Sets the category of a test class.
Categories can be excluded from running tests, or explicitly included.

If categories are explicitly included, only non-excluded tests with explicitly included categories will be run.

To exclude categories, add a new system variable named "categories.exclude" with the names of the categories excluded.
To explicitly include categories, add a new system variable named "categories.include" with the names of the categories included.

Usage:
@TestCategory("NetworkTest")