1 files changed, 73 insertions, 0 deletions

diff --git a/src/WixTestTools/WixTestContext.cs b/src/WixTestTools/WixTestContext.cs
new file mode 100644
index 00000000..c00f5723
--- /dev/null
+++ b/src/WixTestTools/WixTestContext.cs
@@ -0,0 +1,73 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixTestTools
+{
+    using System;
+    using System.IO;
+    using System.Linq;
+    using System.Reflection;
+    using Microsoft.Win32;
+    using WixBuildTools.TestSupport;
+    using Xunit.Abstractions;
+
+    public class WixTestContext
+    {
+        static readonly string RootDataPath = Path.GetFullPath(TestData.Get("TestData"));
+
+        public WixTestContext(ITestOutputHelper testOutputHelper)
+        {
+            var test = GetTest(testOutputHelper);
+            var splitClassName = test.TestCase.TestMethod.TestClass.Class.Name.Split('.');
+
+            this.TestGroupName = splitClassName.Last();
+            this.TestName = test.TestCase.TestMethod.Method.Name;
+
+            this.TestDataFolder = Path.Combine(RootDataPath, this.TestGroupName);
+        }
+
+        public string TestDataFolder { get; }
+
+        /// <summary>
+        /// Gets the name of the current test group.
+        /// </summary>
+        public string TestGroupName { get; }
+
+        public string TestName { get; }
+
+        /// <summary>
+        /// Gets the test install directory for the current test.
+        /// </summary>
+        /// <param name="additionalPath">Additional subdirectories under the test install directory.</param>
+        /// <returns>Full path to the test install directory.</returns>
+        /// <remarks>
+        /// The package or bundle must install into [ProgramFilesFolder]\~Test WiX\[TestGroupName]\([Additional]).
+        /// </remarks>
+        public string GetTestInstallFolder(string additionalPath = null)
+        {
+            return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86), "~Test WiX", this.TestGroupName, additionalPath ?? String.Empty);
+        }
+
+        /// <summary>
+        /// Gets the test registry key for the current test.
+        /// </summary>
+        /// <param name="additionalPath">Additional subkeys under the test registry key.</param>
+        /// <returns>Full path to the test registry key.</returns>
+        /// <remarks>
+        /// The package must write into HKLM\Software\WiX\Tests\[TestGroupName]\([Additional]).
+        /// </remarks>
+        public RegistryKey GetTestRegistryRoot(string additionalPath = null)
+        {
+            var key = String.Format(@"Software\WOW6432Node\WiX\Tests\{0}\{1}", this.TestGroupName, additionalPath ?? String.Empty);
+            return Registry.LocalMachine.OpenSubKey(key, true);
+        }
+
+        private static ITest GetTest(ITestOutputHelper output)
+        {
+            // https://github.com/xunit/xunit/issues/416#issuecomment-378512739
+            var type = output.GetType();
+            var testMember = type.GetField("test", BindingFlags.Instance | BindingFlags.NonPublic);
+            var test = (ITest)testMember.GetValue(output);
+            return test;
+        }
+    }
+}