supress expected cast warnings

Author: mathause

xarray/tests/test_array_api.py

@@ -51,6 +51,8 @@ def test_aggregation_skipna(arrays) -> None:
     assert_equal(actual, expected)
 
 
+# casting nan warns
+@pytest.mark.filterwarnings("ignore:invalid value encountered in cast")
 def test_astype(arrays) -> None:
     np_arr, xp_arr = arrays
     expected = np_arr.astype(np.int64)

xarray/tests/test_dataset.py

@@ -6007,6 +6007,8 @@ def test_dataset_number_math(self) -> None:
         actual += 0
         assert_identical(ds, actual)
 
+    # casting nan warns
+    @pytest.mark.filterwarnings("ignore:invalid value encountered in cast")
     def test_unary_ops(self) -> None:
         ds = self.make_example_math_dataset()