Record a global call order between all invocations to be used in sequence verification

Author: PatrickScottDS

src/Moq/IInvocation.cs

@@ -41,5 +41,10 @@ public interface IInvocation
         /// Optional exception if the method invocation results in an exception being thrown.
         /// </summary>
         Exception Exception { get; }
+
+        /// <summary>
+        /// A number representing the order of this invocation in time with respect to all other invocations
+        /// </summary>
+        long SequenceNumber { get; }
     }
 }

src/Moq/Invocation.cs

@@ -6,7 +6,7 @@
 using System.Diagnostics;
 using System.Reflection;
 using System.Text;
-
+using System.Threading;
 using Moq.Async;
 
 namespace Moq
@@ -20,6 +20,8 @@ abstract class Invocation : IInvocation
         object result;
         Setup matchingSetup;
         bool verified;
+        long sequenceNumber;
+        static long globalSequenceNumber = 0;//ONLY access with Interlocked.Increment()
 
         /// <summary>
         /// Initializes a new instance of the <see cref="Invocation"/> class.
@@ -36,8 +38,11 @@ protected Invocation(Type proxyType, MethodInfo method, params object[] argument
             this.arguments = arguments;
             this.method = method;
             this.proxyType = proxyType;
+            this.sequenceNumber = Interlocked.Increment(ref globalSequenceNumber);
         }
 
+        public long SequenceNumber => this.sequenceNumber;
+
         /// <summary>
         /// Gets the method of the invocation.
         /// </summary>