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import click
import pytest
from buildstream._frontend.app import _prefix_choice_value_proc
def test_prefix_choice_value_proc_full_match():
value_proc = _prefix_choice_value_proc(['foo', 'bar', 'baz'])
assert "foo" == value_proc("foo")
assert "bar" == value_proc("bar")
assert "baz" == value_proc("baz")
def test_prefix_choice_value_proc_prefix_match():
value_proc = _prefix_choice_value_proc(['foo'])
assert "foo" == value_proc("f")
def test_prefix_choice_value_proc_ambigous_match():
value_proc = _prefix_choice_value_proc(['bar', 'baz'])
assert "bar" == value_proc("bar")
assert "baz" == value_proc("baz")
with pytest.raises(click.UsageError):
value_proc("ba")
def test_prefix_choice_value_proc_value_not_in_choices():
value_proc = _prefix_choice_value_proc(['bar', 'baz'])
with pytest.raises(click.UsageError):
value_proc("foo")
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