Add unit tests for controllers

**Description**
Currently validation lacks proper import support.

**Proposed solution**
Add configurable import with sensible defaults.

**Priority**: Low/Medium

Start by locating the controllers and the existing validation or import logic, then inspect how controller tests are organized. Define the expected configurable import behavior and sensible defaults from the surrounding code, and add unit tests that demonstrate validation supports it.

Written by the indexing model from the issue text.