Prompt Regression Test Suite Designer Prompt

Design a regression test suite for the prompt below.
Include:
- 8 test inputs (2 easy, 4 typical, 2 adversarial).
- For each, the expected output shape (not exact text) and what must NOT appear.
- A pass/fail rule (LLM-judge threshold or exact-match on a field).
- Which tests would catch each of: format drift, refusals, hallucination, and length regression.

Prompt:
{{prompt}}

Replace the {{fields}} with your own context and tighten the rules to match your domain.