136 lines
3.9 KiB
C++
136 lines
3.9 KiB
C++
// Copyright 2010-2025 Google LLC
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "ortools/set_cover/capacity_model.h"
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#include <limits>
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#include "gtest/gtest.h"
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#include "ortools/base/gmock.h"
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namespace operations_research {
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namespace {
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using ::testing::EqualsProto;
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TEST(CapacityModel, ConstructorRequiresOneBound) {
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EXPECT_DEATH(CapacityModel(std::numeric_limits<CapacityWeight>::min(),
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std::numeric_limits<CapacityWeight>::max()),
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"min");
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}
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TEST(CapacityModel, WithMinimumWeightRequiresNonVacuousMinimum) {
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EXPECT_DEATH(CapacityModel::WithMinimumWeight(
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std::numeric_limits<CapacityWeight>::min()),
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"min");
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}
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TEST(CapacityModel, WithMaximumWeightRequiresNonVacuousMaximum) {
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EXPECT_DEATH(CapacityModel::WithMaximumWeight(
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std::numeric_limits<CapacityWeight>::max()),
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"min");
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}
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TEST(CapacityModel, SetMinimumCapacityRejectsPlusInfinity) {
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CapacityModel m(0, 1);
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EXPECT_DEATH(m.SetMinimumCapacity(std::numeric_limits<CapacityWeight>::max()),
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"max");
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}
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TEST(CapacityModel, SetMaximumCapacityRejectsMinusInfinity) {
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CapacityModel m(0, 1);
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EXPECT_DEATH(m.SetMaximumCapacity(std::numeric_limits<CapacityWeight>::min()),
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"min");
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}
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TEST(CapacityModel, ComputeFeasibilityWithNoTerms) {
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CapacityModel m(0, 1);
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EXPECT_TRUE(m.ComputeFeasibility());
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m.SetMinimumCapacity(-1);
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EXPECT_TRUE(m.ComputeFeasibility());
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m.SetMaximumCapacity(0);
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EXPECT_TRUE(m.ComputeFeasibility());
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m.SetMinimumCapacity(-2);
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m.SetMaximumCapacity(-1);
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EXPECT_FALSE(m.ComputeFeasibility());
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}
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TEST(CapacityModel, ComputeFeasibilityWithOnlyPositiveWeights) {
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CapacityModel m(0, 1);
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m.AddTerm(SubsetIndex(0), ElementIndex(0), 1);
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m.AddTerm(SubsetIndex(0), ElementIndex(1), 2);
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m.AddTerm(SubsetIndex(0), ElementIndex(2), 3);
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// Activation bounds: [0, 6].
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EXPECT_TRUE(m.ComputeFeasibility());
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m.SetMinimumCapacity(-1);
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EXPECT_TRUE(m.ComputeFeasibility());
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m.SetMaximumCapacity(-1);
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EXPECT_FALSE(m.ComputeFeasibility());
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m.SetMaximumCapacity(7);
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EXPECT_TRUE(m.ComputeFeasibility());
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m.SetMinimumCapacity(7);
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EXPECT_FALSE(m.ComputeFeasibility());
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}
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TEST(CapacityModel, ComputeFeasibilityWithOnlyNegativeWeights) {
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CapacityModel m(0, 1);
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m.AddTerm(SubsetIndex(0), ElementIndex(0), -1);
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m.AddTerm(SubsetIndex(0), ElementIndex(1), -2);
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m.AddTerm(SubsetIndex(0), ElementIndex(2), -3);
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// Activation bounds: [-6, 0].
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EXPECT_TRUE(m.ComputeFeasibility());
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m.SetMaximumCapacity(1);
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EXPECT_TRUE(m.ComputeFeasibility());
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m.SetMinimumCapacity(1);
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EXPECT_FALSE(m.ComputeFeasibility());
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m.SetMinimumCapacity(-7);
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EXPECT_TRUE(m.ComputeFeasibility());
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m.SetMaximumCapacity(-7);
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EXPECT_FALSE(m.ComputeFeasibility());
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}
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TEST(CapacityModel, ComputeFeasibilityWithOnlyMixedWeights) {
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CapacityModel m(0, 1);
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m.AddTerm(SubsetIndex(0), ElementIndex(0), -1);
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m.AddTerm(SubsetIndex(0), ElementIndex(1), 2);
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m.AddTerm(SubsetIndex(0), ElementIndex(2), -3);
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// Activation bounds: [-4, 2].
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EXPECT_TRUE(m.ComputeFeasibility());
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m.SetMaximumCapacity(3);
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EXPECT_TRUE(m.ComputeFeasibility());
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m.SetMinimumCapacity(3);
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EXPECT_FALSE(m.ComputeFeasibility());
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m.SetMinimumCapacity(-5);
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EXPECT_TRUE(m.ComputeFeasibility());
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m.SetMaximumCapacity(-5);
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EXPECT_FALSE(m.ComputeFeasibility());
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}
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} // namespace
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} // namespace operations_research
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