AI API Specification → Test Cases

AI Test Generation

Paste an OpenAPI/Swagger snippet or describe endpoints in plain text to get per-operation test cases with request data and expected responses.

Privacy: Requires a free Mutqan account. Your input is sent to the Mutqan AI service to generate the result; prompts and results are not stored — only your account's usage counts for the daily allowance. How the AI tools work

What is API contract testing?

An API contract is the agreed description of an interface — its endpoints, parameters, request and response schemas and status codes — usually written as an OpenAPI document. Contract testing compares what a service actually returns with that description, so a renamed field or a changed type is caught by the producer or the consumer before it breaks the other side.

Read the guide: What is API Testing? How to Test a REST API

How to use AI API Specification → Test Cases

  1. Paste an OpenAPI 3 or Swagger 2 snippet (YAML or JSON), or describe the endpoints in plain text.
  2. Choose the focus — all categories, positive, negative, authentication/authorization, boundary or security — and the number of test cases (3 to 40).
  3. Pick the output language, press Generate, and check the detected operations table to confirm the tool read the scope you meant.
  4. Review each case's request, expected status and assertions, then download as CSV, Markdown or JSON.

AI API Specification → Test Cases features

  • Understands OpenAPI 3 / Swagger 2 snippets (JSON or YAML) and plain endpoint descriptions
  • Per-operation cases with request (method, path, headers, query, body), expected status and assertions
  • Focus selector: all, positive, negative, auth, boundary or security
  • Detected operations table plus Markdown/CSV/JSON export

AI API Specification → Test Cases example

Spec → API tests

Input:

DELETE /lookups/{lookup}/values/{id} → 204 / 403 / 409

Output:

API-001 Delete unreferenced value → 204
API-002 Delete as Viewer → 403
API-003 Delete referenced value → 409 with reference count
…

Frequently asked questions about AI API Specification → Test Cases

Does it need a full OpenAPI file?

No. A snippet with a few paths or even a plain-text description of the endpoints works; the AI lists the operations it detected so you can confirm the scope.

Which status code will a test expect?

The one your spec lists for that situation. When the spec lists none, the tool follows REST conventions — 201 for a create, 204 for a delete, 400 or 422 for validation errors, 401 or 403 for authentication and authorisation, 404 for a missing resource and 409 for a conflict.

Are security tests included?

With the focus on All categories or Security, operations also get checks such as injection payloads, access to another user's object (IDOR) and excessive data in the response, alongside authentication and authorisation failures.

Technical notes

Each case names the operation ("METHOD /path"), a type and a P0–P3 priority, a complete request (method, concrete path, headers, query string and JSON body), the expected status code, the expected response and one to twelve explicit assertions. Status codes follow the spec when it lists responses, and REST conventions otherwise.

The AI never invents endpoints that are not in the contract; when the spec is ambiguous the notes field records the assumption.

References

  • OpenAPI SpecificationOpenAPI InitiativeThe standard for describing REST APIs: paths, operations, parameters, schemas, responses and security schemes.
  • JSON Schema SpecificationJSON SchemaThe vocabulary for describing and validating the shape of JSON documents (types, required properties, formats).
  • RFC 9110: HTTP SemanticsIETF · 2022The meaning of HTTP methods, header fields, status codes and content negotiation, independent of the wire version.