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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"MSTests failing when importing a module with imports","articleBody":"Very simple to reproduce:\n\nIn the Python.EmbeddingTests project (I am using master branch):\n- Add reference to MSTest (Microsoft.VisualStudio.QualityTools.UnitTestFramework.dll 10.0.0.0)\n- Convert pyimport from NUnit to MSTest:\n  - remove NUnit Import, add using Microsoft.VisualStudio.TestTools.UnitTesting\n  - replace attributes with MStest attributes (TestClass, TestInitialise, TestCleanup, TestMethod)\n- Running TestDottedName works as expected.\n- Edit one.py and add `import numpy as np` as first line\n- Run TestDottedName should work first time\n- Run TestDottedName again, now it fails with:\n\n```\n\nTest method Python.EmbeddingTest.PyImportTest.TestDottedName threw exception: \nSystem.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.\n```\n\nThis error is also being shown in my ASP.Net Web API application on restart so I hope a solution will solve both MSTest and ASP.Net.\n\nFurther Information: Full version of pyimport.cs after edits is:\n\n```\nusing System;\nusing System.Reflection;\nusing Microsoft.VisualStudio.TestTools.UnitTesting;\nusing Python.Runtime;\n\nnamespace Python.EmbeddingTest\n{\n    [TestClass]\n    public class PyImportTest\n    {\n        private IntPtr gs;\n\n        [TestInitialize]\n        public void SetUp()\n        {\n            string path = @\"c:\\dev\\libs\\Anaconda3\\envs\\python2;\" + Environment.GetEnvironmentVariable(\"PATH\", EnvironmentVariableTarget.Machine);\n            Environment.SetEnvironmentVariable(\"PATH\", path, EnvironmentVariableTarget.Process);\n            Environment.SetEnvironmentVariable(\"PYTHONHOME\", @\"c:\\dev\\libs\\Anaconda3\\envs\\python2\", EnvironmentVariableTarget.Process);\n            Environment.SetEnvironmentVariable(\"PYTHONPATH \", @\"c:\\dev\\libs\\Anaconda3\\envs\\python2\\Lib\", EnvironmentVariableTarget.Process);\n\n            PythonEngine.Initialize();\n            gs = PythonEngine.AcquireLock();\n\n            //string here = Environment.CurrentDirectory;\n            //trunk\\pythonnet\\src\\embed_tests\\bin\\x86\\DebugWin\n\n            /*\n             * Append the tests directory to sys.path\n             * using reflection to circumvent the private modifires placed on most Runtime methods.\n             */\n            const string s = @\"../../../../tests\";\n\n            Type RTClass = typeof(Runtime.Runtime);\n\n            /* pyStrPtr = PyString_FromString(s); */\n            MethodInfo PyString_FromString = RTClass.GetMethod(\"PyString_FromString\",\n                BindingFlags.NonPublic | BindingFlags.Static);\n            object[] funcArgs = new object[1];\n            funcArgs[0] = s;\n            IntPtr pyStrPtr = (IntPtr)PyString_FromString.Invoke(null, funcArgs);\n\n            /* SysDotPath = sys.path */\n            MethodInfo PySys_GetObject = RTClass.GetMethod(\"PySys_GetObject\",\n                BindingFlags.NonPublic | BindingFlags.Static);\n            funcArgs[0] = \"path\";\n            IntPtr SysDotPath = (IntPtr)PySys_GetObject.Invoke(null, funcArgs);\n\n            /* SysDotPath.append(*pyStrPtr) */\n            MethodInfo PyList_Append = RTClass.GetMethod(\"PyList_Append\", BindingFlags.NonPublic | BindingFlags.Static);\n            funcArgs = new object[] { SysDotPath, pyStrPtr };\n            int r = (int)PyList_Append.Invoke(null, funcArgs);\n        }\n\n        [TestCleanup]\n        public void TearDown()\n        {\n            PythonEngine.ReleaseLock(gs);\n            PythonEngine.Shutdown();\n        }\n\n        [TestMethod]\n        public void TestDottedName()\n        {\n            PyObject module = PythonEngine.ImportModule(\"PyImportTest.test.one\");\n            Assert.IsNotNull(module, \"\u003e\u003e\u003e  import PyImportTest.test.one  # FAILED\");\n        }\n    }\n}\n```\n","author":{"url":"https://github.com/gatapia","@type":"Person","name":"gatapia"},"datePublished":"2016-09-07T23:12:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":12},"url":"https://github.com/262/pythonnet/issues/262"}