def _validate_deletion(lineedit, method, text, deleted, rest):
"""Run and validate a text deletion method on the ReadLine bridge.
Args:
lineedit: The LineEdit instance.
method: Reference to the method on the bridge to test.
text: The starting 'augmented' text (see LineEdit.set_aug_text)
deleted: The text that should be deleted when the method is invoked.
rest: The augmented text that should remain after method is invoked.
"""
lineedit.set_aug_text(text)
method()
assert readlinecommands.bridge._deleted[lineedit] == deleted
assert lineedit.aug_text() == rest
lineedit.clear()
readlinecommands.rl_yank()
assert lineedit.aug_text() == deleted + '|'
def test_rl_yank_no_text(lineedit):
"""Test yank without having deleted anything."""
lineedit.clear()
readlinecommands.rl_yank()
assert lineedit.aug_text() == '|'