Implement tacacs+ auth backend.

awx/sso/tests/functional/test_tacacsplus.py

@@ -0,0 +1,24 @@
+import pytest
+import mock
+
+
+@pytest.mark.django_db
+def test_fetch_user_if_exist(tacacsplus_backend, existing_tacacsplus_user):
+    new_user = tacacsplus_backend._get_or_set_user("foo", "password")
+    assert new_user == existing_tacacsplus_user
+
+
+@pytest.mark.django_db
+def test_create_user_if_not_exist(tacacsplus_backend, existing_tacacsplus_user):
+    with mock.patch('awx.sso.backends.logger') as mocked_logger:
+        new_user = tacacsplus_backend._get_or_set_user("bar", "password")
+        mocked_logger.debug.assert_called_once_with(
+            'Created TACACS+ user bar'
+        )
+        assert new_user != existing_tacacsplus_user
+
+
+@pytest.mark.django_db
+def test_created_user_has_no_usable_password(tacacsplus_backend):
+    new_user = tacacsplus_backend._get_or_set_user("bar", "password")
+    assert not new_user.has_usable_password()