From 4058786dcd0de161fe991fc391032646b692f8b2 Mon Sep 17 00:00:00 2001
From: Konrad Hinsen <konrad.hinsen@fastmail.net>
Date: Tue, 11 Feb 2014 12:59:11 +0100
Subject: [PATCH] Print a warning when iptest is run from the IPython source
 directory

---
 IPython/testing/iptestcontroller.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/IPython/testing/iptestcontroller.py b/IPython/testing/iptestcontroller.py
index 8300e32c3..bcdbb5e66 100644
--- a/IPython/testing/iptestcontroller.py
+++ b/IPython/testing/iptestcontroller.py
@@ -499,6 +499,14 @@ def default_options():
     return options
 
 def main():
+    # iptest doesn't work correctly if the working directory is the
+    # root of the IPython source tree. Tell the user to avoid
+    # frustration.
+    if os.path.exists(os.path.join(os.getcwd(),
+                                   'IPython', 'testing', '__main__.py')):
+        print("Don't run iptest from the IPython source directory",
+              file=sys.stderr)
+        sys.exit(1)
     # Arguments after -- should be passed through to nose. Argparse treats
     # everything after -- as regular positional arguments, so we separate them
     # first.