def test_perturb_real_factor(self, factor):
explore = PerturbExplore(factor=factor)
rng = RNGStub()
rng.random = lambda: 1.0
assert explore.perturb_real(rng, 1.0, (0.1, 2.0)) == factor
rng.random = lambda: 0.0
assert explore.perturb_real(rng, 1.0, (0.1, 2.0)) == 1.0 / factor
def test_perturb_real_above_interval_cap(self):
explore = PerturbExplore(factor=1.0, volatility=0)
rng = RNGStub()
rng.random = lambda: 1.0
rng.normal = lambda mean, variance: variance
assert explore.perturb_real(rng, 3.0, (1.0, 2.0)) == 2.0
explore.volatility = 1000
assert explore.perturb_real(rng, 3.0, (1.0, 2.0)) == 1.0
def test_perturb_real_volatility_above(self, volatility):
explore = PerturbExplore(factor=1.0, volatility=volatility)
rng = RNGStub()
rng.random = lambda: 1.0
rng.normal = lambda mean, variance: variance
assert explore.perturb_real(rng, 3.0, (1.0, 2.0)) == 2.0 - volatility