def test_fitness_update(self, mocker):
"""Tests that the fitness gets updated for given values of weight.
The mocker is used to give spesific values from random functions used
in the module.
"""
h = Herb()
c = Carn()
h.weight = -3
c.weight = -2
h.fitness_update()
c.fitness_update()
assert h.fitness == 0
assert c.fitness == 0
mocker.patch("numpy.random.normal", return_value=0)
h = Herb()
c = Carn()
h.fitness_update()
c.fitness_update()
assert h.fitness == 0
assert c.fitness == 0
mocker.patch("numpy.random.normal", return_value=1)
h = Herb()
c = Carn()
h.fitness_update()
c.fitness_update()
assert h.fitness == pytest.approx(
1 / (1 + m.exp(h.phi_age * (h.a - h.a_half))) * 1 /
(1 + m.exp(-h.phi_weight * (1 - h.w_half))))
assert c.fitness == pytest.approx(
1 / (1 + m.exp(c.phi_age * (c.a - c.a_half))) * 1 /
(1 + m.exp(-c.phi_weight * (1 - c.w_half))))
def test_fitness_update(self, mocker):
h = Herb()
c = Carn()
h.weight = -3
c.weight = -2
h.fitness_update()
c.fitness_update()
assert h.fitness == 0
assert c.fitness == 0
mocker.patch('numpy.random.normal', return_value=0)
h = Herb()
c = Carn()
h.fitness_update()
c.fitness_update()
assert h.fitness == 0
assert c.fitness == 0
mocker.patch('numpy.random.normal', return_value=1)
h = Herb()
c = Carn()
h.fitness_update()
c.fitness_update()
assert h.fitness == pytest.approx(
1 / (1 + m.exp(h.phi_age * (h.a - h.a_half))) * 1 /
(1 + m.exp(-h.phi_weight * (1 - h.w_half))))
assert c.fitness == pytest.approx(
1 / (1 + m.exp(c.phi_age * (c.a - c.a_half))) * 1 /
(1 + m.exp(-c.phi_weight * (1 - c.w_half))))