1 files changed, 42 insertions, 0 deletions
diff --git a/src/Godosa.Core.Tests/Input/MenuCursorTests.cs b/src/Godosa.Core.Tests/Input/MenuCursorTests.cs
new file mode 100644
index 0000000..79a1184
--- /dev/null
+++ b/src/Godosa.Core.Tests/Input/MenuCursorTests.cs
@@ -0,0 +1,42 @@
+using Godosa.Core.Input;
+using Xunit;
+
+namespace Godosa.Core.Tests.Input;
+
+public class MenuCursorTests
+{
+    [Fact]
+    public void Move_WrapsAround()
+    {
+        var c = new MenuCursor();
+        c.Clamp(3);
+
+        c.Move(-1, 3);
+        Assert.Equal(2, c.Index);
+        c.Move(+1, 3);
+        Assert.Equal(0, c.Index);
+        c.Move(+1, 3);
+        Assert.Equal(1, c.Index);
+    }
+
+    [Fact]
+    public void Clamp_KeepsIndexInsideAShrinkingList_AndEmptyMeansNone()
+    {
+        var c = new MenuCursor();
+        c.Clamp(5);
+        c.Move(+1, 5);
+        c.Move(+1, 5);
+        c.Move(+1, 5);
+
+        c.Clamp(2);
+        Assert.Equal(1, c.Index);
+
+        c.Clamp(0);
+        Assert.Equal(-1, c.Index);
+        c.Move(+1, 0);
+        Assert.Equal(-1, c.Index);
+
+        c.Clamp(4);
+        Assert.Equal(0, c.Index);
+    }
+}