[BUG] Setting body after make_case() causes request to be sent without a body

[simonhammes]

First off: Great library 💯

---

Checklist

• I checked the FAQ section of the documentation
• I looked for similar issues in the issue tracker
• I am using the latest version of Schemathesis

Describe the bug

The body is not sent if it is manipulated after calling make_case(). Setting body when calling make_case() works.

Related: #1094, #1188

To Reproduce

import schemathesis
from schemathesis import Case

schema = schemathesis.from_path(
    './petstore.yaml',
    base_url='http://127.0.0.1:4010',
    validate_schema=True,
)

def test_api():
    # This does not work:
    add_pet: Case = schema.get_operation_by_id('addPet').make_case() 
    add_pet.body = {'name': 'ABC'}
    response = add_pet.call_and_validate()
    # This will print None
    print(response.request.body)

    # This works instead:
    add_pet: Case = schema.get_operation_by_id('addPet').make_case(body={'name': 'ABC'})
    response = add_pet.call_and_validate()
    # This will print the request body
    print(response.request.body)

    # Capture stdout
    assert False

🚨 Mandatory 🚨: Steps to reproduce the behavior:

1. Download OpenAPI specification
2. Start mock server (e.g. using Prism)
3. pytest main.py

Please include a minimal API schema causing this issue:

https://github.com/OAI/OpenAPI-Specification/blob/main/examples/v3.0/petstore.yaml

Expected behavior

The body should be sent since the media type is specified in the OpenAPI specification.

Environment

- OS: Linux
- Python version: 3.12
- Schemathesis version: 3.28.1
- Spec version: OpenAPI 3.0.0

[Stranger6667]

@simonhammes

Thank you! I've been busy with other issues, but I hope to get back to this in a week or so. Sorry for the delay.

[Stranger6667]

The fix will be available in the next release