Provide an example of how you would select test cases for a PUT request?

I would select test cases based on the following:

• Successful update:

  • Updating all fields with valid values.
  • Updating one or more fields, leaving others unchanged.
  • Updating fields with boundary values (if applicable).

• Unsuccessful update (negative tests):

  • Invalid data:
    • Incorrect data format for fields (e.g., string instead of number).
    • Values exceeding maximum length or outside the allowed range.
    • Missing required fields in the request body.
  • Non-existent resource:
    • PUT request with an ID that does not exist in the system.
  • Data conflict:
    • Attempting to update a resource that has been modified by another user (if versioning or locking mechanisms are used).
  • Permission issues:
    • Attempting to update a resource without proper access rights.
  • Validation errors:
    • Violations of business logic or database constraints (e.g., duplicate unique value).
  • Incorrect Content-Type:
    • Sending a request with a Content-Type different from expected (e.g., text/plain instead of application/json).
  • Empty request body:
    • Sending a request without a body.

• Boundary conditions:

  • Updating a resource with the minimal set of fields (if allowed).
  • Updating a resource with the maximum set of fields.
  • Testing behavior when additional, unexpected fields are included in the request body.

Example structure of test cases:

Case	Description	Expected result
Successful update	Updating all fields with correct values.	200 OK / 204 No Content (depends on API)
Non-existent ID	Attempting to update a resource with an ID that does not exist.	404 Not Found
Invalid data format	Attempting to update a numeric field with a string.	400 Bad Request
Missing required field	Missing a required field in the request body.	400 Bad Request
Insufficient permissions	Attempting to update a resource without necessary rights.	403 Forbidden

For automation, I would use frameworks like RestAssured (Java), Requests (Python), or Supertest (Node.js), along with tools for generating test data.