Write the tests for init extension modules (#472).

test/test_evaluate/init_extension_module/module.c

@@ -0,0 +1,15 @@
+#include "Python.h"
+
+static struct PyModuleDef module = {
+   PyModuleDef_HEAD_INIT,
+   "init_extension_module",
+   NULL,
+   -1,
+   NULL
+};
+
+PyMODINIT_FUNC PyInit_init_extension_module(void){
+    PyObject *m = PyModule_Create(&module);
+    PyModule_AddObject(m, "foo", Py_None);
+    return m;
+}