The test CommentNonNodeTest::testCommentFunctionality() is failing for MongoDB. In the test is a new comment type created, but no comment field is added to the entity_type "entity_test". The following error is given:
Drupal\Core\Entity\EntityStorageException: Cannot add embedded table data, because the table entity_test__field_foobar does not exist.
/var/www/html/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php:1421
/var/www/html/core/lib/Drupal/Core/Entity/EntityBase.php:354
/var/www/html/core/modules/comment/tests/src/Functional/CommentNonNodeTest.php:460
Caused by
Drupal\Core\Database\SchemaObjectDoesNotExistException: Cannot add embedded table data, because the table entity_test__field_foobar does not exist.
Run the test without the added comment field for MongoDB.
Add the comment field to the entity type "entity_test".
TBD
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As I read the test, the field 'foobar'. is created just a few lines later in $this->fieldUIAddNewField('entity_test/structure/entity_test', 'foobar', 'Foobar', 'comment', $storage_edit); via the UI. Am I wrong? Even if I am then how are current tests passing without the field?