Add schemathesis tests

tests/dev.requirements.txt

@@ -12,12 +12,15 @@ gino-starlette==0.1.1
 asyncpg
 
 # Testing
-pytest
+openapi-spec-validator
+pytest; python_version != '3.9'
+pytest !=7.0.0; python_version == '3.9'
 pytest-virtualenv
 requests
 asynctest
 psycopg2
 pyodbc
+schemathesis
 
 # Linting
 flake8

tests/test_schemathesis.py

@@ -0,0 +1,25 @@
+import pytest
+import schemathesis
+from fastapi import FastAPI
+from schemathesis.specs.openapi.schemas import BaseOpenAPISchema
+
+
+@pytest.fixture()
+def app_schema(client) -> BaseOpenAPISchema:
+    """
+    Get an OpenAPI schema instance for the app created by the `client` fixture.
+    """
+    app: FastAPI = client.app
+    assert client.app is not None
+    openapi = app.openapi()
+    result = schemathesis.from_dict(openapi)
+    return result
+
+
+schema = schemathesis.from_pytest_fixture("app_schema")
+
+
+@schema.parametrize()
+def test_api(case, client):
+    """Run tests automatically generated by schemathesis."""
+    case.call_and_validate(session=client)