Better assert message for AllSetupAndCleanupMethodRunsTest

tests/BenchmarkDotNet.IntegrationTests/AllSetupAndCleanupTest.cs

@@ -60,7 +60,7 @@ public void AllSetupAndCleanupMethodRunsTest()
             var actualLogLines = GetActualLogLines(summary);
             foreach (string line in actualLogLines)
                 Output.WriteLine(line);
-            Assert.Equal(expectedLogLines, actualLogLines);
+            SmartAssert.Equal(expectedLogLines, actualLogLines);
         }
 
         public class AllSetupAndCleanupAttributeBenchmarks

tests/BenchmarkDotNet.Tests/XUnit/SmartAssert.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace BenchmarkDotNet.Tests.XUnit
+{
+    public static class SmartAssert
+    {
+        public static void Equal<T>(IReadOnlyList<T> expected, IReadOnlyList<T> actual)
+        {
+            Exception CreateException(string comment)
+            {
+                var builder = new StringBuilder();
+                builder.AppendLine($"Failure ({comment})");
+                builder.AppendLine("*** Expected ***");
+                for (int i = 0; i < expected.Count; i++)
+                    builder.AppendLine($"[{i}]: {expected[i]}");
+                builder.AppendLine("*** Actual ***");
+                for (int i = 0; i < actual.Count; i++)
+                    builder.AppendLine($"[{i}]: {actual[i]}");
+                return new Exception(builder.ToString());
+            }
+
+            if (expected.Count != actual.Count)
+                throw CreateException("Length mismatch");
+            for (int i = 0; i < expected.Count; i++)
+                if (!expected[i].Equals(actual[i]))
+                    throw CreateException($"Element mismatch (index={i})");
+        }
+    }
+}