def should_work_with_backward_edits():
edit_0 = TextEdit("", start=0, end=1)
edit_1 = TextEdit("", start=1, end=2)
edit_2 = TextEdit("", start=2, end=3)
assert TextEdit.apply("AB", [edit_1, edit_0]) == ""
assert TextEdit.apply("ABC", [edit_1, edit_0, edit_0]) == ""
assert TextEdit.apply("ABC", [edit_2, edit_0]) == "B"
def should_work_for_multiple_edits():
# pos: 012345678901234567890123
text = "This is an example text."
edit_1 = TextEdit("", start=7, end=10)
edit_2 = TextEdit("!", start=len(text) - (10 - 7))
assert TextEdit.apply(text, [edit_1, edit_2]) == "This is example text.!"
edits = [
TextEdit(" ", start=5, end=5),
TextEdit("Word", start=6, end=6),
TextEdit("!", start=10, end=10),
]
assert TextEdit.apply("Hello", edits) == "Hello Word!"
def should_throw_an_exception_when_both_start_and_end_are_none():
with pytest.raises(ValueError):
TextEdit("")
def should_work_for_a_single_edit():
# pos: 012345678901234567890123
text = "This is an example text."
edit = TextEdit("", start=0, end=5)
assert TextEdit.apply(text, [edit]) == "is an example text."
edit = TextEdit("not ", start=8, end=8)
assert TextEdit.apply(text, [edit]) == "This is not an example text."
edit = TextEdit("..", start=len(text))
assert TextEdit.apply(text, [edit]) == "This is an example text..."
edit = TextEdit("", start=0)
assert TextEdit.apply(text, [edit]) == text
edit = TextEdit("", start=len(text))
assert TextEdit.apply(text, [edit]) == text
edit = TextEdit("", start=0, end=len(text))
assert TextEdit.apply(text, [edit]) == ""
edit = TextEdit("", start=0)
assert TextEdit.apply("", [edit]) == ""
edit = TextEdit("A", start=0)
assert TextEdit.apply("", [edit]) == "A"
def should_throw_an_exception_for_invalid_edits():
text = "This is an example text."
edit = TextEdit("", start=0, end=len(text) + 1)
with pytest.raises(TextEditOutOfBoundsException):
TextEdit.apply(text, [edit])
edit = TextEdit(" World!", start=6)
with pytest.raises(TextEditOutOfBoundsException):
TextEdit.apply("Hello", [edit])
edit = TextEdit("", start=0, end=1)
with pytest.raises(TextEditOutOfBoundsException):
TextEdit.apply("A", [edit, edit])
edit_1 = TextEdit("I", start=1, end=1)
edit_2 = TextEdit("I", start=2, end=3)
edit_2 = TextEdit("I", start=2, end=3)
with pytest.raises(TextEditOutOfBoundsException):
TextEdit.apply("A", [edit_1, edit_2])
def should_throw_an_exception_when_start_is_after_end():
with pytest.raises(ValueError):
edit = TextEdit("", start=1, end=0)
def should_throw_an_exception_when_start_or_end_are_negative():
with pytest.raises(ValueError):
edit = TextEdit("", start=-1, end=0)
with pytest.raises(ValueError):
edit = TextEdit("", start=0, end=-1)
def should_not_throw_an_exception_when_start_is_none():
edit = TextEdit("", end=0)
assert edit.text == ""
assert edit.start == 0
assert edit.end == 0