[lihaojie-CMCC]

What type of PR is this?

• enhancement/feature

What this PR does / why we need it:

As reported in #88, a few test scenarios were missing to reach full coverage for the qa-assistant-service API.

Which issue(s) this PR fixes:

Fixes #88

Special notes for reviewers:

We have updated code/Test_definitions/qa-assistant-service.feature, adding 11 new scenarios (increasing the total from 15 to 26) to cover the Mandatory, Recommended, and Completeness suggestions from the issue.

Breakdown of added scenarios:

• Mandatory:
  • 400 invalid x-correlator (ensuring a valid body is provided first to avoid 400 due to missing prompt).
• Recommended:
  • 400 malformed assistantId format (using a non-UUID string).
• Coverage Completeness:
  • Request-body strictness: Added unknown property checks at the top level and nested levels (Scenario Outline).
  • Prompt validation: Added cases for empty prompt ("") and whitespace-only prompts.
  • Response field formats: Added assertions for both 400 error fields and 200 success fields against the schema.
  • Lifecycle state validation: Added happy-path scenarios verifying that the assistant exists, the assistant is active, and the referenced knowledge base is available.

[camara-validation]

CAMARA Validation — PASS

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