// 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.ComponentModel;
using Moq;
 
namespace System.Windows.Forms.Tests;
 
public class FlatButtonAppearanceConverterTests
{
    private readonly FlatButtonAppearanceConverter _converter = new();
 
    [Fact]
    public void ConvertTo_NullContextOrCulture_ReturnsEmptyString()
    {
        string resultWithNullContext = (string)_converter.ConvertTo(context: null, culture: null, value: null, destinationType: typeof(string));
        string resultWithNullCulture = (string)_converter.ConvertTo(context: null, culture: null, value: null, destinationType: typeof(string));
 
        resultWithNullContext.Should().Be("");
        resultWithNullCulture.Should().Be("");
    }
 
    [Fact]
    public void ConvertTo_InvalidDestinationType_ThrowsException()
    {
        Action action1 = () => _converter.ConvertTo(context: null, culture: null, value: null, destinationType: null!);
        Action action2 = () => _converter.ConvertTo(context: null, culture: null, value: null, destinationType: typeof(int));
 
        action1.Should().Throw<ArgumentNullException>();
        action2.Should().Throw<NotSupportedException>();
    }
 
    [Fact]
    public void GetsProperties_WithNullValues()
    {
        using Button button = new();
 
        Action action = () => _converter.GetProperties(context: null, value: button, attributes: null);
 
        action.Should().NotThrow();
    }
 
    [Fact]
    public void GetProperties_ContextNull_ReturnsProperties()
    {
        using Button button = new();
        Attribute[] attributes = [new BrowsableAttribute(true)];
 
        PropertyDescriptorCollection properties = _converter.GetProperties(context: null, button, attributes);
 
        properties.Should().NotBeNull();
    }
 
    [Fact]
    public void GetProperties_AttributesNull_ReturnsProperties()
    {
        using Button button = new();
        Mock<ITypeDescriptorContext> contextMock = new();
        contextMock.Setup(c => c.Instance).Returns(button);
 
        PropertyDescriptorCollection properties = _converter.GetProperties(contextMock.Object, button, attributes: null);
 
        properties.Should().NotBeNull();
    }
}