def test_delete_event():
tracker = Tracker()
tracker.add_event('Buy toothpaste', 1900)
tracker.add_event('Go to the gym', 2000)
tracker.delete_event('Go to the gym')
assert tracker.get_event_time('Go to the gym') == None
assert tracker.get_event_time('Buy toothpaste') == 1900
def test_fetch_soonest_event():
tracker = Tracker()
tracker.add_event('Buy snacks', 700)
tracker.add_event('Go shopping', 1200)
tracker.add_event('Eat something', 900)
assert tracker.fetch_soonest_event() == 'Buy snacks'
tracker.delete_event('Buy snacks')
assert tracker.fetch_soonest_event() == 'Eat something'
tracker.delete_event('Go shopping')
tracker.delete_event('Eat something')
assert tracker.fetch_soonest_event() == None
def test_add_event():
tracker = Tracker()
tracker.add_event('Buy toothpaste', 1800)
assert tracker.get_event_time('Buy toothpaste') == 1800
