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from contextlib import contextmanager
import pytest
import altair.vegalite.v3 as alt
@contextmanager
def check_render_options(**options):
"""
Context manager that will assert that alt.renderers.options are equivalent
to the given options in the IPython.display.display call
"""
import IPython.display
def check_options(obj):
assert alt.renderers.options == options
_display = IPython.display.display
IPython.display.display = check_options
try:
yield
finally:
IPython.display.display = _display
def test_check_renderer_options():
# this test should pass
with check_render_options():
from IPython.display import display
display(None)
# check that an error is appropriately raised if the test fails
with pytest.raises(AssertionError):
with check_render_options(foo="bar"):
from IPython.display import display
display(None)
def test_display_options():
chart = alt.Chart("data.csv").mark_point().encode(x="foo:Q")
# check that there are no options by default
with check_render_options():
chart.display()
# check that display options are passed
with check_render_options(embed_options={"tooltip": False, "renderer": "canvas"}):
chart.display("canvas", tooltip=False)
# check that above options do not persist
with check_render_options():
chart.display()
# check that display options augment rather than overwrite pre-set options
with alt.renderers.enable(embed_options={"tooltip": True, "renderer": "svg"}):
with check_render_options(embed_options={"tooltip": True, "renderer": "svg"}):
chart.display()
with check_render_options(
embed_options={"tooltip": True, "renderer": "canvas"}
):
chart.display("canvas")
# check that above options do not persist
with check_render_options():
chart.display()
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