Added checking for socket before attempting to get session methods. Added test.

Author: pkittenis

ssh2/session.c

@@ -180,7 +180,7 @@ cdef class Session:
         return bool(rc)
 
     def userauth_list(self, username not None):
-        """Retrieve available authentication methods list.
+        """Retrieve available authentication methodslist.
 
         :rtype: list"""
         cdef bytes b_username = to_bytes(username)
@@ -762,6 +762,8 @@ cdef class Session:
 
         :rtype: str
         """
+        if not self.sock:
+            return
         with nogil:
             methods = c_ssh2.libssh2_session_methods(
                 self._session, method_type.value)

ssh2/session.pyx

@@ -1,4 +1,4 @@
-from ssh2.session import Session
+from ssh2.session import Session, LIBSSH2_METHOD_HOSTKEY
 
 from .base_test import SSH2TestCase
 
@@ -7,3 +7,8 @@ class SessionTestCase(SSH2TestCase):
     def test_session(self):
         session = Session()
         self.assertIsInstance(session, Session)
+
+    def test_methods(self):
+        session = Session()
+        methods = session.methods(LIBSSH2_METHOD_HOSTKEY)
+        self.assertIsNone(methods)