# Copyright 2018 D-Wave Systems Inc.
#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS,
#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#    See the License for the specific language governing permissions and
#    limitations under the License.

import unittest

import dimod
import dimod.testing as dit


class MockSampler(unittest.TestCase):
    def test_instantiation(self):
        for factory in [dimod.ExactSolver, dimod.RandomSampler, dimod.SimulatedAnnealingSampler]:
            sampler = dimod.StructureComposite(factory(), [0, 1, 2], [(0, 1), (0, 2), (1, 2)])

            dit.assert_sampler_api(sampler)
            dit.assert_composite_api(sampler)
            dit.assert_structured_api(sampler)

    def test_sample(self):
        sampler = dimod.StructureComposite(dimod.NullSampler(),
                                           [0, 1, 2], [(0, 1), (0, 2)])

        sampler.sample_ising({0: 1}, {}).resolve()

        with self.assertRaises(ValueError):
            sampler.sample_ising({'a': 1}, {})  # wrong variables
        with self.assertRaises(ValueError):
            sampler.sample_ising({0: 1}, {(1, 2): 1})  # wrong interactions
