MaxLevelOfParallelismAttribute.cs

namespace NetEvolve.Extensions.NUnit;

using System;
using System.Diagnostics.CodeAnalysis;
using global::NUnit.Framework;

/// <summary>
/// Sets the number of worker threads taking into account the available
/// <see cref="Environment.ProcessorCount"/> that can be allocated by the framework
/// for the execution of tests.
/// </summary>
[AttributeUsage(AttributeTargets.Assembly, AllowMultiple = false, Inherited = false)]
[SuppressMessage("Design", "CA1019:Define accessors for attribute arguments", Justification = "As designed.")]
public sealed class MaxLevelOfParallelismAttribute : PropertyAttribute
{
    /// <summary>
    /// Construct a <see cref="MaxLevelOfParallelismAttribute"/>.
    /// </summary>
    /// <param name="level">The number of worker threads to be created by the framework.</param>
    public MaxLevelOfParallelismAttribute(int level)
        : base("LevelOfParallelism", Math.Min(level, (int)(Environment.ProcessorCount * .75))) { }
}