81 lines
3.1 KiB
C++
81 lines
3.1 KiB
C++
// Copyright 2010-2024 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/graph/assignment.h"
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#include <limits>
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#include "gtest/gtest.h"
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namespace operations_research {
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TEST(SimpleLinearSumAssignmentTest, Empty) {
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SimpleLinearSumAssignment assignment;
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EXPECT_EQ(SimpleLinearSumAssignment::OPTIMAL, assignment.Solve());
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EXPECT_EQ(0, assignment.OptimalCost());
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EXPECT_EQ(0, assignment.NumArcs());
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EXPECT_EQ(0, assignment.NumNodes());
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}
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TEST(SimpleLinearSumAssignmentTest, OptimumMatching) {
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SimpleLinearSumAssignment assignment;
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EXPECT_EQ(0, assignment.AddArcWithCost(0, 0, 0));
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EXPECT_EQ(1, assignment.AddArcWithCost(0, 1, 2));
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EXPECT_EQ(2, assignment.AddArcWithCost(1, 0, 3));
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EXPECT_EQ(3, assignment.AddArcWithCost(1, 1, 4));
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EXPECT_EQ(2, assignment.NumNodes());
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EXPECT_EQ(4, assignment.NumArcs());
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EXPECT_EQ(SimpleLinearSumAssignment::OPTIMAL, assignment.Solve());
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EXPECT_EQ(4, assignment.OptimalCost());
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EXPECT_EQ(0, assignment.RightMate(0));
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EXPECT_EQ(0, assignment.AssignmentCost(0));
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EXPECT_EQ(1, assignment.RightMate(1));
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EXPECT_EQ(4, assignment.AssignmentCost(1));
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}
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TEST(SimpleLinearSumAssignmentTest, OptimumMatchingWithNegativeCost) {
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SimpleLinearSumAssignment assignment;
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assignment.AddArcWithCost(0, 0, 2);
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assignment.AddArcWithCost(0, 1, -10);
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assignment.AddArcWithCost(1, 0, 3);
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assignment.AddArcWithCost(1, 1, -20);
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EXPECT_EQ(SimpleLinearSumAssignment::OPTIMAL, assignment.Solve());
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EXPECT_EQ(-18, assignment.OptimalCost());
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EXPECT_EQ(0, assignment.RightMate(0));
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EXPECT_EQ(2, assignment.AssignmentCost(0));
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EXPECT_EQ(1, assignment.RightMate(1));
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EXPECT_EQ(-20, assignment.AssignmentCost(1));
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}
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TEST(SimpleLinearSumAssignmentTest, InfeasibleProblem) {
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SimpleLinearSumAssignment assignment;
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assignment.AddArcWithCost(0, 1, 2);
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assignment.AddArcWithCost(0, 1, -10);
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assignment.AddArcWithCost(1, 1, 3);
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assignment.AddArcWithCost(1, 1, -20);
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EXPECT_EQ(SimpleLinearSumAssignment::INFEASIBLE, assignment.Solve());
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EXPECT_EQ(0, assignment.OptimalCost());
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}
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TEST(SimpleLinearSumAssignmentTest, Overflow) {
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SimpleLinearSumAssignment assignment;
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assignment.AddArcWithCost(0, 0, std::numeric_limits<CostValue>::max());
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assignment.AddArcWithCost(0, 1, std::numeric_limits<CostValue>::max());
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assignment.AddArcWithCost(1, 0, std::numeric_limits<CostValue>::max());
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assignment.AddArcWithCost(1, 1, std::numeric_limits<CostValue>::max());
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EXPECT_EQ(SimpleLinearSumAssignment::POSSIBLE_OVERFLOW, assignment.Solve());
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EXPECT_EQ(0, assignment.OptimalCost());
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}
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} // namespace operations_research
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