def test_alien_is_alive_method(self):
alien = Alien(0, 1)
alive_error = "Alien is dead while health is greater than 0."
dead_error = "Alien is alive while health is less than or equal to 0."
for _ in range(5):
alien.hit()
if alien.health > 0:
self.assertTrue(alien.is_alive(), msg=alive_error)
else:
self.assertFalse(alien.is_alive(), msg=dead_error)
def test_alien_hit_method(self):
# There are two valid interpretations for this method/task.
# `self.health -= 1` and `self.health = max(0, self.health - 1)`
# The tests for this task reflect this ambiguity.
data = [(1, (2,)), (2, (1,)), (3, (0,)), (4, (0, -1)), (5, (0, -2)), (6, (0, -3))]
for variant, (iterations, result) in enumerate(data, 1):
alien = Alien(2, 2)
with self.subTest(f'variation #{variant}', input=iterations, output=result):
error = ("Expected hit method to decrement health by 1. "
f"Health is {alien.health} when it should be {result}.")
for _ in range(iterations):
alien.hit()
self.assertIn(alien.health, result, msg=error)