SyslogAppenderCustomLayoutTest is unreliable

[garydgregory]

Description

SyslogAppenderCustomLayoutTest is unreliable

[ERROR] Failures:
[ERROR]   SyslogAppenderCustomLayoutTest>SyslogAppenderTest.testTCPAppender:56->SyslogAppenderTestBase.sendAndCheckLegacyBsdMessage:74->SyslogAppenderTestBase.checkTheNumberOfSentAndReceivedMessages:112 The number of received messages should be equal with the number of sent messages expected:<1> but was:<0>
[ERROR]   SyslogAppenderCustomLayoutTest>SyslogAppenderTest.testUDPAppender:79->SyslogAppenderTestBase.sendAndCheckLegacyBsdMessage:74->SyslogAppenderTestBase.checkTheNumberOfSentAndReceivedMessages:112 The number of received messages should be equal with the number of sent messages expected:<1> but was:<0>

Configuration

Version: 2.x at 01125b1

Operating system:
Microsoft Windows [Version 10.0.19045.4780

JDK:
Apache Maven 3.9.9 (8e8579a9e76f7d015ee5ec7bfcdc97d260186937)
Maven home: C:\java\apache-maven-3.9.9
Java version: 17.0.12, vendor: Eclipse Adoptium, runtime: C:\Program Files\Eclipse Adoptium\jdk-17.0.12.7-hotspot
Default locale: en_US, platform encoding: UTF-8
OS name: "windows 10", version: "10.0", arch: "amd64", family: "windows"

Logs

[ERROR] Tests run: 5, Failures: 2, Errors: 0, Skipped: 0, Time elapsed: 3.549 s <<< FAILURE! -- in org.apache.logging.log4j.core.appender.SyslogAppenderCustomLayoutTest
[INFO] Running org.apache.logging.log4j.core.appender.SmtpAppenderAsyncTest
10:07:11.688 main ERROR The pattern, literal, and isEventTimestamp attributes are mutually exclusive.
[ERROR] org.apache.logging.log4j.core.appender.SyslogAppenderCustomLayoutTest.testTCPAppender -- Time elapsed: 0.225 s <<< FAILURE!
java.lang.AssertionError: The number of received messages should be equal with the number of sent messages expected:<1> but was:<0>
        at org.apache.logging.log4j.core.appender.SyslogAppenderTestBase.checkTheNumberOfSentAndReceivedMessages(SyslogAppenderTestBase.java:112)
        at org.apache.logging.log4j.core.appender.SyslogAppenderTestBase.sendAndCheckLegacyBsdMessage(SyslogAppenderTestBase.java:74)
        at org.apache.logging.log4j.core.appender.SyslogAppenderTest.testTCPAppender(SyslogAppenderTest.java:56)
        at java.base/java.lang.reflect.Method.invoke(Method.java:569)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)

[ERROR] org.apache.logging.log4j.core.appender.SyslogAppenderCustomLayoutTest.testUDPAppender -- Time elapsed: 0.209 s <<< FAILURE!
java.lang.AssertionError: The number of received messages should be equal with the number of sent messages expected:<1> but was:<0>
        at org.apache.logging.log4j.core.appender.SyslogAppenderTestBase.checkTheNumberOfSentAndReceivedMessages(SyslogAppenderTestBase.java:112)
        at org.apache.logging.log4j.core.appender.SyslogAppenderTestBase.sendAndCheckLegacyBsdMessage(SyslogAppenderTestBase.java:74)
        at org.apache.logging.log4j.core.appender.SyslogAppenderTest.testUDPAppender(SyslogAppenderTest.java:79)
        at java.base/java.lang.reflect.Method.invoke(Method.java:569)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)

Reproduction

mvn clean install

[garydgregory]

Just FYI, still an issue with the latest from 2.x:

git log -1
commit b55c4d3fa2489cf91d6569aac57b05ae2c9d4b06 (HEAD -> 2.x, origin/2.x)