BUG: Fix numpy.testing.assert_equal in release mode.

To be complete, the NaT handling needs to raise AssertionError when
comparing NaT's with different types. That check was previously passed
on and the resulting check, which would succeed in development mode
because DeprecationWarning was converted to an error, warns in release
mode.

1 files changed, 6 insertions, 3 deletions

diff --git a/numpy/testing/nose_tools/utils.py b/numpy/testing/nose_tools/utils.py
index 973e3bb4b..6c77e5e21 100644
--- a/numpy/testing/nose_tools/utils.py
+++ b/numpy/testing/nose_tools/utils.py
@@ -394,14 +394,17 @@ def assert_equal(actual, desired, err_msg='', verbose=True):
         isdesnat = isnat(desired)
         isactnat = isnat(actual)
         dtypes_match = array(desired).dtype.type == array(actual).dtype.type
-        if isdesnat and isactnat and dtypes_match:
+        if isdesnat and isactnat:
             # If both are NaT (and have the same dtype -- datetime or
             # timedelta) they are considered equal.
-            return
+            if dtypes_match:
+                return
+            else:
+                raise AssertionError(msg)
+
     except (TypeError, ValueError, NotImplementedError):
         pass
 
-
     try:
         # Explicitly use __eq__ for comparison, gh-2552
         if not (desired == actual):