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fix(provider-tck): review findings, and stop shipping a second ObjectFactory - #1942
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Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 31.25% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 5 files. (1 skipped: … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Title check The title clearly identifies the provider TCK fixes and the removal of the extra Cucumber ObjectFactory dependency. Description check The description directly explains the changed dependencies, lifecycle fixes, URL encoding behavior, tests, and verification results.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 31.25% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 5 files. (1 skipped: 1 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 1
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at
@tools/tck/src/main/java/dev/openfeature/contrib/tools/tck/internal/steps/TckLifecycle.java:
- Around line 89-98: Make startForExecutingSuite() synchronized so the cached
startFailure check and harness startup execute atomically across concurrent
suite-start callers, preserving the first failure and preventing duplicate
startup attempts.
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📒 Files selected for processing: 6
tools/tck/pom.xmltools/tck/src/main/java/dev/openfeature/contrib/tools/tck/ContainerizedProviderTckTest.javatools/tck/src/main/java/dev/openfeature/contrib/tools/tck/HttpBackendControl.javatools/tck/src/main/java/dev/openfeature/contrib/tools/tck/internal/steps/TckLifecycle.javatools/tck/src/test/java/dev/openfeature/contrib/tools/tck/HttpBackendControlTest.javatools/tck/src/test/java/dev/openfeature/contrib/tools/tck/internal/steps/TckLifecycleTest.java
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Oct 20, 2026
The cached failure was a plain volatile, so two threads failing to start their own backend could each write it and the adopter saw whichever landed last. It is an AtomicReference set with compareAndSet, so the first failure is the one reported. Not synchronized beyond that, on purpose: making a second thread wait for the first thread's Compose startup is the serialisation per-thread backends exist to avoid. Threads that race before a failure is cached each pay one attempt, in parallel, and everyone arriving after it fails fast. Raised by CodeRabbit on #1942, which asked for the whole check-and-start to be synchronized; that half would have undone the parallel design. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
- jackson-databind 2.22.1 to 2.22.3. The TCK exposes it at compile scope so adopters inherit it, and tools/flagd-api-testkit already pins 2.22.3 -- the suite was behind its own repo. - A Compose stack that threw from start() leaked its containers: startCompose() had not returned into the field stopSuite() reads. It stops the stack before rethrowing. - POST /start sent config=null for the configuration overHttp() documents as nullable, and concatenated the name unencoded, so a space made URI.create throw. The query is omitted when there is no configuration and URL-encoded otherwise. - TckLifecycle.start() rethrew after stopSuite(), so a teardown failure replaced the reason the suite would not start. It is suppressed onto the original instead. - A failed start was not recorded, so every later scenario retried it: for a containerized suite, one Compose timeout per scenario. It is cached for the suite and cleared in beginSuite() and endSuite(). The last two are in code added late in #1830 and had no review pass before it merged. Found by CodeRabbit on #1830. 257 tests, three of them new. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
TckObjectFactory needs org.picocontainer's container, which the TCK was getting transitively through io.cucumber:cucumber-picocontainer. That artifact also registers Cucumber's own PicoFactory through META-INF/services, so an adopter inherited two ObjectFactory services and Cucumber refused to choose between them in the adopter's own Cucumber suites. That is how flagd's ConfigCucumberTest failed as soon as it rebased onto a base that ships the TCK. Depending on org.picocontainer:picocontainer directly leaves only the TCK's own factory on an adopter's classpath. dependency:tree confirms it: picocontainer 2.15.2 at compile scope, cucumber-picocontainer absent. Inside this repository the root pom hands every module cucumber-picocontainer at test scope, so the adoptions here still see both factories and still name the one they want. This is about what the published artifact imposes on everyone else. 257 tests, unchanged. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
The cached failure was a plain volatile, so two threads failing to start their own backend could each write it and the adopter saw whichever landed last. It is an AtomicReference set with compareAndSet, so the first failure is the one reported. Not synchronized beyond that, on purpose: making a second thread wait for the first thread's Compose startup is the serialisation per-thread backends exist to avoid. Threads that race before a failure is cached each pay one attempt, in parallel, and everyone arriving after it fails fast. Raised by CodeRabbit on #1942, which asked for the whole check-and-start to be synchronized; that half would have undone the parallel design. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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The five CodeRabbit findings on #1830 that merged before they were addressed. Each one verified against the code rather than taken on the review's word.
jackson-databind2.22.1 → 2.22.3tools/flagd-api-testkitalready pins 2.22.3, so the suite was behind its own repostartCompose()callsstack.start()before returning into the fieldstopSuite()reads, so a startup failure left nothing to stop. It stops the stack before rethrowingPOST /start?config=nullBackendControl.overHttp(..)documents the configuration as nullable, andstart()concatenated it unencoded — a name with a space madeURI.createthrow. The query is omitted when there is none, and URL-encoded otherwiseTckLifecycle.start()rethrew afterstopSuite(), so if teardown also failed the adopter never saw why the suite would not start. The cleanup failure is suppressed onto the originalbeginSuite()/endSuite()The last two are in code added late in #1830, so they had no review pass before the merge.
And one the review did not find
Adopting the TCK put two Cucumber
ObjectFactoryservices on the adopter's classpath, so Cucumberrefused to choose and their own Cucumber suites failed with "More than one Cucumber ObjectFactory was
found on the classpath". That is how #1847 went red the moment it rebased onto a base shipping the TCK.
TckObjectFactoryneedsorg.picocontainer's container, which the TCK was getting transitivelythrough
io.cucumber:cucumber-picocontainer-- an artifact that also registers Cucumber's ownPicoFactorythroughMETA-INF/services. Depending onorg.picocontainer:picocontainerdirectlyleaves only the TCK's factory registered.
dependency:treeconfirms it:picocontainer 2.15.2atcompile scope,
cucumber-picocontainerabsent.Inside this repository the root pom hands every module
cucumber-picocontainerat test scope, so theadoptions here still see both and still name the one they want; this is about what the published
artifact imposes on everyone else.
Verification
mvn -pl tools/tck test javadoc:javadoc— 257 tests, 0 failures, three of them new:/startwith no queryconfig=two+words)The two I could not test cheaply are the jackson bump and the Compose rollback — the latter needs a Docker start that fails on demand.