1 files changed, 32 insertions, 0 deletions
diff --git a/csharp/ProtocolBuffers.Test/TestUtil.cs b/csharp/ProtocolBuffers.Test/TestUtil.cs
new file mode 100644
index 00000000..40ad878d
--- /dev/null
+++ b/csharp/ProtocolBuffers.Test/TestUtil.cs
@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.IO;
+
+namespace Google.ProtocolBuffers {
+  internal static class TestUtil {
+
+    private static DirectoryInfo testDataDirectory;
+
+    internal static DirectoryInfo TestDataDirectory {
+      get {
+        if (testDataDirectory != null) {
+          return testDataDirectory;
+        }
+
+        DirectoryInfo ancestor = new DirectoryInfo(".");
+        // Search each parent directory looking for "src/google/protobuf".
+        while (ancestor != null) {
+          string candidate = Path.Combine(ancestor.FullName, "src/google/protobuf");
+          if (Directory.Exists(candidate)) {
+            testDataDirectory = new DirectoryInfo(candidate);
+            return testDataDirectory;
+          }
+          ancestor = ancestor.Parent;
+        }
+        // TODO(jonskeet): Come up with a better exception to throw
+        throw new Exception("Unable to find directory containing test files");
+      }
+    }
+  }
+}