Test for interaction of multiple assignment plugins

Problem/Motivation

Several current bugs represent regressions that are most evident in the interaction between multiple assignment plugins. Examples:

• #2832184: Namespace assignment method not matching field names like field_article_type
• #2832261: assignConfigDependents() runs too early in default assignments
• #2832170: Namespace assignment method broken for existing features with custom bundle

However, currently, we have tests for the individual plugins, but not for how they interact.

Proposed resolution

• Write a test to:
• Install the standard install profile.
• Create additional config as needed. Specifically:
  • To ensure that a field storage required by multiple packages is assigned to the core plugin, add field_tags and field_image fields to the page content type.
  • To test prefixing of fields, create a field storage field_article_test with accompanying field on the article content type.
• Enable all assignment plugins that are included in Features.
• Apply assignments.
• Test the resulting packages against a data structure representing the expected assignments per interoperability aims and principles.

Remaining tasks

User interface changes

API changes

Data model changes