test(singleflight): add unit tests for DataReader functionality #2649
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WalkthroughTwo test files in the singleflight package received expanded test coverage for error-handling scenarios. New mock types ( Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~8 minutes
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Actionable comments posted: 0
🧹 Nitpick comments (2)
internal/storage/proxies/singleflight/data_reader_test.go (1)
315-341: Concurrent error handling test looks solid.The test correctly verifies that errors are broadcast to all concurrent requests waiting on the same singleflight call. Proper use of
sync.WaitGroupand atomic operations ensures race-free counting.Optionally, you could also verify that only one call reaches the delegate (similar to the successful case tests), which would more completely validate the singleflight behavior under error conditions. However, the current test adequately validates the error broadcasting mechanism.
internal/storage/proxies/singleflight/schema_reader_test.go (1)
295-321: Concurrent error test correctly validates error broadcasting.The test properly verifies that all concurrent goroutines waiting on the same singleflight call receive the error. Good use of atomic operations and WaitGroups for synchronization.
Similar to the DataReader tests, you could optionally add verification that only one delegate call is made, which would provide more complete coverage of singleflight behavior under error conditions.
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📒 Files selected for processing (2)
internal/storage/proxies/singleflight/data_reader_test.go(5 hunks)internal/storage/proxies/singleflight/schema_reader_test.go(5 hunks)
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🧬 Code graph analysis (2)
internal/storage/proxies/singleflight/schema_reader_test.go (3)
internal/storage/storage.go (2)
NoopSchemaReader(124-124)NewNoopSchemaReader(126-128)internal/storage/proxies/singleflight/schema_reader.go (1)
NewSchemaReader(20-22)pkg/database/pagination.go (1)
Pagination(21-24)
internal/storage/proxies/singleflight/data_reader_test.go (3)
internal/storage/storage.go (2)
NoopDataReader(42-42)NewNoopRelationshipReader(44-46)internal/storage/proxies/singleflight/data_reader.go (1)
NewDataReader(21-23)pkg/database/pagination.go (2)
CursorPagination(52-56)Pagination(21-24)
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🔇 Additional comments (12)
internal/storage/proxies/singleflight/data_reader_test.go (6)
5-5: LGTM!The new imports support error handling tests and parameter types for the delegation tests.
Also applies to: 14-15
51-58: LGTM!The
ErrorMockDataReadercorrectly simulates delegate failures for error-handling tests. The implementation is clean and consistent with the existingMockDataReaderpattern.
82-97: LGTM!The constructor tests properly verify both normal initialization and nil-delegate handling, ensuring the wrapper doesn't panic with invalid input.
99-181: Delegation tests provide good coverage of the proxy methods.These tests verify that the DataReader wrapper correctly delegates to the underlying reader for all relationship and attribute operations. Using
NoopRelationshipReaderis appropriate for testing the delegation mechanism without requiring complex test fixtures.
294-302: LGTM!The error propagation test correctly verifies that delegate errors are properly surfaced through the singleflight wrapper.
304-313: Context cancellation test is appropriately scoped.The test correctly focuses on ensuring no panic occurs with a cancelled context. The comment acknowledges that the specific behavior depends on the singleflight implementation and timing, which is a reasonable limitation for this test.
internal/storage/proxies/singleflight/schema_reader_test.go (6)
5-5: LGTM!Import additions are necessary for the new error handling and delegation tests.
Also applies to: 14-14
49-56: LGTM!The
ErrorMockSchemaReaderimplementation is correct and mirrors the pattern used inErrorMockDataReader, ensuring consistency across the test suite.
80-95: LGTM!Constructor tests properly validate both standard initialization and edge cases like nil delegates.
97-161: Delegation tests are well-documented and comprehensive.These tests verify that SchemaReader correctly delegates to the underlying reader. The comments documenting
NoopSchemaReaderbehavior (empty version strings, nil returns) are particularly helpful for understanding the test expectations.
274-282: LGTM!Error propagation test correctly validates that delegate errors surface through the singleflight wrapper.
284-293: Context cancellation handling is appropriately tested.The test ensures no panic with cancelled contexts, which is the critical behavior. The comment appropriately acknowledges that exact behavior depends on timing and singleflight implementation details.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #2649 +/- ##
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+ Coverage 82.21% 82.51% +0.29%
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Files 74 74
Lines 8132 8132
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+ Hits 6686 6710 +24
+ Misses 929 906 -23
+ Partials 517 516 -1 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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