- Add 9 new JSON export tests in dokumente/test_json.py
- Add 9 JSON tests to main dokumente/tests.py
- Fix Geltungsbereich field name issues in test setup
- Update test documentation with JSON test coverage
- Update test counts: Total 206 tests (was 188)
- JSON tests cover both management command and view functionality
- Tests include file output, stdout, error handling, and edge cases
- All 206 tests now passing
