Fix tests failing when the environment causes getlogin to fail.

CHANGES.md

@@ -28,6 +28,7 @@
     subset of strings were allowed. These now result in a proper MakeFileError.
   - Fixed user options in the 'BWA' section of the BAM Pipeline makefiles not
     being correctly applied when using the 'mem' or the 'bwasw' algorithms.
+  - Fixed some unit tests failing when the environment caused getlogin to fail.
 
 
 ## [1.2.7] - 2017-01-03

paleomix/common/testing.py

@@ -21,6 +21,7 @@
 # SOFTWARE.
 #
 import os
+import pwd
 import sys
 import shutil
 import tempfile
@@ -46,8 +47,9 @@ def with_temp_folder(func):
     Creates a unique temporary folder before running 'func'. The
     function is is assumed to take at least one parameter, the first
     of which is assumed to represent the temporary folder."""
-    temp_root = os.path.join(tempfile.gettempdir(), os.getlogin())
-    make_dirs(temp_root) # Ensure that this subdirectory exists
+    name = pwd.getpwuid(os.geteuid()).pw_name
+    temp_root = os.path.join(tempfile.gettempdir(), name)
+    make_dirs(temp_root)
 
     @nose.tools.istest
     def _wrapper(*args, **kwargs):