Problem/Motivation
In #2957381: Data model problems with Vocabulary hierarchy we added an update path test which tries to verify that an index exists by looking up its name. However, there are two problems with that approach:
- the real intention of the test was to check whether an index with a given set of columns exists on a table;
- on PostgreSQL, if the name of an index exceeds 63 chars (the identifier limit) and its table is renamed, the new name of the index can not be determined in any way.
Proposed resolution
Add a database schema introspection test trait and use it in \Drupal\Tests\taxonomy\Functional\Update\TaxonomyVocabularyHierarchyUpdateTest::testTaxonomyUpdateParents().
Remaining tasks
Review.
User interface changes
Nope.
API changes
A new trait is available for tests that need to check whether an index with a given set of columns exists.
Data model changes
Nope.
Release notes snippet
Nope.