def test_correct_fitness_calculated(self, example_properties_w_20):
"""
Checks that find_fitness method calculates correct value of fitness.
"""
animal = Animal(example_properties_w_20)
animal.find_fitness()
assert animal.fitness == approx(0.9983411986)
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_fitness_between_zero_and_one(self, example_properties_w_20):
"""
Checks that find_fitness method calculates a fitness between 0 and 1.
"""
animal = Animal(example_properties_w_20)
animal.find_fitness()
assert 0 <= animal.fitness <= 1
def test_true_if_birth_prob_one(self, example_properties_w_40):
"""
Tests the will_birth_take_place method by checking if True is returned
when the probability of giving birth is 1.
"""
animal = Animal(example_properties_w_40)
animal.find_fitness()
assert animal.will_birth_take_place(num_animals=6) is True
def test_correct_prob_of_birth(self, example_properties_w_40):
"""
Asserts that prob_give_birth calculates the correct probability of
giving birth.
"""
animal = Animal(example_properties_w_40)
animal.find_fitness()
assert animal.prob_give_birth(num_animals=6) == 1
def test_correct_prob_of_moving(self, example_properties_w_20):
"""
Asserts that prob_of_animal_moving calculates the correct probability
of moving.
"""
animal = Animal(example_properties_w_20)
animal.find_fitness()
assert animal.prob_of_animal_moving() == approx(0.3993364794)
def test_not_true_if_death_prob_is_one(self, example_properties_w_20):
"""
Assert that will_animal_live does not return True if probability of
dying is one.
"""
animal = Animal(example_properties_w_20)
animal.weight = 0
animal.find_fitness()
assert animal.will_animal_live() is not True
def test_fitness_zero_if_weight_zero(self, example_properties_w_20):
"""
Checks that find_fitness method calculates a fitness of zero if
weight of the animal is zero.
"""
animal = Animal(example_properties_w_20)
animal.weight = 0
animal.find_fitness()
assert animal.fitness == 0
def test_prob_of_birth_if_weight_less_than_limit(self,
example_properties_w_20):
"""
Asserts that prob_give_birth returns a probability of zero if the
mothers weight is less than the given limit.
"""
animal = Animal(example_properties_w_20)
animal.find_fitness()
assert animal.prob_give_birth(num_animals=6) == 0
def test_prob_of_birth_with_one_animal_in_cell(self,
example_properties_w_20):
"""
Asserts that if there is only one animal in the cell, then the
prob_give_birth method returns a probability of zero.
"""
animal = Animal(example_properties_w_20)
animal.find_fitness()
assert animal.prob_give_birth(num_animals=1) == 0
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
def test_false_if_rand_num_more_than_birth_prob(self, mocker):
"""
Tests will_birth_take_place method by checking if False is returned
when a random number larger than a specific probability is drawn.
"""
test_properties_prob = {"species": "animal", "age": 63, "weight": 30}
mocker.patch('numpy.random.random', return_value=0.95)
animal = Animal(test_properties_prob)
animal.find_fitness()
assert animal.will_birth_take_place(num_animals=6) is not True
def test_no_birth_if_baby_weight_is_zero(self, example_properties_w_40,
mocker):
"""
Tests birth_process method.
Asserts that no baby is born if the baby's birth weight is
equal to zero.
"""
mocker.patch('numpy.random.normal', return_value=0)
animal = Animal(example_properties_w_40)
animal.find_fitness()
assert animal.birth_process(num_animals=6) is None
def test_no_birth_when_mothers_weight_small(self, example_properties_w_40,
mocker):
"""
Asserts that no baby is born from running birth_process
when mother's weight is less than xi times baby's weight.
"""
mocker.patch('numpy.random.normal', return_value=50)
animal = Animal(example_properties_w_40)
animal.find_fitness()
baby_weight = animal.birth_process(num_animals=6)
assert baby_weight is None
def test_true_if_rand_num_more_than_death_prob(self,
example_properties_w_20,
mocker):
"""
Asserts that will_animal_live returns True if the random number is
larger than the death probability.
"""
mocker.patch('numpy.random.random', return_value=0.5)
animal = Animal(example_properties_w_20)
animal.find_fitness()
assert animal.will_animal_live() is True
def test_baby_weight_returned_when_mothers_weight_large_enough(
self, example_properties_w_40, mocker):
"""
After running birth_process, we check that a birth took place by
testing if baby's weight is a float of given value and that the baby's
weight times xi was smaller than the mother's weight.
"""
mocker.patch('numpy.random.normal', return_value=5.5)
animal = Animal(example_properties_w_40)
animal.find_fitness()
baby_weight = animal.birth_process(num_animals=6)
assert type(baby_weight) is float
assert baby_weight == 5.5
assert animal.weight > baby_weight * animal.params['xi']
def test_true_if_rand_num_less_than_birth_prob(self, mocker):
"""
Tests will_birth_take_place method. Checks if True is returned when
random number less than a specific probability is drawn.
"""
test_properties_num_less = {
"species": "animal",
"age": 63,
"weight": 30
}
mocker.patch('numpy.random.random', return_value=0.8)
animal = Animal(test_properties_num_less)
animal.find_fitness()
assert animal.will_birth_take_place(num_animals=6) is True
def test_mother_loses_weight_after_birth(self, example_properties_w_40,
mocker):
"""
Test birth_process method.
Asserts that mother loses weight equal to xi * baby's weight after
giving birth.
"""
mocker.patch('numpy.random.normal', return_value=5.5)
animal = Animal(example_properties_w_40)
animal.find_fitness()
initial_weight = animal.weight
birth_weight = animal.birth_process(num_animals=6)
assert animal.weight == initial_weight - \
(animal.params['xi'] * birth_weight)