Remove NaT assume

Author: dcherian

properties/test_index_manipulation.py

@@ -9,7 +9,7 @@
 pytest.importorskip("hypothesis")
 
 import hypothesis.strategies as st
-from hypothesis import assume, note, settings
+from hypothesis import note, settings
 from hypothesis.stateful import (
     RuleBasedStateMachine,
     invariant,
@@ -59,9 +59,6 @@ def __init__(self):
         )
     )
     def add_dim_coord(self, var):
-        # https://github.com/HypothesisWorks/hypothesis/issues/3943
-        assume(np.all(~np.isnat(var.data)) if var.dtype.kind in ["mM"] else True)
-
         (name,) = var.dims
         note(f"adding dimension coordinate {name}")
         # dim coord
@@ -73,9 +70,6 @@ def add_dim_coord(self, var):
 
     @rule(var=xrst.index_variables(dims=DIM_NAME))
     def assign_coords(self, var):
-        # https://github.com/HypothesisWorks/hypothesis/issues/3943
-        assume(np.all(~np.isnat(var.data)) if var.dtype.kind in ["mM"] else True)
-
         (name,) = var.dims
         note(f"assign_coords: {name}")
         self.dataset = self.dataset.assign_coords({name: var})