Conformance 311

[funkyshu]

Fixes #311

[Copilot]

Pull request overview

Refactors backend/testsuite into an exported conformance test suite so individual backends (including contrib) can run standardized integration tests directly, while keeping the centralized VFS_INTEGRATION_LOCATIONS runner.

Changes:

• Exported reusable conformance test entry points (filesystem/location/file + IO behaviors) from backend/testsuite.
• Added per-backend conformance_test.go integration tests for core backends and new documentation explaining usage.
• Updated dependencies and minor backend improvements (mem seek bounds, preallocs, GCS context import).

Reviewed changes

Copilot reviewed 25 out of 26 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
go.mod	Bumps Go version and updates core dependencies (AWS/Azure/GCP, x/net, google api).
go.sum	Updates dependency checksums to match module upgrades.
docs/conformance_tests.md	Adds detailed documentation for running conformance tests per-backend and centrally.
docs/backend.md	Adds a “Testing Your Backend” section linking to conformance tests.
backend/testsuite/io_integration_test.go	Simplifies IO integration runner to call exported IO conformance functions and registers backends via backend/all.
backend/testsuite/io_conformance.go	Introduces exported IO conformance helpers and test case definitions.
backend/testsuite/doc.go	Updates package documentation to describe exported conformance entry points and usage patterns.
backend/testsuite/conformance.go	Adds exported conformance runners for filesystem/location/file behavior.
backend/testsuite/backend_integration_test.go	Refactors centralized runner to call exported conformance tests and retains GS-specific assertions.
backend/sftp/conformance_test.go	Adds per-backend SFTP conformance + IO integration tests behind vfsintegration tag.
backend/s3/conformance_test.go	Adds per-backend S3 conformance + IO integration tests behind vfsintegration tag.
backend/os/conformance_test.go	Adds per-backend OS conformance + IO integration tests behind vfsintegration tag.
backend/mem/readwriteseeker.go	Adds seek upper-bound validation to prevent int overflow.
backend/mem/fileSystem.go	Preallocates key slice capacity for efficiency.
backend/mem/file.go	Adds seek-position bounds check before updating internal state.
backend/mem/conformance_test.go	Adds per-backend mem conformance + IO integration tests behind vfsintegration tag.
backend/gs/options.go	Adds linter suppression comment for deprecated-but-functional credentials option.
backend/gs/location_test.go	Preallocates slice capacity for efficiency.
backend/gs/fileSystem.go	Switches to standard context import (removes x/net/context).
backend/gs/conformance_test.go	Adds per-backend GS conformance + IO integration tests behind vfsintegration tag.
backend/ftp/options.go	Preallocates cipher suite slice capacity for efficiency.
backend/ftp/conformance_test.go	Adds per-backend FTP conformance + IO integration tests behind vfsintegration tag.
backend/azure/conformance_test.go	Adds per-backend Azure conformance + IO integration tests behind vfsintegration tag.
README.md	Links to new conformance test documentation.
CHANGELOG.md	Documents new conformance test exports, per-backend tests, docs, and dependency updates.
.testcoverage.yml	Excludes conformance helper sources from coverage thresholds.

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