[Console] Adding an example of command test using the ApplicationTester class

[lkolndeep]

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• Completing the tip by adding a simple example of a test using the ApplicationTester class. It gives a good basis to start testing with this class.
• A correction in the caution part concerning the disabling of the auto exit flag

[carsonbot]

It looks like you unchecked the "Allow edits from maintainer" box. That is fine, but please note that if you have multiple commits, you'll need to squash your commits into one before this can be merged. Or, you can check the "Allow edits from maintainers" box and the maintainer can squash for you.

Cheers!

Carsonbot