initial test of automatically using cubed

cubed_xarray/tests/test_wrapping.py

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+import xarray as xr
+from xarray.core.parallelcompat import list_chunkmanagers
+import cubed
+
+from cubed_xarray.cubedmanager import CubedManager
+
+
+class TestDiscoverCubedManager:
+    def test_list_cubedmanager(self):
+        chunkmanagers = list_chunkmanagers()
+        assert 'cubed' in chunkmanagers
+        assert isinstance(chunkmanagers['cubed'], CubedManager)
+
+    def test_chunk(self):
+        da = xr.DataArray([1, 2], dims='x')
+        chunked = da.chunk(x=1, chunked_array_type='cubed')
+        assert isinstance(chunked.data, cubed.Array)
+        assert chunked.chunksizes == {'x': (1, 1)}
+
+    # TODO test cubed is default when dask not installed
+
+    # TODO test dask is default over cubed when both installed