public void ChangeTest()
{
var s = new Solution();
int amount, expected;
int[] coins;
amount = 5;
coins = new int[] { 1, 2, 5 };
expected = 4;
Assert.Equal(expected, s.Change(amount, coins));
amount = 3;
coins = new int[] { 2 };
expected = 0;
Assert.Equal(expected, s.Change(amount, coins));
amount = 10;
coins = new int[] { 10 };
expected = 1;
Assert.Equal(expected, s.Change(amount, coins));
}