def test_correct_prob_death(self, example_properties_w_20):
"""
Asserts that prob_death calculates the correct probability of dying.
"""
animal = Animal(example_properties_w_20)
animal.find_fitness()
assert animal.prob_death() == approx(0.0014929212599999687)
def test_prob_death_is_one_if_fitness_zero(self, example_properties_w_20):
"""
Asserts that the probability calculated from prob_death is one
if fitness equals zero.
"""
animal = Animal(example_properties_w_20)
animal.weight = 0
animal.find_fitness()
assert animal.prob_death() == 1
