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import pytest
import altair.vegalite.v5 as alt
def test_layer_props():
"""Beginning in Vega-Lite v5, the properties "height" and "width" were no longer allowed in a subchart within a LayerChart. We check here that these are moved to the top level by Altair."""
base = alt.Chart().mark_point()
# Allowed
base.properties(width=100) + base
base.properties(width=100) + base.properties(height=200)
base.properties(width=100) + base.properties(height=200, width=100)
# Not allowed
with pytest.raises(ValueError, match="inconsistent"):
base.properties(width=100) + base.properties(width=200)
# Check that the resulting LayerChart has the correct properties.
c = base.properties(width=100) + base.properties(height=200, width=100)
assert isinstance(c, alt.LayerChart)
assert c.width == 100
assert c.height == 200
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