Add test coverage

The tests are uncovering an interesting bug:

Testing Drupal\Tests\graphql_webform\Kernel\Element\ManagedFileTest
E                                                                   1 / 1 (100%)R

Time: 00:00.816, Memory: 6.00 MB

There was 1 error:

1) Drupal\Tests\graphql_webform\Kernel\Element\ManagedFileTest::testManagedFile
LogicException: Missing type Integer.

It seems we are using the Integer type in a few elements such as WebformElementValidationLimit. This should be Int instead, ref. GraphQL: Basic types.

I created a followup to address this: 🐛 LogicException: Missing type Integer Fixed . I will for now mark the test as skipped. We can unskip it when the issue is fixed.

Tests are passing. This is by far not complete coverage, but the most common form elements are now covered. This already a much better baseline than having no coverage at all. Form submissions are not covered yet though.

I will merge this and will start tackling the open pull requests on Github, making sure they all get coverage as well.

Automatically closed - issue fixed for 2 weeks with no activity.