My unit testing file for Matching Game

matching_game_tests.dart

import 'package:exam1_emoji_matching/emoji_matching_game.dart';
import 'package:test/test.dart';

void main() {
  late MatchingGame game3;
  late MatchingGame game5;
  late MatchingGame game10;
  setUp(() {
    game3 = MatchingGame(3);
    game10 = MatchingGame(10);
    game5 = MatchingGame(5);
    game5.cards = "🚁,🐴,🐇,🐢,🐱,🚁,🐴,🐇,🐢,🐱".split(",");
  });
  test("Constructor", () {
    // Cards random (hard to test values)
    expect(game3.cards.length, 6);
    expect(game10.cards.length, 20);

    // Card States
    expect(game3.cardStates.length, 6);
    expect(game10.cardStates.length, 20);
    for (int k = 0; k < 6; k++) {
      expect(game3.cardStates[k], CardState.hidden);
    }
    for (int k = 0; k < 20; k++) {
      expect(game10.cardStates[k], CardState.hidden);
    }

    // Card back selection (comes form this list)
    expect(game10.allCardBacks.contains(game10.cardBack), true);
  });
  test("Before Press 1", () {
    expect(game5.cardStates[0], CardState.hidden);
    expect(game5.cardStates[1], CardState.hidden);
    expect(game5.cardStates[2], CardState.hidden);
    expect(game5.cardStates[9], CardState.hidden);
    expect(game5.state, GameState.waitingForFirstSelection);
  });
  test("Press 1", () {
    game5.pressedCard(index: 1);
    expect(game5.cardStates[0], CardState.hidden);
    expect(game5.cardStates[1], CardState.shown);
    expect(game5.cardStates[2], CardState.hidden);
    expect(game5.cardStates[9], CardState.hidden);
    expect(game5.state, GameState.waitingForSecondSelection);
    expect(game5.firstSelection, 1);
  });

  test("Press 2, no match", () {
    game5.pressedCard(index: 1);
    game5.pressedCard(index: 2);
    expect(game5.cardStates[0], CardState.hidden);
    expect(game5.cardStates[1], CardState.shown);
    expect(game5.cardStates[2], CardState.shown);
    expect(game5.cardStates[9], CardState.hidden);
    expect(game5.state, GameState.turnComplete);
    expect(game5.firstSelection, 1);
    expect(game5.secondSelection, 2);
    game5.startNewTurn();
    expect(game5.cardStates[0], CardState.hidden);
    expect(game5.cardStates[1], CardState.hidden);
    expect(game5.cardStates[2], CardState.hidden);
    expect(game5.cardStates[9], CardState.hidden);
    expect(game5.state, GameState.waitingForFirstSelection);
  });

  test("Press 2, match!", () {
    game5.pressedCard(index: 1);
    game5.pressedCard(index: 6);
    expect(game5.cardStates[0], CardState.hidden);
    expect(game5.cardStates[1], CardState.shown);
    expect(game5.cardStates[6], CardState.shown);
    expect(game5.cardStates[9], CardState.hidden);
    expect(game5.state, GameState.turnComplete);
    expect(game5.firstSelection, 1);
    expect(game5.secondSelection, 6);
    game5.startNewTurn();
    expect(game5.cardStates[0], CardState.hidden);
    expect(game5.cardStates[1], CardState.removed);
    expect(game5.cardStates[6], CardState.removed);
    expect(game5.cardStates[9], CardState.hidden);
    expect(game5.state, GameState.waitingForFirstSelection);
  });

  test("Completed 2 matches", () {
    game5.pressedCard(index: 1);
    game5.pressedCard(index: 6);
    game5.startNewTurn();
    game5.pressedCard(index: 0);
    game5.pressedCard(index: 5);
    game5.startNewTurn();
    const removedIndexes = [0, 1, 5, 6];
    for (int k = 0; k < game5.cardStates.length; k++) {
      expect(game5.cardStates[k],
          (removedIndexes.contains(k)) ? CardState.removed : CardState.hidden);
    }
    expect(game5.state, GameState.waitingForFirstSelection);
  });

  test("Completed 4 matches", () {
    for (int k = 0; k < 4; k++) {
      game5.pressedCard(index: k);
      game5.pressedCard(index: k + 5);
      game5.startNewTurn();
    }
    const removedIndexes = [0, 1, 2, 3, 5, 6, 7, 8];
    for (int k = 0; k < game5.cardStates.length; k++) {
      expect(game5.cardStates[k],
          (removedIndexes.contains(k)) ? CardState.removed : CardState.hidden);
    }
    expect(game5.state, GameState.waitingForFirstSelection);
  });

  test("Completed all matches", () {
    for (int k = 0; k < 5; k++) {
      game5.pressedCard(index: k);
      game5.pressedCard(index: k + 5);
      game5.startNewTurn();
    }
    for (int k = 0; k < game5.cardStates.length; k++) {
      expect(game5.cardStates[k], CardState.removed);
    }
    expect(game5.state, GameState.gameOver);
  });

  test("foolish second press - same card twice", () {
    game3.pressedCard(index: 1);
    game3.pressedCard(index: 1);
    expect(game3.cardStates[0], CardState.hidden);
    expect(game3.cardStates[1], CardState.shown);
    expect(game3.cardStates[2], CardState.hidden);
    expect(game3.cardStates[3], CardState.hidden);
    expect(game3.cardStates[4], CardState.hidden);
    expect(game3.cardStates[5], CardState.hidden);
    expect(game3.state, GameState.waitingForSecondSelection);
    expect(game3.firstSelection, 1);
    game3.startNewTurn(); // At an invalid time.  Ignored.
    expect(game3.state, GameState.waitingForSecondSelection);
  });

  test("foolish press - removed card", () {
    game5.pressedCard(index: 3);
    game5.pressedCard(index: 8);
    game5.startNewTurn();
    expect(game5.state, GameState.waitingForFirstSelection);
    game5.startNewTurn(); // Invalid time ignored.
    game5.pressedCard(index: 3);
    expect(game5.state, GameState.waitingForFirstSelection);
    game5.startNewTurn(); // Invalid time ignored.
    game5.pressedCard(index: 8);
    expect(game5.state, GameState.waitingForFirstSelection);
  });
}