def test_breed_low_weight():
"""Test that a herbivore with a low weight cannot breed"""
herbivore = ani.Herbivores()
herbivore.weight = 1
cell = topo.Jungle()
cell.add_animal(herbivore)
herbivore.breed(cell, 100)
assert len(cell.herbivore_list) == 1
def test_breed_certain_probability_all_in_cell():
"""Tests that all animals breed, when the breeding-probability = 1"""
cell = topo.Jungle()
for _ in range(100):
cell.add_animal(animals.Herbivores(age=10, weight=100))
cell.add_animal(animals.Carnivores(age=10, weight=100))
cell.breed_all_animals_in_cell()
assert len(cell.herbivore_list) == 200
assert len(cell.carnivore_list) == 200
def test_animal_with_fitness_level_0_dies():
"""Test that an animal with a very low fitness dies"""
animal = animals.Herbivores(age=200, weight=1)
cell = topo.Jungle()
cell.add_animal(animal)
animals.Herbivores.parameters["omega"] = 1
cell.natural_death_all_animals_in_cell()
animals.Herbivores.parameters["omega"] = 0.4
assert len(cell.herbivore_list) == 0
def test_breed_certain_prob_overweight_newborn():
"""Tests that a herbivore cannot give birth to a child with
greater weight """
herbivore = ani.Herbivores(weight=50)
cell = topo.Jungle()
cell.add_animal(herbivore)
herbivore.parameters["xi"] = 100
herbivore.breed(cell, 1000)
herbivore.parameters["xi"] = 1.2
assert len(cell.herbivore_list) == 1
def test_feeding_carnivores_in_a_cell():
"""Tests if the most fit herbivore kills the least fit herbivore etc"""
animals.Carnivores.set_parameters({"DeltaPhiMax": 0.1})
jungle_cell = topo.Jungle()
[jungle_cell.add_animal(animals.Herbivores()) for _ in range(10)]
[jungle_cell.add_animal(animals.Carnivores(weight=80)) for _ in range(10)]
assert jungle_cell.biomass_carnivores() == 800
pre_feeding_herbi_biomass = jungle_cell.biomass_herbivores()
jungle_cell.feed_carnivores_in_cell()
assert pre_feeding_herbi_biomass > jungle_cell.biomass_herbivores()
def test_breed_certain_probability():
"""Test that a fit herbivore will give birth to another herbivore when the
breeding probability = 1"""
cell = topo.Jungle()
herbivore = ani.Herbivores()
herbivore.weight, herbivore.age = 80, 30
cell.add_animal(herbivore)
herbivore.breed(cell, 100)
assert len(cell.herbivore_list) == 2
assert isinstance(cell.herbivore_list[0], ani.Herbivores)
assert isinstance(cell.herbivore_list[1], ani.Herbivores)
def test_remove_carnivore():
"""Test that a carnivore can be removed"""
jungle_cell = topo.Jungle()
test_carnivore = animals.Carnivores()
jungle_cell.add_animal(test_carnivore)
assert test_carnivore in animals.Animals.instances
assert test_carnivore in jungle_cell.carnivore_list
jungle_cell.remove_animal(test_carnivore)
assert test_carnivore in animals.Animals.instances
assert test_carnivore not in jungle_cell.carnivore_list
animals.Animals.instances.remove(test_carnivore)
assert test_carnivore not in animals.Animals.instances
def low_fitness_animals():
"""Creates some test instances with very low fitness"""
jungle_cell = topo.Jungle()
herbivore = animals.Herbivores()
carnivore = animals.Carnivores()
carnivore.weight, carnivore.age = 1, 1000
herbivore.weight, herbivore.age = 1, 1000
herbivore.parameters["omega"] = 1
carnivore.parameters["omega"] = 1
jungle_cell.add_animal(herbivore)
jungle_cell.add_animal(carnivore)
return jungle_cell
def test_breed_uncertain_probability():
"""Test a herbivore will give birth to around 400 kids, when it trys 1000
times, when the probability for birth is around 0.4"""
born = 0
for _ in range(1000):
cell = topo.Jungle()
herbivore = ani.Herbivores()
herbivore.weight, herbivore.age = 400, 10
cell.add_animal(herbivore)
herbivore.breed(cell, 3)
if len(cell.herbivore_list) == 2:
born += 1
assert born > 350
assert born < 450
def test_herbivore_grazing():
"""Test that the herbivore cannot gain weight when grazing in a desert,
but gains weight when grazing in the jungle and savanna"""
herbivore = ani.Herbivores()
pre_eating_weight = herbivore.weight
desert_cell = topo.Desert()
herbivore.graze(desert_cell)
assert herbivore.weight == pre_eating_weight
jungle_cell = topo.Jungle()
herbivore.graze(jungle_cell)
assert herbivore.weight == pre_eating_weight + (
herbivore.parameters["beta"] * herbivore.parameters["F"])
after_jungle_graze = herbivore.weight
savanna_cell = topo.Savanna()
herbivore.graze(savanna_cell)
assert herbivore.weight == after_jungle_graze + (
herbivore.parameters["beta"] * herbivore.parameters["F"])
def test_feeding_herbivores_in_a_cell():
""" Tests the method "test_feeding_herbivores_in_a_cell" where the
least fittest animal shall in not be able to eat, due to overgrazing,
and therefore keep the same weight after the graze commando"""
jungle_cell = topo.Jungle()
animals.Herbivores.parameters["sigma_birth"] = 1.5
[jungle_cell.add_animal(animals.Herbivores()) for _ in range(81)]
herbivore_fitness_sort = sorted(jungle_cell.herbivore_list,
key=lambda herbi: herbi.fitness)
assert herbivore_fitness_sort[0].fitness < \
herbivore_fitness_sort[30].fitness
least_fittest_herb = herbivore_fitness_sort[0]
second_least_fittest_herb = herbivore_fitness_sort[1]
least_fittest_weight = least_fittest_herb.weight
second_least_fittest_weight = second_least_fittest_herb.weight
jungle_cell.feed_herbivores_in_cell()
assert least_fittest_weight == least_fittest_herb.weight
assert second_least_fittest_weight != second_least_fittest_herb.weight
# Test that the available fodder now are = 0, and that the increase_fodder
# works, so the food level again = f_max
assert jungle_cell.fodder == 0
jungle_cell.increase_fodder()
assert jungle_cell.fodder == 800
def basic_jungle():
"""Creates an non-populated test cell"""
return topo.Jungle()
