Print full traceback for debugging Windows

Author: stefanv

spin/tests/testutil.py

@@ -1,5 +1,6 @@
 import subprocess
 import sys
+import traceback
 
 import pytest
 
@@ -29,7 +30,11 @@ def spin(*args, **user_kwargs):
         "stderr": subprocess.PIPE,
         "sys_exit": True,
     }
-    return run(["spin"] + list(args), **{**default_kwargs, **user_kwargs})
+    try:
+        return run(["spin"] + list(args), **{**default_kwargs, **user_kwargs})
+    except Exception:
+        traceback.print_exc()
+        raise
 
 
 def stdout(p):