KnapsackSolverTest.java

// Copyright 2010-2021 Google LLC
// 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.

package com.google.ortools.algorithms;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;

import com.google.ortools.Loader;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

/** Test the Knapsack solver java interface. */
public final class KnapsackSolverTest {
  @BeforeEach
  public void setUp() {
    Loader.loadNativeLibraries();
  }

  @Test
  public void testKnapsackSolver() {
    final KnapsackSolver solver = new KnapsackSolver(
        KnapsackSolver.SolverType.KNAPSACK_MULTIDIMENSION_BRANCH_AND_BOUND_SOLVER, "test");
    assertNotNull(solver);

    final long[] profits = {360, 83, 59, 130, 431, 67, 230, 52, 93,
                            125, 670, 892, 600, 38, 48, 147, 78, 256,
                            63, 17, 120, 164, 432, 35, 92, 110, 22,
                            42, 50, 323, 514, 28, 87, 73, 78, 15,
                            26, 78, 210, 36, 85, 189, 274, 43, 33,
                            10, 19, 389, 276, 312};
    final long[][] weights = {{7, 0, 30, 22, 80, 94, 11, 81, 70,
                               64, 59, 18, 0, 36, 3, 8, 15, 42,
                               9, 0, 42, 47, 52, 32, 26, 48, 55,
                               6, 29, 84, 2, 4, 18, 56, 7, 29,
                               93, 44, 71, 3, 86, 66, 31, 65, 0,
                               79, 20, 65, 52, 13}};
    final long[] capacities = {850};
    solver.init(profits, weights, capacities);

    final long computedProfit = solver.solve();
    assertEquals(7534, computedProfit);
  }
}