test_working.py

from working import convert
import pytest

def test_convert_positive():
    assert convert("9:00 AM to 5:00 PM") == "09:00 to 17:00"
    assert convert("9 AM to 5 PM") == "09:00 to 17:00"
    assert convert("10:30 PM to 8:50 AM") == "22:30 to 08:50"
    assert convert("10 PM to 8 AM") == "22:00 to 08:00"
    assert convert("12:00 PM to 12:00 AM") == "12:00 to 00:00"
    assert convert("12:00 AM to 12:00 PM") == "00:00 to 12:00"

def test_convert_negative():
    with pytest.raises(ValueError):
        convert("9:60 AM to 5:60 PM")
    with pytest.raises(ValueError):
        convert("9:60 AM to 5:00 PM")
    with pytest.raises(ValueError):
        convert("13:00 PM to 5:00 PM")
    with pytest.raises(ValueError):
        convert("9 AM - 5 PM")
    with pytest.raises(ValueError):
        convert("09:00 AM - 17:00 PM")
    with pytest.raises(ValueError):
        convert("Invalid time format")
    with pytest.raises(ValueError):
        convert("Missing time period")