WIP: Adding tests for json_* subroutines in Test::Mojo.

[sergiotarxz]

Summary

Adding tests for json_* subroutines in Test::Mojo.

Motivation

Issue #1488

References

#1488

[sergiotarxz]

The result for json_message_has in the negative case is:

is_deeply \@args, ['ok', undef, 'has value for JSON Pointer "/test0"'];

Which appears sightly inconsistent with other negative cases being !!0 including json_has, probably not an issue but I think it is good to be known.

[mergify[bot]]

This pull request is now in conflicts. Could you fix it @sergiotarxz? 🙏

[mergify[bot]]

This pull request is now in conflicts. Could you fix it @sergiotarxz? 🙏