def test_rename_inplace(self):
times = pd.date_range('2000-01-01', periods=3)
data = Dataset({'z': ('x', [2, 3, 4]), 't': ('t', times)})
copied = data.copy()
renamed = data.rename({'x': 'y'})
data.rename({'x': 'y'}, inplace=True)
self.assertDatasetIdentical(data, renamed)
self.assertFalse(data.equals(copied))
self.assertEquals(data.dims, {'y': 3, 't': 3})
# check virtual variables
self.assertArrayEqual(data['t.dayofyear'], [1, 2, 3])
