1 files changed, 120 insertions, 0 deletions
diff --git a/test/ILLink.Tasks.IntegrationTests/TestContext.cs b/test/ILLink.Tasks.IntegrationTests/TestContext.cs
new file mode 100644
index 000000000..d8f7f0b6d
--- /dev/null
+++ b/test/ILLink.Tasks.IntegrationTests/TestContext.cs
@@ -0,0 +1,120 @@
+using System;
+using System.IO;
+using System.Linq;
+using Microsoft.DotNet.PlatformAbstractions;
+
+namespace ILLink.Tests
+{
+	public static class TestContext
+	{
+		/// <summary>
+		///   The name of the tasks package to add to the integration
+		///   projects.
+		/// </summary>
+		public static string TasksPackageName { get; private set; }
+
+		/// <summary>
+		///   The version of the tasks package to add to the
+		///   integration projects.
+		/// </summary>
+		public static string TasksPackageVersion { get; private set; }
+
+		/// <summary>
+		///   The path of the directory from which to get the linker
+		///   package.
+		/// </summary>
+		public static string PackageSource { get; private set; }
+
+		/// <summary>
+		///   The path to the dotnet tool to use to run the
+		///   integration tests.
+		/// </summary>
+		public static string DotnetToolPath { get; set; }
+
+		/// <summary>
+		///   The RID to use when restoring, building, and linking the
+		///   integration test projects.
+		/// </summary>
+		public static string RuntimeIdentifier { get; private set; }
+
+		/// <summary>
+		///   The configuration to use to build the integration test
+		///   projects.
+		/// </summary>
+		public static string Configuration { get; private set; }
+
+		/// <summary>
+		///   The root testbin directory. Used to install test
+		///   assets that don't depend on the configuration or
+		///   target framework.
+		/// </summary>
+		public static string TestBin { get; private set; }
+
+		static TestContext()
+		{
+			SetupDefaultContext();
+		}
+
+		/// <summary>
+		///   This is the context from which tests will be run in the
+		///   linker repo. The local directory that contains the
+		///   linker integration packages (hard-coded here) is
+		///   searched for the tasks package. This assumes that only
+		///   one version of the package is present, and uses it to
+		///   unambiguously determine which package to use in the tests.
+		/// </summary>
+		public static void SetupDefaultContext()
+		{
+			// test working directory is test project's <baseoutputpath>/<config>/<tfm>
+			var testBin = Path.Combine(Environment.CurrentDirectory, "..", "..");
+			var repoRoot = Path.GetFullPath(Path.Combine(testBin, "..", "..", ".."));
+
+			// We want to build and link integration projects in the
+			// release configuration.
+			Configuration = "Release";
+			TestBin = testBin;
+
+			// Locate task package
+			var packageName = "ILLink.Tasks";
+			var packageSource = Path.Combine(repoRoot, "artifacts", "packages", Configuration, "Shipping");
+			var tasksPackages = Directory.GetFiles(packageSource)
+				.Where(p => Path.GetExtension(p) == ".nupkg")
+				.Select(p => Path.GetFileNameWithoutExtension(p))
+				.Where(p => p.StartsWith(packageName));
+			var nPackages = tasksPackages.Count();
+			if (nPackages > 1) {
+				throw new Exception($"duplicate {packageName} packages in {packageSource}");
+			} else if (nPackages == 0) {
+				throw new Exception($"{packageName} package not found in {packageSource}");
+			}
+			var tasksPackage = tasksPackages.Single();
+			var version = tasksPackage.Remove(0, packageName.Length + 1);
+
+			// Locate dotnet host
+			var dotnetDir = Path.Combine(repoRoot, ".dotnet");
+			var dotnetToolName = Directory.GetFiles(dotnetDir)
+				.Select(p => Path.GetFileName(p))
+				.Where(p => p.StartsWith("dotnet"))
+				.Where(p => {
+					var ext = Path.GetExtension(p);
+					return ext == "" || ext == ".exe";
+				})
+				.Single();
+			var dotnetToolPath = Path.Combine(dotnetDir, dotnetToolName);
+
+			// Initialize static members
+			PackageSource = packageSource;
+			TasksPackageName = packageName;
+			TasksPackageVersion = version;
+			DotnetToolPath = dotnetToolPath;
+			// This sets the RID to the RID of the currently-executing system.
+			RuntimeIdentifier = RuntimeEnvironment.GetRuntimeIdentifier();
+			// workaround: the osx.10.13-x64 RID doesn't exist yet.
+			// see https://github.com/NuGet/Home/issues/5862
+			if (RuntimeIdentifier == "osx.10.14-x64")
+			{
+				RuntimeIdentifier = "osx.10.13-x64";
+			}
+		}
+	}
+}