Coding Standards: Add visibility to methods in tests/phpunit/tests/
.
Adds a public
visibility to test fixtures, tests, data providers, and callbacks methods.
Adds a private
visibility to helper methods within test classes.
Renames callbacks and helpers that previously started with a _
prefix. Why? For consistency and to leverage using the method visibility. Further naming standardizations is beyond the scope of this commit.
Props costdev, jrf, hellofromTonya.
Fixes #54177.