Add a note to MemoryLeakTest about its difficulties.

2 files changed, 8 insertions, 2 deletions

diff --git a/setup.py b/setup.py
index 39756796..1d4e9efd 100644
--- a/setup.py
+++ b/setup.py
@@ -132,7 +132,7 @@ try:
     setup(**setup_args)
 except:     # pylint: disable=W0702
     # When setup() can't compile, it tries to exit.  We'll catch SystemExit
-    # here :-(, and try again. 
+    # here :-(, and try again.
     if 'install' not in sys.argv or 'ext_modules' not in setup_args:
         # We weren't trying to install an extension, so forget it.
         raise
diff --git a/test/test_oddball.py b/test/test_oddball.py
index 859648fa..724ae863 100644
--- a/test/test_oddball.py
+++ b/test/test_oddball.py
@@ -129,7 +129,13 @@ class RecursionTest(CoverageTest):
 
 
 class MemoryLeakTest(CoverageTest):
-    """Attempt the impossible: test that memory doesn't leak."""
+    """Attempt the impossible: test that memory doesn't leak.
+
+    Note: this test is truly unusual, and may fail unexpectedly.  
+    In particular, it is known to fail on PyPy if test_oddball.py is run in
+    isolation: https://bitbucket.org/ned/coveragepy/issue/186
+
+    """
 
     def test_for_leaks(self):
         lines = list(range(301, 315))