[Private: DO NOT MERGE] Editor mocks

[arnaudlewis]

Types of changes

• [ ] Bug fix (a non-breaking change which fixes an issue)
• [ ] New feature (a non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Description

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly. (PR: #)
• [ ] All new and existing tests are passing.