dotnet: Add RoutingSolver test.

examples/tests/RoutingSolverTests.cs

@@ -0,0 +1,40 @@
+using System;
+using Xunit;
+using Google.OrTools.ConstraintSolver;
+
+namespace Google.OrTools.Tests {
+  public class RoutingSolverTest {
+    [Theory]
+    [InlineData(false)]
+    [InlineData(true)]
+    public void SimpleLambdaCallback(bool callGC) {
+      // Create Routing Index Manager
+      RoutingIndexManager manager = new RoutingIndexManager(
+          5/*locations*/, 1/*vehicle*/, 0/*depot*/);
+      // Create Routing Model.
+      RoutingModel routing = new RoutingModel(manager);
+      // Create a distance callback.
+      int transitCallbackIndex = routing.RegisterTransitCallback(
+          (long fromIndex, long toIndex) => {
+          // Convert from routing variable Index to distance matrix NodeIndex.
+          var fromNode = manager.IndexToNode(fromIndex);
+          var toNode = manager.IndexToNode(toIndex);
+          return Math.Abs(toNode - fromNode);
+          });
+      // Define cost of each arc.
+      routing.SetArcCostEvaluatorOfAllVehicles(transitCallbackIndex);
+      if (callGC) {
+        GC.Collect();
+      }
+      // Setting first solution heuristic.
+      RoutingSearchParameters searchParameters =
+        operations_research_constraint_solver.DefaultRoutingSearchParameters();
+      searchParameters.FirstSolutionStrategy =
+        FirstSolutionStrategy.Types.Value.PathCheapestArc;
+      Assignment solution = routing.SolveWithParameters(searchParameters);
+      // 0 --(+1)-> 1 --(+1)-> 2 --(+1)-> 3 --(+1)-> 4 --(+4)-> 0 := +8
+      Assert.Equal(8, solution.ObjectiveValue());
+    }
+  }
+} // namespace Google.OrTools.Tests
+

examples/tests/RoutingSolverTests.csproj

@@ -0,0 +1,24 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <LangVersion>7.2</LangVersion>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <EnableDefaultItems>false</EnableDefaultItems>
+    <AssemblyName>Google.OrTools.RoutingSolverTests</AssemblyName>
+
+    <IsPackable>false</IsPackable>
+    <RestoreSources>../../packages;$(RestoreSources);https://api.nuget.org/v3/index.json</RestoreSources>
+  </PropertyGroup>
+
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugType>full</DebugType>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Include="RoutingSolverTests.cs" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.7.0" />
+    <PackageReference Include="xunit" Version="2.3.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" />
+    <PackageReference Include="Google.OrTools" Version="7.0.6170-*" />
+  </ItemGroup>
+</Project>

makefiles/Makefile.dotnet.mk

@@ -578,6 +578,7 @@ check_dotnet_pimpl: \
 .PHONY: test_dotnet_tests # Build and Run all .Net Tests (located in examples/test)
 test_dotnet_tests:
 	$(MAKE) run_test SOURCE=examples/tests/ConstraintSolverTests.cs
+	$(MAKE) run_test SOURCE=examples/tests/RoutingSolverTests.cs
 	$(MAKE) run SOURCE=examples/tests/issue18.cs
 	$(MAKE) run SOURCE=examples/tests/issue22.cs
 	$(MAKE) run SOURCE=examples/tests/issue33.cs