tests: distmatrix returns numpy datatypes

Orange/tests/test_distances.py

@@ -186,6 +186,17 @@ def test_save(self):
                              ["danny", "eve", "frank"])
             self.assertEqual(m.axis, 0)
 
+    def test_numpy_type(self):
+        """
+        Test if for DistMatrix function returning a single element if they
+        are numpy datatype. This is needed for other numpy function to work.
+        """
+        data = np.random.randint(3, 5, (3, 5))
+        dm1, dm2 = DistMatrix(data), DistMatrix(data)
+
+        self.assertEqual(np.int64, type(dm1.max()))
+        np.testing.assert_array_equal(dm1, dm2)
+
 
 # noinspection PyTypeChecker
 class TestEuclidean(TestCase):