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from .optimize import Annealer

class NullAnnealer (Annealer):
    """ Simple dummy annealer for testing """
    def energy (self):
        return sum (self.state)

    def mutate (self):
        prev = self.energy ()
        self.state = [x-1 for x in self.state]
        return self.energy () - prev

def test_null_annealer ():
    dut = NullAnnealer ([1, 2, 3])
    optimal, energy = dut.run (1)
    assert optimal == [0, 1, 2]
    assert energy == sum ([0, 1, 2])-sum([1, 2, 3])
    assert dut.energy () == sum([0, 1, 2])