Only have extra assertions on the Event Buffer.

src/Qowaiv.DomainModel.TestTools/AssertionFailed.cs

@@ -8,6 +8,7 @@
 public class AssertionFailed : Exception
 {
     /// <summary>Initializes a new instance of the <see cref="AssertionFailed"/> class.</summary>
+    [ExcludeFromCodeCoverage/* Justification = "Required for inheritance only." */]
     public AssertionFailed() : this("Assertion failed.") { }
 
     /// <summary>Initializes a new instance of the <see cref="AssertionFailed"/> class.</summary>
@@ -24,6 +25,7 @@ public class AssertionFailed : Exception
     /// The exception that is the cause of the current exception, or a null reference
     ///  if no inner exception is specified.
     /// </param>
+    [ExcludeFromCodeCoverage/* Justification = "Required for inheritance only." */]
     public AssertionFailed(string message, Exception innerException) : base(message, innerException) { }
 
     /// <summary>Initializes a new instance of the <see cref="AssertionFailed"/> class.</summary>
@@ -33,5 +35,6 @@ public class AssertionFailed : Exception
     /// <param name="context">
     /// An object that describes the source or destination of the serialized data.
     /// </param>
+    [ExcludeFromCodeCoverage/* Justification = "Required for inheritance only." */]
     protected AssertionFailed(SerializationInfo info, StreamingContext context) : base(info, context) { }
 }

src/Qowaiv.DomainModel.TestTools/Extensions/QowaivDomainModelFluentAssertions.cs

@@ -0,0 +1,21 @@
+using Qowaiv.DomainModel;
+using Qowaiv.DomainModel.TestTools.FluentAssertions;
+using System.Diagnostics.Contracts;
+
+namespace FluentAssertions;
+
+/// <summary>Contains extension methods for custom assertions in unit tests.</summary>
+[DebuggerNonUserCode]
+public static class QowaivDomainModelFluentAssertions
+{
+    /// <summary>
+    /// Returns an <see cref="EventBufferAssertions{TId}"/> object that can be used to assert the
+    /// current event buffer.
+    /// </summary>
+    /// <typeparam name="TId">
+    /// The type of the identifier of the event buffer.
+    /// </typeparam>
+    [Pure]
+    [CLSCompliant(false)]
+    public static EventBufferAssertions<TId> Should<TId>(this EventBuffer<TId> buffer) => new(buffer);
+}