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test(streaming): tolerate Vertex 429 wrapped in MidStreamFallbackError (#28669)

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Streaming 429s are wrapped in MidStreamFallbackError so the Router can
fall back; the existing 'except litellm.RateLimitError: pass' in
test_vertex_ai_stream no longer matches, causing the generic
pytest.fail branch to fire when upstream Vertex returns 429.

Add a sibling except for MidStreamFallbackError that only swallows it
when e.original_exception is a RateLimitError, so unrelated streaming
failures still fail the test.
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yuneng-jiang 2026-05-22 15:57:29 -07:00 • committed by GitHub
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tests/local_testing/test_streaming.py
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@ -993,6 +993,11 @@ def test_vertex_ai_stream(provider):
except litellm.RateLimitError as e:
pass
except litellm.exceptions.MidStreamFallbackError as e:
# Streaming 429s are wrapped in MidStreamFallbackError so the
# Router can fall back; treat as a transient rate-limit pass.
if not isinstance(e.original_exception, litellm.RateLimitError):
pytest.fail(f"Error occurred: {e}")
except Exception as e:
pytest.fail(f"Error occurred: {e}")