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Posted to commits@camel.apache.org by "gnodet (via GitHub)" <gi...@apache.org> on 2026/07/06 08:26:24 UTC
[PR] CAMEL-23918: Fix flaky tests in camel-reactive-streams [camel]
gnodet opened a new pull request, #24448:
URL: https://github.com/apache/camel/pull/24448
## Summary
Replace `Thread.sleep` calls with Awaitility-based assertions and Camel-idiomatic alternatives across 5 test classes in `camel-reactive-streams`:
- **DelayedMonoPublisherTest** (5 sleeps): Use `ScheduledExecutorService.schedule()` for delayed actions and Awaitility `await().until()` for condition-based waiting
- **BackpressureStrategyTest** (6 sleeps): Use `AtomicInteger` counter with Awaitility to reliably wait for timer events, replacing fixed sleep durations
- **BackpressureSubscriberTest** (3 sleeps): Replace `Thread.sleep` in route processors with Camel's `delay()` EIP for simulating processing time
- **BackpressurePublisherRoutePolicyTest** (2 sleeps): Use Awaitility `untilAsserted()` to wait for route policy state changes
- **BasicPublisherTest** (1 sleep): Remove unnecessary sleep between dispose/subscribe
Also adds the Awaitility test dependency to the module's `pom.xml`.
## Test plan
- [x] All 65 tests in `camel-reactive-streams` pass locally
- [x] No remaining `Thread.sleep` calls in the 5 affected test files
- [ ] CI build passes
_Claude Code on behalf of Guillaume Nodet_
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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Re: [PR] CAMEL-23918: Fix flaky tests in camel-reactive-streams [camel]
Posted by "gnodet (via GitHub)" <gi...@apache.org>.
gnodet commented on PR #24448:
URL: https://github.com/apache/camel/pull/24448#issuecomment-4891528912
_Claude Code on behalf of Guillaume Nodet_
Closing — this fix was not validated by running the test 100 times first. Will re-dispatch with a validation-first approach: run the test 100x, and only create a JIRA + fix if it actually fails.
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Re: [PR] CAMEL-23918: Fix flaky tests in camel-reactive-streams [camel]
Posted by "gnodet (via GitHub)" <gi...@apache.org>.
gnodet commented on PR #24448:
URL: https://github.com/apache/camel/pull/24448#issuecomment-4891201878
_Claude Code on behalf of Guillaume Nodet_
📋 **Process note**: Before undrafting, the test(s) modified in this PR should be run 100 times (e.g. with `mvn test -Dsurefire.rerunFailingTestsCount=0 -Dtest=<TestClass> -pl <module> -Dsurefire.runCount=100`) to confirm they are actually flaky. If they pass 100/100 without the fix, the change may not be needed.
Also ensure:
- MockEndpoint helpers (`assertIsSatisfied()` already waits 10s, `setResultWaitTime()`, `setAssertPeriod()`) are used where appropriate instead of Awaitility wrappers
- Valid `Thread.sleep()` calls (UDP pacing, simulation delays, "wait to confirm nothing happens") are preserved
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Re: [PR] CAMEL-23918: Fix flaky tests in camel-reactive-streams [camel]
Posted by "apupier (via GitHub)" <gi...@apache.org>.
apupier commented on code in PR #24448:
URL: https://github.com/apache/camel/pull/24448#discussion_r3527479761
##########
components/camel-reactive-streams/src/test/java/org/apache/camel/component/reactive/streams/BackpressureStrategyTest.java:
##########
@@ -145,12 +155,14 @@ public void onNext(Integer o) {
context().start();
assertTrue(latch.await(5, TimeUnit.SECONDS));
- Thread.sleep(1000); // wait for all numbers to be generated
+ // Wait for all 20 timer events to be processed
+ await().atMost(5, TimeUnit.SECONDS).until(() -> timerCount.get() >= 20);
subscriber.request(19);
- assertTrue(latch2.await(1, TimeUnit.SECONDS));
- Thread.sleep(200); // add other time to ensure no other items arrive
- assertEquals(2, queue.size());
+ assertTrue(latch2.await(2, TimeUnit.SECONDS));
+ // Verify exactly 2 items received and no more arrive
+ await().atMost(2, TimeUnit.SECONDS)
+ .untilAsserted(() -> assertEquals(2, queue.size()));
Review Comment:
this is no more waiting for potential new messages erroneously to arrive
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Re: [PR] CAMEL-23918: Fix flaky tests in camel-reactive-streams [camel]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #24448:
URL: https://github.com/apache/camel/pull/24448#issuecomment-4891230124
<!-- ci-tested-modules -->
:test_tube: **CI tested the following changed modules:**
- `components/camel-reactive-streams`
---
<details><summary>:microscope: Scalpel shadow comparison — Scalpel: 11 tested, 29 compile-only — current: 11 all tested</summary>
[Maveniverse Scalpel](https://github.com/maveniverse/scalpel) detected **40 affected modules** (current approach: 11).
<details><summary>:warning: Modules only in Scalpel (29)</summary>
- `apache-camel`
- `camel-allcomponents`
- `camel-catalog`
- `camel-catalog-console`
- `camel-catalog-lucene`
- `camel-catalog-maven`
- `camel-catalog-suggest`
- `camel-componentdsl`
- `camel-csimple-maven-plugin`
- `camel-endpointdsl`
- `camel-endpointdsl-support`
- `camel-itest`
- `camel-jbang-core`
- `camel-jbang-it`
- `camel-jbang-main`
- `camel-jbang-plugin-edit`
- `camel-jbang-plugin-generate`
- `camel-jbang-plugin-kubernetes`
- `camel-jbang-plugin-test`
- `camel-kamelet-main`
- `camel-launcher`
- `camel-report-maven-plugin`
- `camel-route-parser`
- `camel-yaml-dsl`
- `camel-yaml-dsl-deserializers`
- `camel-yaml-dsl-maven-plugin`
- `coverage`
- `docs`
- `dummy-component`
</details>
**Skip-tests mode would test 11 modules** (1 direct + 10 downstream), **skip tests for 29** (generated code, meta-modules)
<details><summary>Modules Scalpel would test (11)</summary>
- `camel-jbang-mcp`
- `camel-jbang-plugin-mcp`
- `camel-jbang-plugin-route-parser`
- `camel-jbang-plugin-tui`
- `camel-jbang-plugin-validate`
- `camel-launcher-container`
- `camel-reactive-streams`
- `camel-reactor`
- `camel-rxjava`
- `camel-yaml-dsl-validator`
- `camel-yaml-dsl-validator-maven-plugin`
</details>
<details><summary>Modules with tests skipped (29)</summary>
- `apache-camel`
- `camel-allcomponents`
- `camel-catalog`
- `camel-catalog-console`
- `camel-catalog-lucene`
- `camel-catalog-maven`
- `camel-catalog-suggest`
- `camel-componentdsl`
- `camel-csimple-maven-plugin`
- `camel-endpointdsl`
- `camel-endpointdsl-support`
- `camel-itest`
- `camel-jbang-core`
- `camel-jbang-it`
- `camel-jbang-main`
- `camel-jbang-plugin-edit`
- `camel-jbang-plugin-generate`
- `camel-jbang-plugin-kubernetes`
- `camel-jbang-plugin-test`
- `camel-kamelet-main`
- `camel-launcher`
- `camel-report-maven-plugin`
- `camel-route-parser`
- `camel-yaml-dsl`
- `camel-yaml-dsl-deserializers`
- `camel-yaml-dsl-maven-plugin`
- `coverage`
- `docs`
- `dummy-component`
</details>
> :information_source: Shadow mode — Scalpel observes but does not affect test execution. [Learn more](https://github.com/maveniverse/scalpel)
</details>
<details><summary>All tested modules (40 modules)</summary>
- Camel :: All Components Sync point
- Camel :: Assembly
- Camel :: Catalog :: CSimple Maven Plugin (deprecated)
- Camel :: Catalog :: Camel Catalog
- Camel :: Catalog :: Camel Report Maven Plugin
- Camel :: Catalog :: Camel Route Parser
- Camel :: Catalog :: Console
- Camel :: Catalog :: Dummy Component
- Camel :: Catalog :: Lucene (deprecated)
- Camel :: Catalog :: Maven
- Camel :: Catalog :: Suggest
- Camel :: Component DSL
- Camel :: Coverage
- Camel :: Docs
- Camel :: Endpoint DSL
- Camel :: Endpoint DSL :: Support
- Camel :: Integration Tests
- Camel :: JBang :: Core
- Camel :: JBang :: Integration tests
- Camel :: JBang :: MCP
- Camel :: JBang :: Main
- Camel :: JBang :: Plugin :: Edit
- Camel :: JBang :: Plugin :: Generate
- Camel :: JBang :: Plugin :: Kubernetes
- Camel :: JBang :: Plugin :: MCP
- Camel :: JBang :: Plugin :: Route Parser
- Camel :: JBang :: Plugin :: TUI
- Camel :: JBang :: Plugin :: Testing
- Camel :: JBang :: Plugin :: Validate
- Camel :: Kamelet Main
- Camel :: Launcher
- Camel :: Launcher :: Container
- Camel :: Reactive Streams
- Camel :: Reactor
- Camel :: RxJava
- Camel :: YAML DSL
- Camel :: YAML DSL :: Deserializers
- Camel :: YAML DSL :: Maven Plugins
- Camel :: YAML DSL :: Validator
- Camel :: YAML DSL :: Validator Maven Plugin
</details>
---
:gear: [View full build and test results](https://github.com/apache/camel/actions/runs/28778153939)
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Re: [PR] CAMEL-23918: Fix flaky tests in camel-reactive-streams [camel]
Posted by "gnodet (via GitHub)" <gi...@apache.org>.
gnodet commented on PR #24448:
URL: https://github.com/apache/camel/pull/24448#issuecomment-4891952537
@copilot review
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Re: [PR] CAMEL-23918: Fix flaky tests in camel-reactive-streams [camel]
Posted by "gnodet (via GitHub)" <gi...@apache.org>.
gnodet closed pull request #24448: CAMEL-23918: Fix flaky tests in camel-reactive-streams
URL: https://github.com/apache/camel/pull/24448
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Re: [PR] CAMEL-23918: Fix flaky tests in camel-reactive-streams [camel]
Posted by "gnodet (via GitHub)" <gi...@apache.org>.
gnodet commented on PR #24448:
URL: https://github.com/apache/camel/pull/24448#issuecomment-4891010367
@copilot review
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Re: [PR] CAMEL-23918: Fix flaky tests in camel-reactive-streams [camel]
Posted by "davsclaus (via GitHub)" <gi...@apache.org>.
davsclaus merged PR #24448:
URL: https://github.com/apache/camel/pull/24448
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Re: [PR] CAMEL-23918: Fix flaky tests in camel-reactive-streams [camel]
Posted by "gnodet (via GitHub)" <gi...@apache.org>.
gnodet commented on PR #24448:
URL: https://github.com/apache/camel/pull/24448#issuecomment-4891898469
### Third commit: Fix race condition in BackpressureStrategyTest
Investigation revealed a pre-existing race condition in `BackpressureStrategyTest` that caused the exact-sum assertions to fail non-deterministically (even without `Thread.sleep`).
**Root cause**: `CamelSubscription.checkAndFlush()` schedules the flush asynchronously on a worker pool thread. With the timer firing every 20ms, the next item can arrive and modify the buffer (via the backpressure strategy) before the flush actually runs:
- **OLDEST**: Item 1 enters buffer → Item 2 arrives before flush → OLDEST discards item 2 (keeps oldest) → flush delivers item 1 → item 3 becomes the new oldest → result: [1, 3] sum=4 instead of [1, 2] sum=3
- **LATEST**: Item 1 enters buffer → Item 2 arrives before flush → LATEST replaces item 1 with item 2 → flush delivers item 2 → item 20 ends up as latest → result: [2, 20] sum=22 instead of [1, 20] sum=21
**Fix**: Replace fragile exact-sum assertions with invariant-based assertions that verify the actual backpressure strategy behavior:
- **OLDEST**: first item is always 1 (oldest kept in buffer), second item is an early value (>1, <20)
- **LATEST**: second item is always 20 (most recent always kept by LATEST strategy)
_Claude Code on behalf of Guillaume Nodet_
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Re: [PR] CAMEL-23918: Fix flaky tests in camel-reactive-streams [camel]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #24448:
URL: https://github.com/apache/camel/pull/24448#issuecomment-4890817903
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Re: [PR] CAMEL-23918: Fix flaky tests in camel-reactive-streams [camel]
Posted by "gnodet (via GitHub)" <gi...@apache.org>.
gnodet commented on code in PR #24448:
URL: https://github.com/apache/camel/pull/24448#discussion_r3527658886
##########
components/camel-reactive-streams/src/test/java/org/apache/camel/component/reactive/streams/BackpressureStrategyTest.java:
##########
@@ -145,12 +155,14 @@ public void onNext(Integer o) {
context().start();
assertTrue(latch.await(5, TimeUnit.SECONDS));
- Thread.sleep(1000); // wait for all numbers to be generated
+ // Wait for all 20 timer events to be processed
+ await().atMost(5, TimeUnit.SECONDS).until(() -> timerCount.get() >= 20);
subscriber.request(19);
- assertTrue(latch2.await(1, TimeUnit.SECONDS));
- Thread.sleep(200); // add other time to ensure no other items arrive
- assertEquals(2, queue.size());
+ assertTrue(latch2.await(2, TimeUnit.SECONDS));
+ // Verify exactly 2 items received and no more arrive
+ await().atMost(2, TimeUnit.SECONDS)
+ .untilAsserted(() -> assertEquals(2, queue.size()));
Review Comment:
Good catch! Fixed in 2b503ed — replaced `await().untilAsserted()` with `await().during(500ms).until(() -> queue.size() == 2)` which verifies that the queue size remains stable at 2 for 500ms, ensuring no extra items erroneously arrive.
_Claude Code on behalf of Guillaume Nodet_
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