"""Protocol-level S3 contract check with botocore's validation stub (no live S3)."""
import io
import boto3
from botocore.response import StreamingBody
from botocore.stub import Stubber
from app.storage import Storage


def test_s3_private_round_trip_contract(tmp_path,monkeypatch):
    from app.config import settings
    from app.storage import storage
    monkeypatch.setenv('STORAGE_DIR',str(tmp_path)); monkeypatch.setenv('S3_BUCKET','test-private')
    settings.cache_clear(); storage.cache_clear()
    client=boto3.client('s3',region_name='us-east-1',aws_access_key_id='test',aws_secret_access_key='test')
    monkeypatch.setattr(boto3,'client',lambda *a,**kw:client)
    key='a'*48+'/input.SchDoc'; payload=b'actual bytes'
    with Stubber(client) as stub:
        stub.add_response('put_object',{}, {'Bucket':'test-private','Key':key,'Body':payload,'ContentType':'application/octet-stream'})
        stub.add_response('get_object',{'Body':StreamingBody(io.BytesIO(payload),len(payload))},{'Bucket':'test-private','Key':key})
        stub.add_response('delete_object',{}, {'Bucket':'test-private','Key':key})
        service=Storage();service.put(key,payload);assert service.get(key)==payload;service.delete(key)
        stub.assert_no_pending_responses()
    settings.cache_clear(); storage.cache_clear()