Ensure logging is correctly disabled for pythonw usage.

Test that the instance klass is properly assigned.

Test that the instance klass is properly assigned.

Test that the instance klass is properly assigned.

Verify two traitlets of different types can be linked together using link.

Verify two traitlets of different types can be linked together using link.

We should be able to configure additional log handlers.

Ensure we don't try to open logs in order to close them (See #722). If you try to configure logging handlers whilst Python is shutting down y

With multiple config files (systemwide and users), we want compounding. If systemwide overwrite and user append, we want both in the

With multiple config files (systemwide and users), we want compounding. If both are lazy we still want a lazy config.

With multiple config files (systemwide and users), we want compounding. Prepend should prepend in the right order.

With multiple config files (systemwide and users), we want compounding. Both prepending should be lazy

With multiple config files (systemwide and users), we want compounding. dict update should be in the right order.

With multiple config files (systemwide and users), we want compounding. Later dict overwrite laziness

With multiple config files (systemwide and users), we want compounding. Later dict overwrite laziness

Verify that we can register the same validator to multiple names