def should_return_correct_value_when_used_as_a_callable(self):
# given
bounds = BoundingBox([(-2, 3)])
x = 2.5
# when
utility_function = NegativeQuadraticUtilityFunction(bounds=bounds)
# then
assert utility_function.evaluate(x) == utility_function(x)
def should_return_negative_square_inside_of_domain(self):
# given
bounds = BoundingBox([(-2, 3)])
x = 2.5
# when
utility_function = NegativeQuadraticUtilityFunction(bounds=bounds)
# then
assert utility_function.evaluate(x) == -(x * x)
def should_raise_exception_outside_of_domain(self):
# given
bounds = BoundingBox([(-2, 3)])
x = 5
# when
utility_function = NegativeQuadraticUtilityFunction(bounds=bounds)
# then
with pytest.raises(ValueError):
utility_function.evaluate(x)
def should_raise_exception_in_higher_dimensions(self):
# given
bounds = BoundingBox([(-2, 3), (3, 4)])
# when, then
with pytest.raises(ValueError):
NegativeQuadraticUtilityFunction(bounds=bounds)
def should_return_correct_bounds_in_one_dimension(self):
# given
bounds = BoundingBox([(-2, 3)])
# when
utility_function = NegativeQuadraticUtilityFunction(bounds=bounds)
# then
assert utility_function.bounds == bounds
def should_return_correct_argmax_on_positive_interval_excluding_zero(self):
# given
bounds = BoundingBox([(2, 7)])
utility_function = NegativeQuadraticUtilityFunction(bounds=bounds)
# when
argmax = utility_function.argmax
# then
assert argmax == 2