Adds code coverage to FormatStringEditorTests

src/System.Windows.Forms.Design/tests/UnitTests/System/Windows/Forms/Design/FormatStringEditorTests.cs

@@ -0,0 +1,19 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+#nullable enable
+
+using System.Windows.Forms.TestUtilities;
+
+namespace System.Windows.Forms.Design.Tests.System.Windows.Forms.Design;
+
+public class FormatStringEditorTests
+{
+ [Theory]
+ [CommonMemberData(typeof(CommonTestHelperEx), nameof(CommonTestHelperEx.GetEditValueInvalidProviderTestData))]
+ public void EditValue_InvalidProvider_ReturnsValue(IServiceProvider provider, object value)
+ {
+ FormatStringEditor editor = new ();
+ editor.EditValue(null, provider, value).Should().Be(value);
+ }
+}