from redlines import Redlines

test = Redlines("The quick brown fox jumps over the lazy dog.")
assert test.compare(
    'The quick brown fox walks past the lazy dog.') == "The quick brown fox <del>jumps over </del><ins>walks past </ins>the lazy dog."

assert test.compare(
    'The quick brown fox jumps over the dog.') == 'The quick brown fox jumps over the <del>lazy </del>dog.'