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Added a new `fakectx` package to simplify creation of test contexts with specific behaviors, making it easier to fake it 'til you make it in your test suite!
Added usage examples and references for the fakectx package. Now, cancelling contexts is like waving a magic wand—wish granted! 🪄
Implemented new context helpers: `DeadlineExceeded`, `TimedOut`, and `TimesOutAfter`. Perfect for testing time-related conundrums. Pushing contexts beyond their limits, one test at a time!
Enhanced error checking in tests by adopting errors.Is. Now context errors are easier to spot.
Refined docstrings for clarity and added example tests for context helpers. Making testing as easy as pie!
Added the `CancelledWithCallback` function to invoke a callback upon context cancellation. No more excuses for lazy callbacks! Enhanced tests to ensure callbacks are punctual and polite.
Simplified example outputs for `fakectx` test functions. Because some truths deserve clarity!
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Note Other AI code review bot(s) detectedCodeRabbit has detected other AI code review bot(s) in this pull request and will avoid duplicating their findings in the review comments. This may lead to a less comprehensive review. WalkthroughAdds a new package Changes
Sequence Diagram(s)sequenceDiagram
participant Test as Test code
participant Fakectx as fakectx helpers
participant Context as context.Context
Note over Test,Fakectx: Acquire a test context
Test->>Fakectx: Cancelled() / DeadlineExceeded() / TimedOut() / TimesOutAfter(d) / CancelledWithCallback(cb)
Fakectx-->>Test: returns preconfigured Context (and CancelFunc when applicable)
alt CancelledWithCallback
Test->>Context: call CancelFunc()
Context->>Fakectx: trigger callback (sync.Once guard)
Fakectx-->>Test: Done closed, Err == context.Canceled
else Timeout/Deadline
Note over Context: immediate or future deadline set
Context-->>Test: Done closed when deadline reached, Err == context.DeadlineExceeded
end
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes
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Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
✨ Finishing touches
🧪 Generate unit tests (beta)
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🚧 Files skipped from review as they are similar to previous changes (1)
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #12 +/- ##
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Coverage 100.00% 100.00%
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Files 2 3 +1
Lines 102 127 +25
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+ Hits 102 127 +25
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Pull request overview
This PR introduces the fakes/fakectx package, providing pre-built context helpers for testing cancellation and deadline scenarios. The package simplifies test authoring by offering ready-made contexts in various states (cancelled, timed out, etc.) without requiring boilerplate setup code.
Key Changes:
- New
fakes/fakectxpackage with five helper functions:Cancelled(),DeadlineExceeded(),TimedOut(),TimesOutAfter(), andCancelledWithCallback() - Comprehensive test coverage and example tests demonstrating usage patterns
- Integration into build system and documentation
Reviewed changes
Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
fakes/fakectx/go.mod |
Defines the module path and Go version for the new package |
fakes/fakectx/fakectx.go |
Core implementation of context helper functions |
fakes/fakectx/fakectx_test.go |
Comprehensive unit tests covering all helper functions |
fakes/fakectx/fakectx_example_test.go |
Example tests demonstrating usage patterns |
fakes/fakectx/Makefile |
Build, test, and lint configuration for the package |
README.md |
Documentation updates including usage example and package table entry |
testlazy.go |
Removes "coming soon" notation for fakectx package |
Makefile |
Adds fakectx to the list of components for project-wide builds |
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Actionable comments posted: 0
🧹 Nitpick comments (1)
fakes/fakectx/fakectx_example_test.go (1)
43-45: Simplify the nil error check.The pattern
!errors.Is(ctx.Err(), nil)is unnecessarily convoluted for checking if an error is non-nil. A direct comparison improves readability.Apply this diff to simplify the check:
- if !errors.Is(ctx.Err(), nil) { + if ctx.Err() != nil { fmt.Println("Timeout too soon") }
📜 Review details
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Review profile: CHILL
Plan: Pro
📒 Files selected for processing (8)
Makefile(1 hunks)README.md(3 hunks)fakes/fakectx/Makefile(1 hunks)fakes/fakectx/fakectx.go(1 hunks)fakes/fakectx/fakectx_example_test.go(1 hunks)fakes/fakectx/fakectx_test.go(1 hunks)fakes/fakectx/go.mod(1 hunks)testlazy.go(1 hunks)
🧰 Additional context used
🧬 Code graph analysis (2)
fakes/fakectx/fakectx_example_test.go (1)
fakes/fakectx/fakectx.go (5)
Cancelled(20-25)DeadlineExceeded(30-35)TimedOut(39-44)TimesOutAfter(49-57)CancelledWithCallback(62-76)
fakes/fakectx/fakectx_test.go (1)
fakes/fakectx/fakectx.go (5)
Cancelled(20-25)DeadlineExceeded(30-35)TimedOut(39-44)TimesOutAfter(49-57)CancelledWithCallback(62-76)
🪛 checkmake (0.2.2)
fakes/fakectx/Makefile
[warning] 6-6: Target body for "tests" exceeds allowed length of 5 (6).
(maxbodylength)
[warning] 25-25: Target body for "format" exceeds allowed length of 5 (12).
(maxbodylength)
[warning] 40-40: Target body for "lint" exceeds allowed length of 5 (6).
(maxbodylength)
[warning] 1-1: Missing required phony target "test"
(minphony)
⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)
- GitHub Check: Agent
🔇 Additional comments (7)
testlazy.go (1)
11-11: LGTM! Documentation updated appropriately.The removal of "(coming soon)" correctly reflects that the
fakes/fakectxpackage is now available.README.md (1)
5-5: LGTM! Documentation clearly describes the new package.The README updates accurately document the
fakectxpackage with a clear example demonstrating context cancellation testing. The addition of "helpers" to the project description appropriately reflects the expanded scope.Also applies to: 97-109, 122-122
fakes/fakectx/Makefile (1)
1-57: LGTM! Well-structured Makefile with comprehensive CI targets.The Makefile provides all necessary targets (tests, build, format, lint, coverage, benchmarks) with appropriate tool availability checks and graceful fallbacks when optional tools are missing.
Makefile (1)
5-5: LGTM! Component integration looks correct.Adding
fakes/fakectxto the COMPONENTS list properly integrates the new package into project-wide test, build, format, and lint workflows.fakes/fakectx/fakectx_test.go (1)
11-259: LGTM! Comprehensive and well-structured tests.The test suite thoroughly validates all helper functions with appropriate coverage of:
- Error types and states (Canceled vs DeadlineExceeded)
- Done channel closure timing (immediate vs delayed)
- Deadline reporting (past vs future)
- Callback invocation and idempotency
- Standard library interface compatibility
Excellent use of parallel test execution and atomic operations for concurrency testing.
fakes/fakectx/fakectx.go (1)
20-76: LGTM! All context helper implementations are correct.The five helper functions provide clear, well-documented test utilities:
- Cancelled(): Correctly creates an immediately-cancelled context
- DeadlineExceeded(): Properly returns a context with a past deadline
- TimedOut(): Appropriately uses zero timeout with deferred cleanup
- TimesOutAfter(): The goroutine calling cancel() after timeout may seem redundant since the context auto-expires, but it follows Go's recommendation to call cancel() to release resources early
- CancelledWithCallback(): Excellent use of
sync.Onceto guarantee single callback execution with proper nil checkingThe implementations are clean, efficient, and well-suited for test scenarios.
fakes/fakectx/go.mod (1)
3-3: I need to verify whether Go 1.24.3 is a valid, released version specifically.Go 1.24.3 is a valid, released version—no changes needed.
Go 1.24.3 was released on May 6, 2025, and includes security fixes to the os package, as well as bug fixes to the runtime, the compiler, the linker, the go command, and the crypto/tls and os packages. While Go 1.25.4 (released November 5, 2025) is the latest stable release, using Go 1.24.3 is perfectly valid for module development. The go.mod version specifies the minimum supported Go version, not necessarily the latest.
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Added a go routine to ensure cancel is called to prevent resource leaks. Even timeouts need a tidy up!
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✅ Actions performedReview triggered.
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This pull request introduces a new package,
fakes/fakectx, which provides ready-madecontext.Contexthelpers for testing cancellation and deadline scenarios in Go. The package is fully documented, tested, and integrated into the build and documentation systems. It allows test authors to easily simulate various context states (like canceled or timed out) without boilerplate code.Key changes:
New package:
fakes/fakectxfakes/fakectxpackage, which provides helpers such asCancelled,DeadlineExceeded,TimedOut,TimesOutAfter, andCancelledWithCallbackfor generating contexts in specific states for testing purposes. These helpers simplify writing tests that need to trigger cancelation or deadline logic.fakectx_test.go) and example usage (fakectx_example_test.go) to ensure correctness and demonstrate usage patterns. [1] [2]Makefilefor the new package to support building, testing, linting, formatting, and benchmarking.go.modfile for the new package, specifying module path and Go version.Documentation and build integration
README.mdto document the newfakes/fakectxpackage, including a usage example and a new entry in the package structure table. [1] [2] [3]fakes/fakectxto the rootMakefileso its tests and builds are included in project-wide commands.testlazy.goto remove the "coming soon" note forfakes/fakectx, reflecting its availability.Summary by CodeRabbit
New Features
Documentation
Tests
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