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from unittest import mock
from myst_parser.cli import print_anchors
def test_print_anchors():
from io import StringIO
in_stream = StringIO("# a\n\n## b\n\ntext")
out_stream = StringIO()
with mock.patch("sys.stdin", in_stream):
with mock.patch("sys.stdout", out_stream):
print_anchors(["-l", "1"])
out_stream.seek(0)
assert out_stream.read().strip() == '<h1 id="a"></h1>'
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