Implement undefined method in Encoding class

[tomlutzenberger]

The __toString method was missing/not implemented, even though it is called in some cases.

Fixes #364

[k00ni]

@tomlutzenberger Thank you for your contribution!

Can you please fix coding style issues (run vendor/bin/php-cs-fixer fix) and add at least one test, which demonstrates the original problem and your fix?

[tomlutzenberger]

I fixed the issues but was not able to even run the existing tests. It seems PHPUnit is not a dependency and is therefore not found in PHPStorm.
Do I miss something here?

[k00ni]

We use symfony/phpunit-bridge which allows us to run PHPUnit on PHP 5.6 - 7.4. You can run tests locally by executing vendor/bin/simple-phpunit. It will install PHPUnit in a sub-folder and run tests. Might need to set <env name="SYMFONY_PHPUNIT_VERSION" value="7.5"/> in phpunit.xml though.

[tomlutzenberger]

It's hard to understand the logic in the Font class without any method documentation, especially the character translation and encoding part. Even though I spent almost all day to get the tests up and running, I wasn't able to write a test due to lack of knowledge about the structure of PDF files 😞

[k00ni]

I took the liberty and added a few tests which proof your fix is working. Looks good now. Thank you for your effort.