public void GetCoinsAmountShouldProvideCorrectResult()
{
var wallet = new Wallet();
var result = wallet.GetCoinsAmount();
Assert.AreEqual(0, result.Count, "Empty dictionary is expected");
wallet.Push(new Coin(1));
result = wallet.GetCoinsAmount();
Assert.AreEqual(1, result.Count, "Invalid result is provided for single coin");
wallet.Push(new Coin(1));
wallet.Push(new Coin(2));
wallet.Push(new Coin(2));
wallet.Pop(new Coin(1));
var expectedCoin = new Coin(1);
result = wallet.GetCoinsAmount();
Assert.AreEqual(2, result.Count);
Assert.AreEqual(1, result[expectedCoin], "Invalid {0} coins amount", expectedCoin);
expectedCoin = new Coin(2);
Assert.AreEqual(2, result[expectedCoin], "Invalid {0} coins amount", expectedCoin);
}