Add test for IPython.utils.localinterfaces

IPython/utils/tests/test_localinterfaces.py

@@ -0,0 +1,15 b''
+#-----------------------------------------------------------------------------
+#  Copyright (C) 2013  The IPython Development Team
+#
+#  Distributed under the terms of the BSD License.  The full license is in
+#  the file COPYING, distributed as part of this software.
+#-----------------------------------------------------------------------------
+
+from .. import localinterfaces
+
+def test_load_ips():
+    # Override the machinery that skips it if it was called before
+    localinterfaces._load_ips.called = False
+
+    # Just check this doesn't error
+    localinterfaces._load_ips(suppress_exceptions=False)
  No newline at end of file

IPython/utils/localinterfaces.py

@@ -42,10 +42,10 b" LOCALHOST = ''"
 def _only_once(f):
     """decorator to only run a function once"""
     f.called = False
-    def wrapped():
+    def wrapped(**kwargs):
         if f.called:
             return
-        ret = f()
+        ret = f(**kwargs)
         f.called = True
         return ret
     return wrapped
@@ -203,7 +203,7 b' def _load_ips_dumb():'
     PUBLIC_IPS[:] = []
 
 @_only_once
-def _load_ips():
+def _load_ips(suppress_exceptions=True):
     """load the IPs that point to this machine
     
     This function will only ever be called once.
@@ -241,6 +241,8 b' def _load_ips():'
         
         return _load_ips_gethostbyname()
     except Exception as e:
+        if not suppress_exceptions:
+            raise
         # unexpected error shouldn't crash, load dumb default values instead.
         warn("Unexpected error discovering local network interfaces: %s" % e)
     _load_ips_dumb()