Add unit tests for ButtonBaseDesigner (#11690)

* Add unit tests for ButtonBaseDesigner

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

@@ -0,0 +1,56 @@
+// 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.Collections;
+
+namespace System.Windows.Forms.Design.Tests;
+
+public sealed class ButtonBaseDesignerTests
+{
+ [Fact]
+ public void ButtonBaseDesigner_Constructor_Initialize_AutoResizeHandles()
+ {
+ using ButtonBaseDesigner buttonBaseDesigner = new();
+
+ buttonBaseDesigner.AutoResizeHandles.Should().Be(true);
+ }
+
+ public static TheoryData<IDictionary<string, object>?> IDictionary_TheoryData => new()
+ {
+ null,
+ new Dictionary<string, object>()
+ };
+
+ [Theory]
+ [MemberData(nameof(IDictionary_TheoryData))]
+ public void ButtonBaseDesigner_InitializeNewComponent_WithDefaultButton(IDictionary<string, object>? defaultValues)
+ {
+ using ButtonBaseDesigner buttonBaseDesigner = new();
+ using Button button = new();
+ buttonBaseDesigner.Initialize(button);
+
+ buttonBaseDesigner.InitializeNewComponent((IDictionary?)defaultValues);
+ Assert.False(button.IsHandleCreated);
+ }
+
+ [Theory]
+ [MemberData(nameof(IDictionary_TheoryData))]
+ public void ButtonBaseDesigner_InitializeNewComponent_NotInitialized(IDictionary<string, object>? defaultValues)
+ {
+ using ButtonBaseDesigner buttonBaseDesigner = new();
+ Action action = () => buttonBaseDesigner.InitializeNewComponent((IDictionary?)defaultValues);
+ action.Should().Throw<InvalidOperationException>();
+ }
+
+ [Fact]
+ public void ButtonBaseDesigner_SnapLinesWithDefaultButton_ShouldReturnExpectedCount()
+ {
+ using ButtonBaseDesigner buttonBaseDesigner = new();
+ using Button button = new();
+ buttonBaseDesigner.Initialize(button);
+
+ buttonBaseDesigner.SnapLines.Count.Should().Be(9);
+ }
+}