1 files changed, 59 insertions, 0 deletions
diff --git a/tests/Jellyfin.Extensions.Tests/CopyToExtensionsTests.cs b/tests/Jellyfin.Extensions.Tests/CopyToExtensionsTests.cs
new file mode 100644
index 000000000..d46beedd9
--- /dev/null
+++ b/tests/Jellyfin.Extensions.Tests/CopyToExtensionsTests.cs
@@ -0,0 +1,59 @@
+using System;
+using System.Collections.Generic;
+using Xunit;
+
+namespace Jellyfin.Extensions.Tests
+{
+    public static class CopyToExtensionsTests
+    {
+        public static TheoryData<IReadOnlyList<int>, IList<int>, int, IList<int>> CopyTo_Valid_Correct_TestData()
+        {
+            var data = new TheoryData<IReadOnlyList<int>, IList<int>, int, IList<int>>();
+
+            data.Add(
+                new[] { 0, 1, 2, 3, 4, 5 }, new[] { 0, 0, 0, 0, 0, 0 }, 0, new[] { 0, 1, 2, 3, 4, 5 });
+
+            data.Add(
+                new[] { 0, 1, 2 }, new[] { 5, 4, 3, 2, 1, 0 }, 2, new[] { 5, 4, 0, 1, 2, 0 } );
+
+            return data;
+        }
+
+        [Theory]
+        [MemberData(nameof(CopyTo_Valid_Correct_TestData))]
+        public static void CopyTo_Valid_Correct<T>(IReadOnlyList<T> source, IList<T> destination, int index, IList<T> expected)
+        {
+            source.CopyTo(destination, index);
+            Assert.Equal(expected, destination);
+        }
+
+        public static TheoryData<IReadOnlyList<int>, IList<int>, int> CopyTo_Invalid_ThrowsArgumentOutOfRangeException_TestData()
+        {
+            var data = new TheoryData<IReadOnlyList<int>, IList<int>, int>();
+
+            data.Add(
+                new[] { 0, 1, 2, 3, 4, 5 }, new[] { 0, 0, 0, 0, 0, 0 }, -1 );
+
+            data.Add(
+                new[] { 0, 1, 2 }, new[] { 5, 4, 3, 2, 1, 0 }, 6 );
+
+            data.Add(
+                new[] { 0, 1, 2 }, Array.Empty<int>(), 0 );
+
+            data.Add(
+                new[] { 0, 1, 2, 3, 4, 5 }, new[] { 0 }, 0 );
+
+            data.Add(
+                new[] { 0, 1, 2, 3, 4, 5 }, new[] { 0, 0, 0, 0, 0, 0 }, 1 );
+
+            return data;
+        }
+
+        [Theory]
+        [MemberData(nameof(CopyTo_Invalid_ThrowsArgumentOutOfRangeException_TestData))]
+        public static void CopyTo_Invalid_ThrowsArgumentOutOfRangeException<T>(IReadOnlyList<T> source, IList<T> destination, int index)
+        {
+            Assert.Throws<ArgumentOutOfRangeException>(() => source.CopyTo(destination, index));
+        }
+    }
+}