TST: Add tests for maximum_sctype

1 files changed, 27 insertions, 0 deletions

diff --git a/numpy/core/tests/test_numerictypes.py b/numpy/core/tests/test_numerictypes.py
index 4c3cc6c9e..22abe00fd 100644
--- a/numpy/core/tests/test_numerictypes.py
+++ b/numpy/core/tests/test_numerictypes.py
@@ -3,6 +3,7 @@ from __future__ import division, absolute_import, print_function
 import sys
 import itertools
 
+import pytest
 import numpy as np
 from numpy.testing import assert_, assert_equal, assert_raises
 
@@ -412,3 +413,29 @@ def TestSctypeDict(object):
     def test_longdouble(self):
         assert_(np.sctypeDict['f8'] is not np.longdouble)
         assert_(np.sctypeDict['c16'] is not np.clongdouble)
+
+
+class TestMaximumSctype(object):
+
+    # note that parametrizing with sctype['int'] and similar would skip types
+    # with the same size (gh-11923)
+
+    @pytest.mark.parametrize('t', [np.byte, np.short, np.intc, np.int_, np.longlong])
+    def test_int(self, t):
+        assert_equal(np.maximum_sctype(t), np.sctypes['int'][-1])
+
+    @pytest.mark.parametrize('t', [np.ubyte, np.ushort, np.uintc, np.uint, np.ulonglong])
+    def test_uint(self, t):
+        assert_equal(np.maximum_sctype(t), np.sctypes['uint'][-1])
+
+    @pytest.mark.parametrize('t', [np.half, np.single, np.double, np.longdouble])
+    def test_float(self, t):
+        assert_equal(np.maximum_sctype(t), np.sctypes['float'][-1])
+
+    @pytest.mark.parametrize('t', [np.csingle, np.cdouble, np.clongdouble])
+    def test_complex(self, t):
+        assert_equal(np.maximum_sctype(t), np.sctypes['complex'][-1])
+
+    @pytest.mark.parametrize('t', [np.bool_, np.object_, np.unicode_, np.bytes_, np.void])
+    def test_other(self, t):
+        assert_equal(np.maximum_sctype(t), t)