Add CopyTo tests for all sets

Tests/Singulink.Globalization.Currency.Tests/Sets/CopyTo.cs

@@ -0,0 +1,52 @@
+namespace Singulink.Globalization.Tests.Sets;
+public static class CopyTo
+{
+    [PrefixTestClass]
+    public class TMoneySet : Tests<MoneySet>;
+
+    [PrefixTestClass]
+    public class TSortedMoneySet : Tests<SortedMoneySet>;
+
+    [PrefixTestClass]
+    public class TImmutableMoneySet : Tests<ImmutableMoneySet>;
+
+    [PrefixTestClass]
+    public class TImmutableSortedMoneySet : Tests<ImmutableSortedMoneySet>;
+
+    public class Tests<T> where T : IReadOnlyMoneySet
+    {
+        private static readonly Money Usd100 = new(100m, "USD");
+        private static readonly Money Cad50 = new(50m, "CAD");
+        private static readonly Money Eur25 = new(25m, "EUR");
+
+        private readonly IReadOnlyMoneySet _set = T.Create(CurrencyRegistry.Default, [Usd100, Cad50, Eur25]);
+
+        [TestMethod]
+        public void DestinationSufficientSize_Successful()
+        {
+            var array = new Money[3];
+
+            ((ICollection<Money>)_set).CopyTo(array, 0);
+            array.ShouldBe([Usd100, Cad50, Eur25], ignoreOrder: true);
+
+            array = new Money[10];
+
+            ((ICollection<Money>)_set).CopyTo(array, 5);
+
+            array.Take(5).ShouldAllBe(m => m.IsDefault);
+            array.Skip(5).Take(3).ShouldBe([Usd100, Cad50, Eur25], ignoreOrder: true);
+            array.Skip(8).ShouldAllBe(m => m.IsDefault);
+        }
+
+        [TestMethod]
+        public void DestinationInsufficientSize_Successful()
+        {
+            var array = new Money[2];
+            Should.Throw<ArgumentException>(() => ((ICollection<Money>)_set).CopyTo(array, 1));
+            Should.Throw<ArgumentOutOfRangeException>(() => ((ICollection<Money>)_set).CopyTo(array, 15));
+
+            array = new Money[10];
+            Should.Throw<ArgumentException>(() => ((ICollection<Money>)_set).CopyTo(array, 8));
+        }
+    }
+}