using Xunit;
namespace Sbroenne.ExcelMcp.ComInterop.Tests.Unit;
/// <summary>
/// Extended tests for ComUtilities - tests error handling and edge cases.
/// </summary>
[Trait("Category", "Unit")]
[Trait("Speed", "Fast")]
[Trait("Layer", "ComInterop")]
public class ComUtilitiesExtendedTests
{
[Fact]
public void Release_WithComObject_DoesNotThrow()
{
// This test verifies Release handles actual COM objects gracefully
// Note: We can't easily create real COM objects in unit tests,
// but we verify the method is null-safe
object? obj = null;
ComUtilities.Release(ref obj);
Assert.Null(obj);
}
[Theory]
[InlineData(null)]
[InlineData("")]
[InlineData("test")]
public void Release_WithVariousTypes_SetsToNull(string? testValue)
{
// Arrange
string? obj = testValue;
// Act
ComUtilities.Release(ref obj);
// Assert
Assert.Null(obj);
}
[Fact]
public async Task Release_CalledConcurrently_ThreadSafe()
{
// Arrange
var tasks = new List<Task>();
// Act - Release from multiple threads
for (int i = 0; i < 10; i++)
{
tasks.Add(Task.Run(() =>
{
object? obj = new object();
ComUtilities.Release(ref obj);
Assert.Null(obj);
}));
}
// Assert - All complete without exceptions
await Task.WhenAll(tasks);
}
}
