Fix test.

Author: timcassell

src/BenchmarkDotNet/Toolchains/ToolchainExtensions.cs

@@ -27,14 +27,15 @@ private static IToolchain GetToolchain(Job job, Descriptor descriptor)
  ? toolchain
  : GetToolchain(
  job.ResolveValue(EnvironmentMode.RuntimeCharacteristic, EnvironmentResolver.Instance),
- descriptor);
+ descriptor,
+ job.HasValue(InfrastructureMode.NuGetReferencesCharacteristic) || job.HasValue(InfrastructureMode.BuildConfigurationCharacteristic));
 
- internal static IToolchain GetToolchain(this Runtime runtime, Descriptor descriptor = null)
+ internal static IToolchain GetToolchain(this Runtime runtime, Descriptor descriptor = null, bool preferMsBuildToolchains = false)
  {
  switch (runtime)
  {
  case ClrRuntime clrRuntime:
- if (RuntimeInformation.IsFullFramework &&
+ if (!preferMsBuildToolchains && RuntimeInformation.IsFullFramework &&
  // If dotnet SDK is not installed, we use RoslynToolchain (CsProjClassicNetToolchain currently does not support custom cli path).
  (!HostEnvironmentInfo.GetCurrent().IsDotNetCliInstalled()
  // Integration tests take too much time, because each benchmark run rebuilds the test suite and BenchmarkDotNet itself.

tests/BenchmarkDotNet.IntegrationTests/NugetReferenceTests.cs

@@ -21,7 +21,7 @@ public NuGetReferenceTests(ITestOutputHelper output) : base(output)
  [FactEnvSpecific("For some reason this test is unstable on Ubuntu for both AzureDevOps and Travis CI", EnvRequirement.NonLinux)]
  public void UserCanSpecifyCustomNuGetPackageDependency()
  {
- var toolchain = RuntimeInformation.GetCurrentRuntime().GetToolchain();
+ var toolchain = RuntimeInformation.GetCurrentRuntime().GetToolchain(preferMsBuildToolchains: true);
 
  var job = Job.Dry.WithToolchain(toolchain).WithNuGet("Newtonsoft.Json", "13.0.2");
  var config = CreateSimpleConfig(job: job);