Test method Python.EmbeddingTest.PyImportTest.TestDottedName threw exception: 
System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

using System;
using System.Reflection;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using Python.Runtime;

namespace Python.EmbeddingTest
{
    [TestClass]
    public class PyImportTest
    {
        private IntPtr gs;

        [TestInitialize]
        public void SetUp()
        {
            string path = @"c:\dev\libs\Anaconda3\envs\python2;" + Environment.GetEnvironmentVariable("PATH", EnvironmentVariableTarget.Machine);
            Environment.SetEnvironmentVariable("PATH", path, EnvironmentVariableTarget.Process);
            Environment.SetEnvironmentVariable("PYTHONHOME", @"c:\dev\libs\Anaconda3\envs\python2", EnvironmentVariableTarget.Process);
            Environment.SetEnvironmentVariable("PYTHONPATH ", @"c:\dev\libs\Anaconda3\envs\python2\Lib", EnvironmentVariableTarget.Process);

            PythonEngine.Initialize();
            gs = PythonEngine.AcquireLock();

            //string here = Environment.CurrentDirectory;
            //trunk\pythonnet\src\embed_tests\bin\x86\DebugWin

            /*
             * Append the tests directory to sys.path
             * using reflection to circumvent the private modifires placed on most Runtime methods.
             */
            const string s = @"../../../../tests";

            Type RTClass = typeof(Runtime.Runtime);

            /* pyStrPtr = PyString_FromString(s); */
            MethodInfo PyString_FromString = RTClass.GetMethod("PyString_FromString",
                BindingFlags.NonPublic | BindingFlags.Static);
            object[] funcArgs = new object[1];
            funcArgs[0] = s;
            IntPtr pyStrPtr = (IntPtr)PyString_FromString.Invoke(null, funcArgs);

            /* SysDotPath = sys.path */
            MethodInfo PySys_GetObject = RTClass.GetMethod("PySys_GetObject",
                BindingFlags.NonPublic | BindingFlags.Static);
            funcArgs[0] = "path";
            IntPtr SysDotPath = (IntPtr)PySys_GetObject.Invoke(null, funcArgs);

            /* SysDotPath.append(*pyStrPtr) */
            MethodInfo PyList_Append = RTClass.GetMethod("PyList_Append", BindingFlags.NonPublic | BindingFlags.Static);
            funcArgs = new object[] { SysDotPath, pyStrPtr };
            int r = (int)PyList_Append.Invoke(null, funcArgs);
        }

        [TestCleanup]
        public void TearDown()
        {
            PythonEngine.ReleaseLock(gs);
            PythonEngine.Shutdown();
        }

        [TestMethod]
        public void TestDottedName()
        {
            PyObject module = PythonEngine.ImportModule("PyImportTest.test.one");
            Assert.IsNotNull(module, ">>>  import PyImportTest.test.one  # FAILED");
        }
    }
}