Introduction of emptyclassAttribute.

src/Qowaiv.TestTools/Diagnostics/EmptyClassAttribute.cs

@@ -0,0 +1,10 @@
+namespace Qowaiv.TestTools.Diagnostics;
+
+/// <summary>Decorate empty test classes.</summary>
+/// <remarks>
+/// Normally, S2094 is indeed a bad practice, but for some test purposes, it
+/// can be extremely useful. We do not want to suppress S2094, and by decorating
+/// empty classes, S2094 is not raised.
+/// </remarks>
+[AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
+public sealed class EmptyClassAttribute : Attribute { }