From 9726fafa98885fd3bec3972da3bda5f5ce91afdf Mon Sep 17 00:00:00 2001
From: Almar Klein <almar.klein@gmail.com>
Date: Sat, 21 Mar 2015 09:26:35 +0100
Subject: [PATCH] allow postmortem debugging on failed test

---
 _pytest/runner.py | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/_pytest/runner.py b/_pytest/runner.py
index 2932f14c3..8accd3b0c 100644
--- a/_pytest/runner.py
+++ b/_pytest/runner.py
@@ -86,7 +86,17 @@ def pytest_runtest_setup(item):
     item.session._setupstate.prepare(item)
 
 def pytest_runtest_call(item):
-    item.runtest()
+    try:
+        item.runtest()
+    except Exception:
+        # Store trace info to allow postmortem debugging
+        type, value, tb = sys.exc_info()
+        tb = tb.tb_next  # Skip *this* frame
+        sys.last_type = type
+        sys.last_value = value
+        sys.last_traceback = tb
+        del tb  # Get rid of it in this namespace
+        raise
 
 def pytest_runtest_teardown(item, nextitem):
     item.session._setupstate.teardown_exact(item, nextitem)