fceff86231
- Confirmed comprehensive 429 retry tests exist in proxy/retry_test.go - All tests pass with -race flag - Test coverage includes: - 429 with Retry-After header (delay honored, metric tracked, call counts verified) - 429 without Retry-After (exponential backoff, metric tracked, call counts verified) - Multiple retries, metric labels, concurrent scenarios - Integration tests with real ProxyHandler Co-Authored-By: Claude <noreply@anthropic.com>
88 lines
3.4 KiB
Markdown
88 lines
3.4 KiB
Markdown
# BF-244: Unit Tests for 429 Retry Logic
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## Summary
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Verified that comprehensive 429 retry unit tests already exist in `proxy/retry_test.go`.
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All tests pass with race detector (`go test ./proxy/ -run Test429 -race`).
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## Test Coverage
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### 429 with Retry-After Header Tests
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1. **Test429WithRetryAfterMetricVerification** (lines 1113-1185)
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- Verifies 429 with Retry-After header honors the delay before retry
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- Returns success after retry
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- Verifies exactly 2 upstream calls (initial + retry)
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- Verifies `zai_proxy_retry_attempts_total{reason="429"}` incremented exactly once
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- Verifies duration reflects Retry-After delay
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2. **TestIntegration429WithRetryAfter** (lines 1482-1544)
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- Integration test using real ProxyHandler
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- Verifies multiple 429s before success
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- Verifies upstream call count matches retries + 1
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- Verifies total duration reflects cumulative Retry-After delays
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### 429 without Retry-After Header Tests
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3. **Test429WithoutRetryAfterMetricVerification** (lines 1192-1254)
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- Verifies 429 without Retry-After uses exponential backoff
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- Returns 429 to client after MAX_RETRIES exhausted
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- Verifies exactly MAX_RETRIES+1 upstream calls (initial + retries)
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- Verifies `zai_proxy_retry_attempts_total{reason="429"}` incremented MAX_RETRIES times
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- Verifies duration reflects exponential backoff (1s + 2s for maxRetries=2)
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4. **TestIntegration429NoHeader** (lines 1547-1590)
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- Integration test using real ProxyHandler
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- Verifies exponential backoff behavior
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- Verifies 429 is surfaced after retries exhausted
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- Verifies upstream call count
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### Additional 429 Tests
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5. **Test429MultipleRetriesMetricVerification** (lines 1260-1328)
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- Tests multiple 429s before success
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- Verifies metric increments once per 429 response
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- Verifies upstream call count matches failure + success attempts
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6. **Test429MetricLabelVerification** (lines 1331-1370)
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- Verifies retry metric uses correct `reason="429"` label
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- Verifies other reason labels are not incremented
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- Ensures metric label integrity
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7. **Test429ConcurrentMetricVerification** (lines 1374-1450)
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- Tests concurrent 429 responses are tracked correctly
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- Verifies metric increments count concurrent retries
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- Verifies thread-safe metric handling
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## Acceptance Criteria Met
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✅ New tests in proxy/retry_test.go covering 429+Retry-After and 429 without Retry-After
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✅ Upstream call count assertions for each case
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✅ Metric assertions for retry attempts (zai_proxy_retry_attempts_total)
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✅ go test ./proxy/ -run Test429 passes with -race
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## Test Results
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All 429 tests pass successfully:
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```
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=== RUN Test429WithRetryAfterThenSuccess
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--- PASS: Test429WithRetryAfterThenSuccess (0.00s)
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=== RUN Test429WithoutRetryAfter
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--- PASS: Test429WithoutRetryAfter (0.00s)
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=== RUN Test429WithRetryAfterMetricVerification
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--- PASS: Test429WithRetryAfterMetricVerification (2.00s)
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=== RUN Test429WithoutRetryAfterMetricVerification
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--- PASS: Test429WithoutRetryAfterMetricVerification (3.00s)
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=== RUN Test429MultipleRetriesMetricVerification
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--- PASS: Test429MultipleRetriesMetricVerification (5.01s)
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=== RUN Test429MetricLabelVerification
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--- PASS: Test429MetricLabelVerification (1.00s)
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=== RUN Test429ConcurrentMetricVerification
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--- PASS: Test429ConcurrentMetricVerification (1.00s)
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PASS
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```
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Test file location: `/home/coding/zai-proxy/proxy/retry_test.go`
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Uses test infrastructure from: bf-3zp (mock upstream server, metrics verification)
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