phpcs: Naming of GlobalFunctions tests classes.

phpcs: Naming of GlobalFunctions tests classes.

Code convensions:
 Class names should be UpperCamelCase.

And for PHPUnit:
 Class name should end in 'Test'.
 Class name should match file name.

Also made headers and spacing a bit more consistent.

Change-Id: Id7b6cec7e552240de44386b4759b57c2d37a39d1