Python: Copy Python extractor to codeql repo

python/extractor/tests/test_python_sanity.py

@@ -0,0 +1,23 @@
+import sys
+import unittest
+
+
+class PythonSanityTest(unittest.TestCase):
+    """Tests various implicit assumptions we have about Python behavior.
+
+    This is intended to catch changes that may break extraction in future
+    versions of Python.
+    """
+
+    def __init__(self, name):
+      super(PythonSanityTest, self).__init__(name)
+
+    def test_latin_1_encoding(self):
+        """Tests whether 'latin-1' acts as a "do nothing" encoding."""
+
+        s = bytes(range(256))
+        u = str(s, 'latin-1')
+        s_as_tuple = tuple(s)
+
+        u_as_tuple = tuple(map(ord, u))
+        assert u_as_tuple == s_as_tuple