authentication plugin tests

[xabxx]

Feature request

Add tests for node_creation success

test_security includes tests that target the authentication plugin. I see that it's making the node_creation fail when security env. variables are not set or are not set correctly. Perhaps we should also add the successful cases where a node is authentication and able to be created.

[clalancette]

Perhaps we should also add the successful cases where a node is authentication and able to be created.

That sounds like a reasonable test to me. Please consider opening a pull request implementing that test. Thanks.