[backport camel-4.22.x] CAMEL-24957: Fix flaky test MessageHistoryExceptionRouteTest

[oscerd]

Backport of #26855

Cherry-pick of #26855 onto camel-4.22.x.

Original PR: #26855 - CAMEL-24957: Fix flaky test MessageHistoryExceptionRouteTest
Original author: @tmielke
Target branch: camel-4.22.x

Why it is needed on 4.22.x

On camel-4.22.x, PR CI tests every module that depends on a changed core module. So a core backport runs camel-opentelemetry-metrics, and there MessageHistoryExceptionRouteTest.testMetricsHistory fails all three surefire attempts:

• first expected: <5> but was: <4>
• then ConditionTimeout on both reruns

These are exactly the two failure modes #26855 fixed on main. It currently blocks #26895, the 4.22.x backport of CAMEL-24973 (run 36427587057), and will block any other core backport to this branch.

#26855 was rebase-merged, so it is two commits on main: 36503c92 and d9e938af. Both are cherry-picked here. Both applied cleanly, and together their diff is identical to #26855's. It is test code only, in AbstractOpenTelemetryTestSupport, MessageHistoryExceptionRouteTest and MessageHistoryTest.

Verified on camel-4.22.x:

• full reactor mvn clean install -DskipTests -DskipITs: green
• camel-opentelemetry-metrics module tests: 89 unit tests and 5 ITs green, MessageHistoryExceptionRouteTest and MessageHistoryTest included

Original description

Fixes two distinct failure modes in MessageHistoryExceptionRouteTest.testMetricsHistory().

Failure 1 — Race condition (expected: <5> but was: <4>):
Metric recording via nodeProcessingDone() happens asynchronously on seda threads. MockEndpoint.assertIsSatisfied() only waits for mock endpoints to receive messages, not for metrics to be flushed. The bare assertEquals() calls could run before all nodeProcessingDone() callbacks had fired. Fix: wrap all metric count assertions in a single await().untilAsserted() block.

Failure 2 — Cleanup failure on rerun (ConditionTimeoutException):
CamelOpenTelemetryExtension implements BeforeEachCallback and AfterEachCallback, but the otelExtension field in AbstractOpenTelemetryTestSupport was missing @RegisterExtension, so JUnit never invoked those lifecycle methods. On a test retry in the same JVM the SDK was neither reset nor reinitialized, causing metrics to be undetectable. Fix: add @RegisterExtension to otelExtension in AbstractOpenTelemetryTestSupport.

Claude Code on behalf of @oscerd

🤖 Generated with Claude Code

[gnodet-bot]

The two changes included here are correct: @RegisterExtension was indeed missing, and wrapping all metric assertions in await().untilAsserted() properly fixes the race. Both hunks are identical to the original #26855.

However, the cherry-pick is incomplete. The original PR #26855 fixed 3 files, but this backport only includes 2 — MessageHistoryTest.java is missing. That test has the exact same race pattern (bare assertEquals() after MockEndpoint.assertIsSatisfied() on async seda-thread metrics) and will flake on camel-4.22.x for the same reason.

This review was generated by an AI agent, Hermès on behalf of @gnodet.

[davsclaus]

Thanks for the backport. It is missing one of the three files from #26855. On main, the fix also wraps the metric assertions of MessageHistoryTest in await().untilAsserted(...):

// Metric recording via nodeProcessingDone() happens asynchronously on seda threads,
// so all metric assertions need to be wrapped in await() to avoid a race with mock receipt.
await().atMost(5, TimeUnit.SECONDS).untilAsserted(() -> {
    // there should be 3 names
    assertEquals(3, getAllPointData(DEFAULT_CAMEL_MESSAGE_HISTORY_METER_NAME).size());
    assertEquals(count / 2, getPointData("route1", "foo").getCount());
    assertEquals(count / 2, getPointData("route2", "bar").getCount());
    assertEquals(count / 2, getPointData("route2", "baz").getCount());
});

On camel-4.22.x that test still asserts right after MockEndpoint.assertIsSatisfied(context), which is the same race that made MessageHistoryExceptionRouteTest fail on #26895. Could you add it, so the backport matches #26855?

Claude Code on behalf of davsclaus

[github-actions]

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[gnodet-bot]

Re-review after new commits: the previous finding (incomplete cherry-pick — MessageHistoryTest.java was missing) is now addressed. The backport includes all 3 files from #26855 with identical diffs. Clean test-only backport, no issues.

This review was generated by an AI agent, Hermès on behalf of @gnodet.

[github-actions]

🧪 CI tested the following changed modules:

• components/camel-opentelemetry-metrics

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🔬 Scalpel shadow comparison — Scalpel: 1 tested, 0 compile-only — current: 9 all tested

Maveniverse Scalpel detected 1 affected modules (current approach: 9).

Modules only in current approach (8)

• camel-jbang-mcp
• camel-jbang-plugin-mcp
• camel-jbang-plugin-route-parser
• camel-jbang-plugin-tui
• camel-jbang-plugin-validate
• camel-launcher-container
• camel-yaml-dsl-validator
• camel-yaml-dsl-validator-maven-plugin

Skip-tests mode would test 1 modules (1 direct + 0 downstream), skip tests for 0 (generated code, meta-modules)

Modules Scalpel would test (1)

• camel-opentelemetry-metrics

ℹ️ Shadow mode — Scalpel observes but does not affect test execution. Learn more

All tested modules (9 modules)

• Camel :: JBang :: MCP
• Camel :: JBang :: Plugin :: MCP
• Camel :: JBang :: Plugin :: Route Parser
• Camel :: JBang :: Plugin :: TUI
• Camel :: JBang :: Plugin :: Validate
• Camel :: Launcher :: Container
• Camel :: Opentelemetry Metrics
• Camel :: YAML DSL :: Validator
• Camel :: YAML DSL :: Validator Maven Plugin

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