public async Task WhenAllMatchesFound_GameEnds()
{
var model = new MemoryGameModel(0);
var distinctAnimals = model.ShuffledCards.Select(c => c).Distinct().ToList();
var expectedMatchCount = 0;
// Select each pair in turn
foreach (var animal in distinctAnimals)
{
Assert.False(model.GameEnded);
Assert.False(model.LatestCompletionTime.HasValue);
var matchingCards = model.ShuffledCards.Where(c => c == animal).ToList();
Assert.Equal(2, matchingCards.Count);
await model.SelectCardAsync(matchingCards[0]);
await model.SelectCardAsync(matchingCards[1]);
Assert.True(matchingCards[0].IsMatched);
Assert.True(matchingCards[1].IsMatched);
Assert.Equal(++expectedMatchCount, model.MatchesFound);
}
// Finally, the game should be completed
Assert.True(model.GameEnded);
Assert.True(model.LatestCompletionTime.HasValue);
}
public async Task WhenUserSelectsNonMatchingPair_TurnsBothBack()
{
// Find a non-matching pair
var model = new MemoryGameModel(0);
var firstSelection = model.ShuffledCards[0];
var secondSelection = model.ShuffledCards
.First(c => c != firstSelection);
// Select first one
await model.SelectCardAsync(firstSelection);
Assert.True(firstSelection.IsTurned);
// Select second one - everything resets
await model.SelectCardAsync(secondSelection);
Assert.False(firstSelection.IsTurned);
Assert.False(secondSelection.IsTurned);
Assert.False(firstSelection.IsMatched);
Assert.False(firstSelection.IsMatched);
Assert.Equal(0, model.MatchesFound);
}
public async Task WhenUserSelectsMatchingPair_StaysMatched()
{
// Find a non-matching pair
var model = new MemoryGameModel(0);
var firstSelection = model.ShuffledCards[0];
var secondSelection = model.ShuffledCards.Skip(1)
.Single(c => c == firstSelection);
// Select first one
await model.SelectCardAsync(firstSelection);
Assert.True(firstSelection.IsTurned);
Assert.Equal(0, model.MatchesFound);
// Select second one - everything resets
await model.SelectCardAsync(secondSelection);
Assert.True(firstSelection.IsTurned);
Assert.True(secondSelection.IsTurned);
Assert.True(firstSelection.IsMatched);
Assert.True(secondSelection.IsMatched);
Assert.Equal(1, model.MatchesFound);
Assert.False(model.GameEnded);
}
public void StartsWithAllCardsFaceDown()
{
var model = new MemoryGameModel(0);
Assert.All(model.ShuffledCards, card => Assert.False(card.IsTurned));
}
public void StartsWithZeroMatches()
{
var model = new MemoryGameModel(0);
Assert.Equal(0, model.MatchesFound);
}
