Add tests

Hi I will try to work on that.

Hi I created a test to module, please revise.

Hi, i'll review it.

Hi test in drupal 10 version works correctly

Testing /app/modules/contrib/ckeditor_html_embed
.                                                                   1 / 1 (100%)

Time: 00:18.812, Memory: 10.00 MB

OK (1 test, 14 assertions)

In drupal 9.5 version test still passing but a warning is showed

Testing /app/web/modules/contrib/ckeditor_html_embed
S                                                                   1 / 1 (100%)

Time: 00:06.189, Memory: 10.00 MB

OK, but incomplete, skipped, or risky tests!
Tests: 1, Assertions: 1, Skipped: 1.

It happens because I'm extending the CKeditor class.

I don't know if maintainer prefer move to RTBC or needs work.

Hi, i reviewed this issue in two differents environments, one in D9.5.x and the other in D10.
The environment with D10 all the testes implemented work and pass succesfully, but the environment with D9.5.x presents a different result from the tests...
I'll let here some screenshots with the result.
By the way, i'll move this issue to RTBC, but if was needed any change on code the, i'll be happy to try help with that.