internals: remove invalid test

'<M8[ns]' - '<M8[ns]' = '<m8[ns]' , other binop are invalid.

Author: holymonson

pandas/core/internals/__init__.py

@@ -2788,10 +2788,10 @@ def set(self, locs, values, check=False):
         self.values[locs] = values
 
     def eval(self, func, other, try_cast=False, **kwargs):
-        block = super().eval(func, other, try_cast=try_cast, **kwargs)[0]
+        block = super(DatetimeBlock, self).eval(func, other, try_cast=try_cast,
+                                                **kwargs)[0]
         if try_cast:
-            if isinstance(other,
-                          (tslibs.Timestamp, np.datetime64, datetime, date)):
+            if isinstance(other, (np.datetime64, date)):
                 block = TimeDeltaBlock(block.values, block.mgr_locs,
                                        ndim=block.ndim)
             elif isinstance(other, ABCDateOffset):

pandas/tests/internals/test_internals.py

@@ -1238,7 +1238,6 @@ class TestCanHoldElement(object):
         (2**63, 'complex128'),
         (True, 'bool'),
         (np.timedelta64(20, 'ns'), '<m8[ns]'),
-        (np.datetime64(20, 'ns'), '<M8[ns]'),
     ])
     @pytest.mark.parametrize('op', [
         operator.add,
@@ -1249,15 +1248,16 @@ class TestCanHoldElement(object):
         operator.pow,
     ], ids=lambda x: x.__name__)
     def test_binop_other(self, op, value, dtype):
-        skip = {(operator.add, 'bool'),
-                (operator.sub, 'bool'),
-                (operator.mul, 'bool'),
-                (operator.truediv, 'bool'),
-                (operator.mod, 'i8'),
-                (operator.mod, 'complex128'),
-                (operator.mod, '<M8[ns]'),
-                (operator.mod, '<m8[ns]'),
-                (operator.pow, 'bool')}
+        skip = {
+            (operator.add, 'bool'),
+            (operator.sub, 'bool'),
+            (operator.mul, 'bool'),
+            (operator.truediv, 'bool'),
+            (operator.mod, 'i8'),
+            (operator.mod, 'complex128'),
+            (operator.mod, '<m8[ns]'),
+            (operator.pow, 'bool'),
+        }
         if (op, dtype) in skip:
             pytest.skip("Invalid combination {},{}".format(op, dtype))
         e = DummyElement(value, dtype)