def test_holoviews_pane_switch_backend(document, comm):
curve = hv.Curve([1, 2, 3])
pane = Pane(curve)
# Create pane
row = pane.get_root(document, comm=comm)
assert isinstance(row, BkRow)
assert len(row.children) == 1
model = row.children[0]
assert pane._models[row.ref['id']][0] is model
assert model.text.startswith('<img src=')
# Replace Pane.object
pane.backend = 'bokeh'
model = row.children[0]
assert isinstance(model, Figure)
# Cleanup
pane._cleanup(row)
assert pane._models == {}
