Update unit test after pydata#1522

Author: gimperiale

xarray/tests/test_dask.py

@@ -253,14 +253,12 @@ def test_concat_loads_coords(self):
         # Test that concat() computes dask-based, non-index
         # coordinates exactly once and loads them in the output,
         # while leaving the input unaltered.
-        y = build_dask_array()
+        y = build_dask_array('y')
         ds1 = Dataset(coords={'x': [1], 'y': ('x', y)})
         ds2 = Dataset(coords={'x': [1], 'y': ('x', [2.0])})
         assert kernel_call_count == 0
         ds3 = xr.concat([ds1, ds2], dim='z')
-        # BUG fixed in #1532 where getattr('to_dataset')
-        # will cause non-index coords to be computed.
-        assert kernel_call_count == 2
+        assert kernel_call_count == 1
         assert ds1['y'].data is y
         assert isinstance(ds3['y'].data, np.ndarray)
         assert ds3['y'].values.tolist() == [[1.0], [2.0]]