Fix path validation and add iteration cleanup to prevent file reuse

Co-authored-by: adamhathcock <527620+adamhathcock@users.noreply.github.com>

tests/SharpCompress.Performance/BenchmarkBase.cs

@@ -16,6 +16,14 @@ public class BenchmarkBase
             "SharpCompress.Performance",
             StringComparison.OrdinalIgnoreCase
         );
+
+        if (index == -1)
+        {
+            throw new InvalidOperationException(
+                "Could not locate SharpCompress.Performance in the base directory path"
+            );
+        }
+
         var path = AppDomain.CurrentDomain.BaseDirectory.Substring(0, index);
         var solutionBasePath =
             Path.GetDirectoryName(path)

tests/SharpCompress.Performance/WriteBenchmarks.cs

@@ -34,6 +34,19 @@ public class WriteBenchmarks : BenchmarkBase
         }
     }
 
+    [IterationCleanup]
+    public void IterationCleanup()
+    {
+        // Clean up created archives after each iteration to avoid file reuse affecting measurements
+        if (Directory.Exists(_tempOutputPath))
+        {
+            foreach (var file in Directory.GetFiles(_tempOutputPath))
+            {
+                File.Delete(file);
+            }
+        }
+    }
+
     [GlobalCleanup]
     public void Cleanup()
     {