This fixes various (not all) wrong @covers annotations that
are reported as warnings by PHPUnit when it's run with
code-coverage enabled.
When possible, the preferred solution is to change to
@covers at class level, that is the recommended way.
If multiple classes are involved, then a mix of @coversDefaultClass
and @covers at method level are used (always trying to use the
minimum needed patch).
This is the first of a series of issues created as sub-tasks
of MDL-82142.
While this change is not 100% required now, it's good habit
and we are checking for it since Moodle 4.4.
All the changes in this commit have been applied automatically
using the moodle.PHPUnit.TestReturnType sniff and are, exclusively
adding the ": void" return types when missing.
This issue just goes over all the currently incorrect
namespaces in test cases and:
1. Change the namespace to the correct one.
2. Move/rename it to correct location if needed (level 2 and down).
3. Remove not needed MOODLE_INTERNAL check when possible.
4. Remove file phpdoc when the file only has one class.
5. Make small adjustments in case the change of namespace requires it.