Adding Schema Conformance Validation to Existing Tests

Use Schemathesis to validate API responses in your existing test suite without changing your current data generation or test structure.

validate_response() - Raises on Validation Errors

def test_get_user():
    response = requests.get("http://api.example.com/users/123")

    # Raises validation errors if response doesn't match schema
    schema["/users/{id}"]["GET"].validate_response(response)

is_valid_response() - Returns Boolean

def test_with_conditional_logic():
    response = requests.post(
        "http://api.example.com/users", json={"name": "Alice"}
    )

    assert schema["/users"]["POST"].is_valid_response(response):

Example

import pytest
import schemathesis

@pytest.fixture(scope="session")
def api_schema():
    return schemathesis.openapi.from_url("http://api.example.com/openapi.json")

def test_user_workflow(api_schema):
    create_response = requests.post(
        "http://api.example.com/users", json={"name": "Test"}
    )
    user_id = create_response.json()["id"]

    api_schema["/users"]["POST"].validate_response(create_response)

    get_response = requests.get(f"http://api.example.com/users/{user_id}")
    api_schema["/users/{id}"]["GET"].validate_response(get_response)

This approach adds schema validation while preserving your existing code.