def test_allow_multiple_delimiters():
assert add_num("//[*][%]\n1*2%3") == 6
def test_single_number_converts_to_number():
assert add_num("1") == 1
assert add_num("5") == 5
def test_numbers_above_1000_are_ignored():
assert add_num("2,1001,1") == 3
def test_any_length_delimiter():
assert add_num("//[***]\n1***2***3") == 6
def test_empty_string_returns_0():
assert add_num("") == 0
def test_negative_can_be_delimiter_without_exception():
assert add_num("//-\n1-2") == 3
def test_negative_number_throws():
with pytest.raises(Exception) as ex:
add_num("1,2,-5")
assert '-5' in str(ex.value)
def test_delimiter_prefix():
assert add_num("//;\n1;2") == 3
def test_newlines_also_separates_input():
assert add_num("1\n2,3") == 6
def test_arbitrary_numbers_get_added():
assert add_num("1,2,3") == 6
def test_two_numbers_get_added():
assert add_num("1,2") == 3
