Add unit test for PropertyGridCommands.cs file

src/test/unit/System.Windows.Forms/System/Windows/Forms/PropertyGridCommandsTests.cs

@@ -0,0 +1,52 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.ComponentModel.Design;
+using System.Windows.Forms.PropertyGridInternal;
+
+namespace System.Windows.Forms.Tests;
+
+public class PropertyGridCommandsTests
+{
+    [WinFormsTheory]
+    [InlineData(0x3000)]
+    [InlineData(0x3001)]
+    [InlineData(0x3002)]
+    [InlineData(0x3010)]
+    public void PropertyGridCommand_CommandID_HasExpectedValues(int expectedId)
+    {
+        Guid expectedGuid = new Guid("5a51cf82-7619-4a5d-b054-47f438425aa7");
+        CommandID command = expectedId switch
+        {
+            0x3000 => PropertyGridCommands.Reset,
+            0x3001 => PropertyGridCommands.Description,
+            0x3002 => PropertyGridCommands.Hide,
+            0x3010 => PropertyGridCommands.Commands,
+            _ => throw new ArgumentOutOfRangeException(nameof(expectedId))
+        };
+
+        command.Should().NotBeNull();
+        command.Guid.Should().Be(expectedGuid);
+        command.ID.Should().Be(expectedId);
+    }
+
+    private class PropertyGridCommandsAccessor : PropertyGridCommands
+    {
+        public static Guid WfcMenuGroup => wfcMenuGroup;
+        public static Guid WfcMenuCommand => wfcMenuCommand;
+    }
+
+    [WinFormsFact]
+    public void WfcMenuGroup_HasExpectedGuid()
+    {
+        PropertyGridCommandsAccessor.WfcMenuGroup
+            .Should().Be(new Guid("a72bd644-1979-4cbc-a620-ea4112198a66"));
+    }
+
+    [WinFormsFact]
+    public void WfcMenuCommand_HasExpectedGuid()
+    {
+        PropertyGridCommandsAccessor.WfcMenuCommand
+            .Should().Be(new Guid("5a51cf82-7619-4a5d-b054-47f438425aa7"));
+    }
+}