Move package into src

Prevents accidental imports when running tests.
diff --git a/tests/test_tsafe.py b/tests/test_tsafe.py
new file mode 100644
index 0000000..97045ce
--- /dev/null
+++ b/tests/test_tsafe.py
@@ -0,0 +1,25 @@
+# Copyright (C) Jean-Paul Calderone
+# See LICENSE for details.
+
+"""
+Unit tests for :py:obj:`OpenSSL.tsafe`.
+"""
+
+from OpenSSL.SSL import TLSv1_METHOD, Context
+from OpenSSL.tsafe import Connection
+
+from .util import TestCase
+
+
+class ConnectionTest(TestCase):
+    """
+    Tests for :py:obj:`OpenSSL.tsafe.Connection`.
+    """
+    def test_instantiation(self):
+        """
+        :py:obj:`OpenSSL.tsafe.Connection` can be instantiated.
+        """
+        # The following line should not throw an error.  This isn't an ideal
+        # test.  It would be great to refactor the other Connection tests so
+        # they could automatically be applied to this class too.
+        Connection(Context(TLSv1_METHOD), None)