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"""Test general health of the fonts."""
import json
from nototools import render
_advance_cache = {}
def get_advances(text, font):
"""Get a list of horizontal advances for text rendered in a font."""
try:
return _advance_cache[(text, font)]
except KeyError:
pass
hb_output = render.run_harfbuzz_on_text(text, font, None)
hb_output = json.loads(hb_output)
advances = [glyph['ax'] for glyph in hb_output]
_advance_cache[(text, font)] = advances
return advances
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