Fix some dask tests (pydata#9321)

* Fix some dask tests

* Cleanup

xarray/tests/test_dask.py

@@ -640,8 +640,10 @@ def counting_get(*args, **kwargs):
 
     def test_duplicate_dims(self):
         data = np.random.normal(size=(4, 4))
-        arr = DataArray(data, dims=("x", "x"))
-        chunked_array = arr.chunk({"x": 2})
+        with pytest.warns(UserWarning, match="Duplicate dimension"):
+            arr = DataArray(data, dims=("x", "x"))
+        with pytest.warns(UserWarning, match="Duplicate dimension"):
+            chunked_array = arr.chunk({"x": 2})
         assert chunked_array.chunks == ((2, 2), (2, 2))
         assert chunked_array.chunksizes == {"x": (2, 2)}
 
@@ -1364,7 +1366,8 @@ def test_map_blocks_ds_transformations(func, map_ds):
 @pytest.mark.parametrize("obj", [make_da(), make_ds()])
 def test_map_blocks_da_ds_with_template(obj):
     func = lambda x: x.isel(x=[1])
-    template = obj.isel(x=[1, 5, 9])
+    # a simple .isel(x=[1, 5, 9]) puts all those in a single chunk.
+    template = xr.concat([obj.isel(x=[i]) for i in [1, 5, 9]], dim="x")
     with raise_if_dask_computes():
         actual = xr.map_blocks(func, obj, template=template)
     assert_identical(actual, template)
@@ -1395,15 +1398,16 @@ def test_map_blocks_roundtrip_string_index():
 
 def test_map_blocks_template_convert_object():
     da = make_da()
+    ds = da.to_dataset()
+
     func = lambda x: x.to_dataset().isel(x=[1])
-    template = da.to_dataset().isel(x=[1, 5, 9])
+    template = xr.concat([da.to_dataset().isel(x=[i]) for i in [1, 5, 9]], dim="x")
     with raise_if_dask_computes():
         actual = xr.map_blocks(func, da, template=template)
     assert_identical(actual, template)
 
-    ds = da.to_dataset()
     func = lambda x: x.to_dataarray().isel(x=[1])
-    template = ds.to_dataarray().isel(x=[1, 5, 9])
+    template = xr.concat([ds.to_dataarray().isel(x=[i]) for i in [1, 5, 9]], dim="x")
     with raise_if_dask_computes():
         actual = xr.map_blocks(func, ds, template=template)
     assert_identical(actual, template)
@@ -1429,7 +1433,7 @@ def test_map_blocks_errors_bad_template(obj):
         xr.map_blocks(
             lambda a: a.isel(x=[1]).assign_coords(x=[120]),  # assign bad index values
             obj,
-            template=obj.isel(x=[1, 5, 9]),
+            template=xr.concat([obj.isel(x=[i]) for i in [1, 5, 9]], dim="x"),
         ).compute()
 
 

xarray/tests/test_variable.py

@@ -318,12 +318,11 @@ def test_datetime64_valid_range(self):
         with pytest.raises(pderror, match=r"Out of bounds nanosecond"):
             self.cls(["t"], [data])
 
-    @pytest.mark.xfail(reason="pandas issue 36615")
     @pytest.mark.filterwarnings("ignore:Converting non-nanosecond")
     def test_timedelta64_valid_range(self):
         data = np.timedelta64("200000", "D")
         pderror = pd.errors.OutOfBoundsTimedelta
-        with pytest.raises(pderror, match=r"Out of bounds nanosecond"):
+        with pytest.raises(pderror, match=r"Cannot convert"):
             self.cls(["t"], [data])
 
     def test_pandas_data(self):
@@ -2301,20 +2300,20 @@ def test_chunk(self):
         assert blocked.chunks == ((3,), (3, 1))
         assert blocked.data.name != first_dask_name
 
-    @pytest.mark.xfail
+    @pytest.mark.skip
     def test_0d_object_array_with_list(self):
         super().test_0d_object_array_with_list()
 
-    @pytest.mark.xfail
+    @pytest.mark.skip
     def test_array_interface(self):
         # dask array does not have `argsort`
         super().test_array_interface()
 
-    @pytest.mark.xfail
+    @pytest.mark.skip
     def test_copy_index(self):
         super().test_copy_index()
 
-    @pytest.mark.xfail
+    @pytest.mark.skip
     @pytest.mark.filterwarnings("ignore:elementwise comparison failed.*:FutureWarning")
     def test_eq_all_dtypes(self):
         super().test_eq_all_dtypes()