TST: Get rid of a ResourceWarning.

I'm not sure this is the right fix, but test_closing_fid need to check
that garbage collection will close a file that goes through a bunch of
openings followed by dropping the reference. So the fix is to ignore
warnings during the test. I'd just ignore ResourceWarning, but it does
not look to be a built in warning in Python 2.7.

1 files changed, 15 insertions, 6 deletions

diff --git a/numpy/lib/tests/test_io.py b/numpy/lib/tests/test_io.py
index f1088ebb5..9144138d1 100644
--- a/numpy/lib/tests/test_io.py
+++ b/numpy/lib/tests/test_io.py
@@ -205,12 +205,21 @@ class TestSavezLoad(RoundtripTest, TestCase):
             fp = open(tmp, 'wb')
             np.savez(fp, data='LOVELY LOAD')
             fp.close()
-
-            for i in range(1, 1025):
-                try:
-                    np.load(tmp)["data"]
-                except Exception as e:
-                    raise AssertionError("Failed to load data from a file: %s" % e)
+            # We need to check if the garbage collector can properly close
+            # numpy npz file returned by np.load when their reference count
+            # goes to zero.  Python 3 running in debug mode raises a
+            # ResourceWarning when file closing is left to the garbage
+            # collector, so we catch the warnings.  Because ResourceWarning
+            # is unknown in Python < 3.x, we take the easy way out and
+            # catch all warnings.
+            with warnings.catch_warnings():
+                warnings.simplefilter("ignore")
+                for i in range(1, 1025):
+                    try:
+                        np.load(tmp)["data"]
+                    except Exception as e:
+                        msg = "Failed to load data from a file: %s" % e
+                        raise AssertionError(msg)
         finally:
             os.remove(tmp)