Add Py_GetVersion and a import test for decorator and oauth2client

src/runtime/builtin_modules/sys.cpp

@@ -249,6 +249,11 @@ static std::string generateVersionString() {
     return oss.str();
 }
 
+extern "C" const char* Py_GetVersion(void) noexcept {
+    static std::string version = generateVersionString();
+    return version.c_str();
+}
+
 static bool isLittleEndian() {
     unsigned long number = 1;
     char* s = (char*)&number;

test/integration/virtualenv_test.py

@@ -21,11 +21,13 @@ set -e
 set -ux
 python -c 'import __future__'
 python -c 'import sys; print sys.executable'
-pip install bcrypt==1.1.0 python-gflags==2.0 sqlalchemy==1.0.0 Pillow==2.8.1
+pip install bcrypt==1.1.0 python-gflags==2.0 sqlalchemy==1.0.0 Pillow==2.8.1 decorator oauth2client
 python -c 'import bcrypt; assert bcrypt.__version__ == "1.1.0"; assert bcrypt.hashpw("password1", "$2a$12$0123456789012345678901").endswith("I1hdtg4K"); print "bcrypt seems to work"'
 python -c 'import gflags; print "gflags imports"'
 python -c 'import sqlalchemy; print "sqlalchemy imports"'
 python -c 'from PIL import Image; print "Pillow imports"'
+python -c 'import decorator; print "decorator imports"'
+python -c 'import oauth2client; print "oauth2client imports"'
 """.strip()
 
 # print sh_script