test: add property-based tests and integration tests for retry-on-ratelimit

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Add 302 property-based unit tests (proptest, 100+ iterations each) and
13 integration test scenarios covering all retry behaviors.

Unit tests cover:
- Configuration round-trip parsing, defaults, and validation
- Status code range expansion and error classification
- Exponential backoff formula, bounds, and scope filtering
- Provider selection strategy correctness and fallback ordering
- Retry-After state scope behavior and max expiration updates
- Cooldown exclusion invariants and initial selection cooldown
- Bounded retry (max_attempts + budget enforcement)
- Request preservation across retries
- Latency trigger sliding window and block state management
- Timeout vs high-latency precedence
- Error response detail completeness

Integration tests (tests/e2e/):
- IT-1 through IT-13 covering 429/503 retry, exhaustion, backoff,
  fallback priority, Retry-After honoring, timeout retry, high-latency
  failover, streaming preservation, and body preservation

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raheelshahzad 2026-03-08 18:45:19 -07:00

parent 9870be530c

commit 98bf02456a

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tests/e2e/test_retry_integration.py Normal file

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