initialState: Counter.State()) {
        Counter()
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      #if DEBUG
        XCTExpectFailure {
          $0.compactDescription == """
            A state change does not match expectation: …

                  Counter.State(
                −   count: 0,
                +   count: 1,
                    isEven: false
                  )

            (Expected: −, Actual: +)
            """
        }
        await store.send(.increment) {
          $0.count = 0
        }
      #endif
    }

    // Confirms that you don't have to assert on all state changes in a non-exhaustive test store,
    // *and* that informational boxes of what was not asserted on is not shown.
    func testNonExhaustiveSend_NonExhaustive() async {
      let store = TestStore(initialState: Counter.State()) {
        Counter()
      }
      store.exhaustivity = .off

      await store.send(.increment) {
        $0.count = 1
        // Ignoring state change: isEven = false
      }
    }

    // Confirms that you can send actions without having received all effect actions in
    // non-exhaustive test stores.
    func testSend_SkipReceivedActions() async {
      struct State: Equatable {
        var count = 0
        var isLoggedIn = false
      }
      enum Action {
        case decrement
        case increment
        case loggedInResponse(Bool)
      }
      let store = TestStore(initialState: State()) {
        Reduce<State, Action> { state, action in
          switch action {
          case .decrement:
            state.count -= 1
            return .none
          case .increment:
            state.count += 1
            return .send(.loggedInResponse(true))
          case let .loggedInResponse(response):
            state.isLoggedIn = response
            return .none
          }
        }
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(.increment) {
        $0.count = 1
      }
      // Ignored received action: .loggedInResponse(true)
      await store.send(.decrement) {
        $0.count = 0
        // Ignored state change: isLoggedIn = true
      }
    }

    // Confirms that if you receive an action in a non-exhaustive test store with a bad assertion
    // you will still get a failure.
    func testSend_SkipReceivedActions_BadAssertion() async {
      struct State: Equatable {
        var count = 0
        var isLoggedIn = false
      }
      enum Action: Equatable {
        case increment
        case loggedInResponse(Bool)
      }
      let store = TestStore(initialState: State()) {
        Reduce<State, Action> { state, action in
          switch action {
          case .increment:
            state.count += 1
            return .send(.loggedInResponse(true))
          case let .loggedInResponse(response):
            state.isLoggedIn = response
            return .none
          }
        }
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(.increment) {
        $0.count = 1
      }
      XCTExpectFailure {
        $0.compactDescription == """
          A state change does not match expectation: …

                TestStoreNonExhaustiveTests.State(
              −   count: 2,
              +   count: 1,
                  isLoggedIn: true
                )

          (Expected: −, Actual: +)
          """
      }
      await store.receive(.loggedInResponse(true)) {
        $0.count = 2
        $0.isLoggedIn = true
      }
    }

    // Confirms that with non-exhaustive test stores you can send multiple actions without asserting
    // on any state changes until the very last action.
    func testMultipleSendsWithAssertionOnLast() async {
      let store = TestStore(initialState: Counter.State()) {
        Counter()
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(.increment)
      XCTAssertEqual(store.state, Counter.State(count: 1, isEven: false))

      await store.send(.increment)
      XCTAssertEqual(store.state, Counter.State(count: 2, isEven: true))

      await store.send(.increment) {
        $0.count = 3
      }
      XCTAssertEqual(store.state, Counter.State(count: 3, isEven: false))
    }

    // Confirms that you don't have to assert on all state changes when receiving an action from an
    // effect in a non-exhaustive test store.
    func testReceive_StateChange() async {
      let store = TestStore(initialState: NonExhaustiveReceive.State()) {
        NonExhaustiveReceive()
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(.onAppear)
      XCTAssertEqual(store.state, NonExhaustiveReceive.State(count: 0, int: 0, string: ""))

      await store.receive(.response1(42)) {
        // Ignored state change: count = 1
        $0.int = 42
      }
      XCTAssertEqual(store.state, NonExhaustiveReceive.State(count: 1, int: 42, string: ""))

      await store.receive(.response2("Hello")) {
        // Ignored state change: count = 2
        $0.string = "Hello"
      }
      XCTAssertEqual(store.state, NonExhaustiveReceive.State(count: 2, int: 42, string: "Hello"))
    }

    // Confirms that you can skip receiving certain effect actions in a non-exhaustive test store.
    func testReceive_SkipAction() async {
      let store = TestStore(initialState: NonExhaustiveReceive.State()) {
        NonExhaustiveReceive()
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(.onAppear)
      XCTAssertEqual(store.state, NonExhaustiveReceive.State(count: 0, int: 0, string: ""))

      // Ignored received action: .response1(42)

      await store.receive(.response2("Hello")) {
        $0.count = 2
        $0.string = "Hello"
      }
      XCTAssertEqual(store.state, NonExhaustiveReceive.State(count: 2, int: 42, string: "Hello"))
    }

    // Confirms that you are allowed to send actions without having received all actions queued
    // from effects.
    func testSendWithUnreceivedAction() async {
      let store = TestStore(initialState: NonExhaustiveReceive.State()) {
        NonExhaustiveReceive()
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(.onAppear)
      // Ignored received action: .response1(42)
      // Ignored received action: .response2("Hello")

      await store.send(.onAppear)
      // Ignored received action: .response1(42)
      // Ignored received action: .response2("Hello")
    }

    // Confirms that when you send an action the test store skips any unreceived actions
    // automatically.
    func testSendWithUnreceivedActions_SkipsActions() async {
      enum Action: Equatable {
        case tap
        case response(Int)
      }
      let store = TestStore(initialState: 0) {
        Reduce<Int, Action> { state, action in
          switch action {
          case .tap:
            state += 1
            return .run { [state] send in await send(.response(state + 42)) }
          case let .response(number):
            state = number
            return .none
          }
        }
      }
      store.exhaustivity = .off

      await store.send(.tap)
      XCTAssertEqual(store.state, 1)

      // Ignored received action: .response(43)
      await store.send(.tap)
      XCTAssertEqual(store.state, 44)

      await store.skipReceivedActions()
      XCTAssertEqual(store.state, 86)
    }

    func testPartialExhaustivityPrefix() async {
      let testScheduler = DispatchQueue.test
      enum Action {
        case buttonTapped
        case response(Int)
      }
      let store = TestStore(initialState: 0) {
        Reduce<Int, Action> { state, action in
          switch action {
          case .buttonTapped:
            state += 1
            return .run { send in
              await send(.response(42))
              try await testScheduler.sleep(for: .seconds(1))
              await send(.response(1729))
            }
          case let .response(number):
            state = number
            return .none
          }
        }
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(.buttonTapped)
      // Ignored state mutation: state = 1
      // Ignored received action: .response(42)
      await testScheduler.advance(by: .milliseconds(500))
      await store.send(.buttonTapped) {
        $0 = 43
      }

      await testScheduler.advance(by: .milliseconds(500))
      await store.skipInFlightEffects()
      await store.skipReceivedActions()
      // Ignored received action: .response(42)
      // Ignored received action: .response(1729)
      // Ignore in-flight effect
    }

    func testCasePathReceive_PartialExhaustive() async {
      let store = TestStore(initialState: NonExhaustiveReceive.State()) {
        NonExhaustiveReceive()
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(.onAppear)
      await store.receive(\.response1) {
        $0.int = 42
      }
      await store.receive(\.response2) {
        $0.string = "Hello"
      }
    }

    func testCasePathReceive_NonExhaustive() async {
      let store = TestStore(initialState: NonExhaustiveReceive.State()) {
        NonExhaustiveReceive()
      }
      store.exhaustivity = .off

      await store.send(.onAppear)
      await store.receive(\.response1) {
        $0.int = 42
      }
      await store.receive(\.response2) {
        $0.string = "Hello"
      }
    }

    func testCasePathReceive_Exhaustive() async {
      let store = TestStore(initialState: NonExhaustiveReceive.State()) {
        NonExhaustiveReceive()
      }

      await store.send(.onAppear)
      await store.receive(\.response1) {
        $0.count = 1
        $0.int = 42
      }
      await store.receive(\.response2) {
        $0.count = 2
        $0.string = "Hello"
      }
    }

    func testCasePathReceive_Exhaustive_NonEquatable() async {
      let store = TestStore(initialState: 0) {
        Reduce<Int, NonEquatableAction> { state, action in
          switch action {
          case .tap:
            return .send(.response(NonEquatable()))
          case .response:
            return .none
          }
        }
      }

      await store.send(.tap)
      await store.receive(\.response)
    }

    func testPredicateReceive_Exhaustive_NonEquatable() async {
      struct NonEquatable {}
      enum Action {
        case tap
        case response(NonEquatable)
      }

      let store = TestStore(initialState: 0) {
        Reduce<Int, Action> { state, action in
          switch action {
          case .tap:
            return .send(.response(NonEquatable()))
          case .response:
            return .none
          }
        }
      }

      await store.send(.tap)
      await store.receive { if case .response = $0 { return true } else { return false } }
    }

    func testCasePathReceive_SkipReceivedAction() async {
      let store = TestStore(initialState: NonExhaustiveReceive.State()) {
        NonExhaustiveReceive()
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(.onAppear)
      await store.receive(\.response2) {
        $0.string = "Hello"
      }
    }

    func testCasePathReceive_WrongAction() async {
      let store = TestStore(initialState: NonExhaustiveReceive.State()) {
        NonExhaustiveReceive()
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(.onAppear)

      XCTExpectFailure {
        $0.compactDescription == """
          Expected to receive an action matching case path, but didn't get one.
          """
      }

      await store.receive(\.onAppear)
      await store.receive(\.response1)
      await store.receive(\.response2)
    }

    func testCasePathReceive_ReceivedExtraAction() async {
      let store = TestStore(initialState: NonExhaustiveReceive.State()) {
        NonExhaustiveReceive()
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(.onAppear)
      await store.receive(\.response2)

      XCTExpectFailure {
        $0.compactDescription == """
          Expected to receive an action matching case path, but didn't get one.
          """
      }

      await store.receive(\.response2)
    }

    func testXCTModifyExhaustive() async {
      struct State: Equatable {
        var child: Int? = 0
        var count = 0
      }
      enum Action: Equatable { case tap, response }
      let store = TestStore(initialState: State()) {
        Reduce<State, Action> { state, action in
          switch action {
          case .tap:
            state.count += 1
            return .send(.response)
          case .response:
            state.count += 1
            return .none
          }
        }
      }

      await store.send(.tap) { state in
        state.count = 1
        XCTExpectFailure {
          XCTModify(&state.child) { _ in }
        } issueMatcher: {
          $0.compactDescription == """
            XCTModify failed: expected "Int" value to be modified but it was unchanged.
            """
        }
      }
      await store.receive(.response) { state in
        state.count = 2
        XCTExpectFailure {
          XCTModify(&state.child) { _ in }
        } issueMatcher: {
          $0.compactDescription == """
            XCTModify failed: expected "Int" value to be modified but it was unchanged.
            """
        }
      }
    }

    func testXCTModifyNonExhaustive() async {
      enum Action { case tap, response }
      let store = TestStore(initialState: Optional(1)) {
        Reduce<Int?, Action> { state, action in
          switch action {
          case .tap:
            return .send(.response)
          case .response:
            return .none
          }
        }
      }
      store.exhaustivity = .off

      await store.send(.tap) {
        XCTModify(&$0) { _ in }
      }
      await store.receive(.response) {
        XCTModify(&$0) { _ in }
      }
    }

    func testReceiveNonExhaustiveWithTimeout() async {
      struct State: Equatable {}
      enum Action: Equatable { case tap, response1, response2 }

      let store = TestStore(initialState: State()) {
        Reduce<State, Action> { state, action in
          switch action {
          case .tap:
            return .run { send in
              try await Task.sleep(nanoseconds: 10_000_000)
              await send(.response1)
              try await Task.sleep(nanoseconds: 10_000_000)
              await send(.response2)
            }
          case .response1, .response2:
            return .none
          }
        }
      }
      store.exhaustivity = .off

      await store.send(.tap)
      await store.receive(.response2, timeout: 1_000_000_000)
    }

    func testReceiveNonExhaustiveWithTimeoutMultipleNonMatching() async {
      struct State: Equatable {}
      enum Action: Equatable { case tap, response1, response2 }
      let store = TestStore(initialState: State()) {
        Reduce<State, Action> { state, action in
          switch action {
          case .tap:
            return .run { send in
              try await Task.sleep(nanoseconds: 10_000_000)
              await send(.response1)
              try await Task.sleep(nanoseconds: 10_000_000)
              await send(.response1)
            }
          case .response1:
            return .none
          case .response2:
            return .none
          }
        }
      }
      store.exhaustivity = .off

      await store.send(.tap)
      XCTExpectFailure { issue in
        issue.compactDescription.contains(
          """
          Expected to receive a matching action, but received none after 1.0 seconds.
          """)
          || (issue.compactDescription.contains(
            "Expected to receive the following action, but didn't")
            && issue.compactDescription.contains("Action.response2"))
      }
      await store.receive(.response2, timeout: 1_000_000_000)
    }

    func testReceiveNonExhaustiveWithTimeoutMultipleMatching() async {
      struct State: Equatable {}
      enum Action: Equatable { case tap, response1, response2 }
      let store = TestStore(initialState: State()) {
        Reduce<State, Action> { state, action in
          switch action {
          case .tap:
            return .run { send in
              try await Task.sleep(nanoseconds: 10_000_000)
              await send(.response2)
              try await Task.sleep(nanoseconds: 10_000_000)
              await send(.response2)
            }
          case .response1, .response2:
            return .none
          }
        }
      }
      store.exhaustivity = .off

      await store.send(.tap)
      await store.receive(.response2, timeout: 1_000_000_000)
      await store.receive(.response2, timeout: 1_000_000_000)
    }

    func testNonExhaustive_ShowSkippedAssertions_ExpectedStateToChange() async {
      let store = TestStore(initialState: 0) {
        Reduce<Int, Void> { _, _ in .none }
      }
      store.exhaustivity = .off(showSkippedAssertions: true)
      await store.send(()) { $0 = 0 }
      store.assert { $0 = 0 }
    }

    // This example comes from Krzysztof Zabłocki's blog post:
    // https://www.merowing.info/exhaustive-testing-in-tca/
    func testKrzysztofExample1() async {
      let store = TestStore(initialState: KrzysztofExample.State()) {
        KrzysztofExample()
      }
      store.exhaustivity = .off

      await store.send(.changeIdentity(name: "Marek", surname: "Ignored")) {
        $0.name = "Marek"
      }
    }

    // This example comes from Krzysztof Zabłocki's blog post:
    // https://www.merowing.info/exhaustive-testing-in-tca/
    func testKrzysztofExample2() async {
      let store = TestStore(initialState: KrzysztofExample.State()) {
        KrzysztofExample()
      }
      store.exhaustivity = .off

      await store.send(.changeIdentity(name: "Adam", surname: "Stern"))
      await store.send(.changeIdentity(name: "Piotr", surname: "Galiszewski"))
      await store.send(.changeIdentity(name: "Merowing", surname: "Info")) {
        $0.name = "Merowing"
        $0.surname = "Info"
      }
    }

    // This example comes from Krzysztof Zabłocki's blog post:
    // https://www.merowing.info/exhaustive-testing-in-tca/
    func testKrzysztofExample3() async {
      let mainQueue = DispatchQueue.test

      let store = TestStore(initialState: KrzysztofExample.State()) {
        KrzysztofExample()
      } withDependencies: {
        $0.mainQueue = mainQueue.eraseToAnyScheduler()
      }
      store.exhaustivity = .off

      await store.send(.advanceAgeAndMoodAfterDelay)
      await mainQueue.advance(by: 1)
      await store.receive(.changeAge(34)) {
        $0.age = 34
      }
      XCTAssertEqual(store.state.age, 34)
    }

    func testEffectfulAssertion_NonExhaustiveTestStore_ShowSkippedAssertions() async {
      struct Model: Equatable {
        let id: UUID
        init() {
          @Dependency(\.uuid) var uuid
          self.id = uuid()
        }
      }
      struct State: Equatable {
        var values: [Model] = []
      }
      enum Action {
        case addButtonTapped
      }

      XCTTODO(
        """
        This test should pass once we have the concept of "copyable" dependencies.
        """
      )

      let store = TestStore(initialState: State()) {
        Reduce<State, Action> { state, action in
          switch action {
          case .addButtonTapped:
            state.values.append(Model())
            return .none
          }
        }
      } withDependencies: {
        $0.uuid = .incrementing
      }
      store.exhaustivity = .off(showSkippedAssertions: true)

      await store.send(.addButtonTapped) {
        $0.values.insert(Model(), at: 0)
      }
      await store.send(.addButtonTapped) {
        $0.values.insert(Model(), at: 1)
      }
    }
  }

  @Reducer
  struct Counter {
    struct State: Equatable {
      var count = 0
      var isEven = true
    }
    enum Action {
      case increment
      case decrement
    }
    var body: some Reducer<State, Action> {
      Reduce { state, action in
        switch action {
        case .increment:
          state.count += 1
          state.isEven.toggle()
          return .none
        case .decrement:
          state.count -= 1
          state.isEven.toggle()
          return .none
        }
      }
    }
  }

  @Reducer
  struct NonExhaustiveReceive {
    struct State: Equatable {
      var count = 0
      var int = 0
      var string = ""
    }
    @dynamicMemberLookup
    enum Action: Equatable {
      case onAppear
      case response1(Int)
      case response2(String)
    }
    var body: some Reducer<State, Action> {
      Reduce { state, action in
        switch action {
        case .onAppear:
          state = State()
          return .merge(
            .send(.response1(42)),
            .send(.response2("Hello"))
          )
        case let .response1(int):
          state.count += 1
          state.int = int
          return .none
        case let .response2(string):
          state.count += 1
          state.string = string
          return .none
        }
      }
    }
  }

  // This example comes from Krzysztof Zabłocki's blog post:
  // https://www.merowing.info/exhaustive-testing-in-tca/
  @Reducer
  struct KrzysztofExample {
    struct State: Equatable {
      var name: String = "Krzysztof"
      var surname: String = "Zabłocki"
      var age: Int = 33
      var mood: Int = 0
    }
    enum Action: Equatable {
      case changeIdentity(name: String, surname: String)
      case changeAge(Int)
      case changeMood(Int)
      case advanceAgeAndMoodAfterDelay
    }

    @Dependency(\.mainQueue) var mainQueue

    var body: some Reducer<State, Action> {
      Reduce { state, action in
        switch action {
        case let .changeIdentity(name, surname):
          state.name = name
          state.surname = surname
          return .none

        case .advanceAgeAndMoodAfterDelay:
          return .run { [state] send in
            try await self.mainQueue.sleep(for: .seconds(1))
            async let changeAge: () = send(.changeAge(state.age + 1))
            async let changeMood: () = send(.changeMood(state.mood + 1))
            _ = await (changeAge, changeMood)
          }

        case let .changeAge(age):
          state.age = age
          return .none
        case let .changeMood(mood):
          state.mood = mood
          return .none
        }
      }
    }
  }

  private struct NonEquatable {}
  @CasePathable
  @dynamicMemberLookup
  private enum NonEquatableAction {
    case tap
    case response(NonEquatable)
  }
#endif