TST/BUG: test unsortable in safe_sort and Categorical (GH13714)

- Change test for Categorical.from_array
- Add test for safe_sort
- Change 2.7 build to latest numpy

Author: pijucha

ci/requirements-2.7.build

@@ -1,4 +1,4 @@
 python-dateutil=2.4.1
 pytz=2013b
-numpy=1.9.3
+numpy
 cython=0.19.1

ci/requirements-2.7.run

@@ -1,6 +1,6 @@
 python-dateutil=2.4.1
 pytz=2013b
-numpy=1.9.3
+numpy
 xlwt=0.7.5
 numexpr
 pytables

pandas/tests/test_algos.py

@@ -5,7 +5,6 @@
 from numpy.random import RandomState
 from numpy import nan
 import datetime
-
 from pandas import Series, Categorical, CategoricalIndex, Index
 import pandas as pd
 
@@ -116,6 +115,19 @@ def test_mixed_integer(self):
         labels = [0, 1, 2, 3, 0, -1, 1]
         result, result_labels = algos.safe_sort(values, labels)
         expected = np.array([0, 1, 'a', 'b'], dtype=object)
+        expected_labels = np.array([3, 1, 0, 2, 3, -1, 1])
+        tm.assert_numpy_array_equal(result, expected)
+        tm.assert_numpy_array_equal(result_labels, expected_labels)
+
+    def test_unsortable(self):
+        # GH 13714
+        arr = np.array([1, 2, datetime.datetime.now(), 0, 3], dtype=object)
+        if compat.PY2 and not pd._np_version_under1p10:
+            # RuntimeWarning: tp_compare didn't return -1 or -2 for exception
+            with tm.assert_produces_warning(RuntimeWarning):
+                tm.assertRaises(TypeError, algos.safe_sort, arr)
+        else:
+            tm.assertRaises(TypeError, algos.safe_sort, arr)
 
     def test_exceptions(self):
         with tm.assertRaisesRegexp(TypeError,

pandas/tests/test_categorical.py

@@ -97,18 +97,9 @@ def test_constructor_unsortable(self):
         factor = Categorical.from_array(arr, ordered=False)
         self.assertFalse(factor.ordered)
 
-        if compat.PY3:
-            self.assertRaises(
-                TypeError, lambda: Categorical.from_array(arr, ordered=True))
-        else:
-            # this however will raise as cannot be sorted (on PY3 or older
-            # numpies)
-            if LooseVersion(np.__version__) < "1.10":
-                self.assertRaises(
-                    TypeError,
-                    lambda: Categorical.from_array(arr, ordered=True))
-            else:
-                Categorical.from_array(arr, ordered=True)
+        # this however will raise as cannot be sorted
+        self.assertRaises(
+            TypeError, lambda: Categorical.from_array(arr, ordered=True))
 
     def test_is_equal_dtype(self):