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Fixing Flaky Test. Changes in CachingDateFormatter.java file. #742

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Fixing Flaky Test. Changes in CachingDateFormatter.java file. #742

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@njain2208 njain2208 commented Nov 28, 2023 •
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PR Overview:

This PR fixes the flaky/non-deterministic behavior of the following test because it assumes the zone in the DateTimeFormatter.

ch.qos.logback.core.rolling.helper.SizeAndTimeBasedArchiveRemoverTest

Test Overview:

The test above uses the SizeAndTimeBasedArchiveRemover object, which uses the descendingSort method, this method makes an internal call to the Format method in the CachingDateFormatter.java file where the problem lies.

You can reproduce the issue by running the following commands:

mvn install -pl logback-core -am -DskipTests
mvn test -pl logback-core -Dtest=ch.qos.logback.core.rolling.helper.SizeAndTimeBasedArchiveRemoverTest
mvn -pl logback-core edu.illinois:nondex-maven-plugin:2.1.1:nondex -Dtest=ch.qos.logback.core.rolling.helper.SizeAndTimeBasedArchiveRemoverTest

Within the format class, the zone is initially set to null. However, when I ran the rest on the nondex tool software it introduced variability in the test seed, causing the zone to deviate from UTC. Consequently, the date value shifts from "smoke-1970-01-01-1.gz" to "smoke-1969-12-31-(\d+).gz," resulting in test failures.
This flakiness was identified by the nondex tool created by the researchers of UIUC.

Fix:

To fix the issue I decided to explicitly set the zone to UTC to DateTimeFormatter in the format() method in the CachingDateFormatter.java file.

https://github.com/njain2208/logback/blob/5cc0d2faa62443b14272485822aace48a765b824/logback-core/src/main/java/ch/qos/logback/core/util/CachingDateFormatter.java#L71-L78

Failures:

Nondex error:

[INFO] -------------------------------------------------------
[INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO] Running ch.qos.logback.core.rolling.helper.SizeAndTimeBasedArchiveRemoverTest
smoke-1969-12-31-(\d+).gz
smoke-1969-12-31-(\d+).gz
[ERROR] Tests run: 2, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.261 s <<< FAILURE! - in ch.qos.logback.core.rolling.helper.SizeAndTimeBasedArchiveRemoverTest
[ERROR] ch.qos.logback.core.rolling.helper.SizeAndTimeBasedArchiveRemoverTest.badFilenames  Time elapsed: 0.181 s
[ERROR] ch.qos.logback.core.rolling.helper.SizeAndTimeBasedArchiveRemoverTest.smoke  Time elapsed: 0.01 s  <<< FAILURE!
org.opentest4j.AssertionFailedError: array contents differ at index [0], expected: </tmp/smoke-1970-01-01-1.gz> but was: </tmp/smoke-1970-01-01-0.gz>
        at org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
        at org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)
        at org.junit.jupiter.api.AssertArrayEquals.failArraysNotEqual(AssertArrayEquals.java:440)
        at org.junit.jupiter.api.AssertArrayEquals.assertArrayElementsEqual(AssertArrayEquals.java:389)
        at org.junit.jupiter.api.AssertArrayEquals.assertArrayEquals(AssertArrayEquals.java:346)
        at org.junit.jupiter.api.AssertArrayEquals.assertArrayEquals(AssertArrayEquals.java:159)
        at org.junit.jupiter.api.AssertArrayEquals.assertArrayEquals(AssertArrayEquals.java:155)
        at org.junit.jupiter.api.Assertions.assertArrayEquals(Assertions.java:1453)
        at [email protected]/ch.qos.logback.core.rolling.helper.SizeAndTimeBasedArchiveRemoverTest.smoke(SizeAndTimeBasedArchiveRemoverTest.java:31)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:727)
        at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
        at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
        at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:156)
        at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:147)
        at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:86)
        at org.junit.jupiter.engine.execution.InterceptingExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(InterceptingExecutableInvoker.java:103)
        at org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.lambda$invoke$0(InterceptingExecutableInvoker.java:93)
        at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
        at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
        at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
        at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
        at org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.invoke(InterceptingExecutableInvoker.java:92)
        at org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.invoke(InterceptingExecutableInvoker.java:86)
        at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$7(TestMethodTestDescriptor.java:217)
        at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:213)
        at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:138)
        at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:68)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:151)
        at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
        at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
        at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
        at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)
        at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
        at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
        at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
        at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)
        at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
        at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
        at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
        at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
        at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:35)
        at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
        at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:54)
        at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:147)
        at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:127)
        at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:90)
        at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:55)
        at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:102)
        at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:54)
        at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:114)
        at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:86)
        at org.junit.platform.launcher.core.DefaultLauncherSession$DelegatingLauncher.execute(DefaultLauncherSession.java:86)
        at org.apache.maven.surefire.junitplatform.LazyLauncher.execute(LazyLauncher.java:55)
        at org.apache.maven.surefire.junitplatform.JUnitPlatformProvider.execute(JUnitPlatformProvider.java:223)
        at org.apache.maven.surefire.junitplatform.JUnitPlatformProvider.invokeAllTests(JUnitPlatformProvider.java:175)
        at org.apache.maven.surefire.junitplatform.JUnitPlatformProvider.invoke(JUnitPlatformProvider.java:139)
        at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:456)
        at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:169)
        at org.apache.maven.surefire.booter.ForkedBooter.run(ForkedBooter.java:595)
        at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:581)

[INFO] 
[INFO] Results:
[INFO] 
[ERROR] Failures: 
[ERROR]   SizeAndTimeBasedArchiveRemoverTest.smoke:31 array contents differ at index [0], expected: </tmp/smoke-1970-01-01-1.gz> but was: </tmp/smoke-1970-01-01-0.gz>
[INFO] 
[ERROR] Tests run: 2, Failures: 1, Errors: 0, Skipped: 0
[INFO]

@njain2208
Update CachingDateFormatter.java
5cc0d2f 
Fixed the flaky test.
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