HDFS-16916. Improve the use of JUnit Test in DFSClient

[zhtttylz]

JIRA:HDFS-16916. Improve the use of JUnit Test in DFSClient

[slfan1989]

LGTM.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 41s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	detsecrets	0m 1s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	47m 20s		trunk passed
+1 💚	compile	1m 2s		trunk passed with JDK Ubuntu-11.0.17+8-post-Ubuntu-1ubuntu220.04
+1 💚	compile	0m 54s		trunk passed with JDK Private Build-1.8.0_352-8u352-ga-1~20.04-b08
+1 💚	checkstyle	0m 36s		trunk passed
+1 💚	mvnsite	0m 59s		trunk passed
+1 💚	javadoc	0m 52s		trunk passed with JDK Ubuntu-11.0.17+8-post-Ubuntu-1ubuntu220.04
+1 💚	javadoc	0m 40s		trunk passed with JDK Private Build-1.8.0_352-8u352-ga-1~20.04-b08
+1 💚	spotbugs	2m 41s		trunk passed
+1 💚	shadedclient	24m 59s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 57s		the patch passed
+1 💚	compile	0m 52s		the patch passed with JDK Ubuntu-11.0.17+8-post-Ubuntu-1ubuntu220.04
+1 💚	javac	0m 52s		the patch passed
+1 💚	compile	0m 45s		the patch passed with JDK Private Build-1.8.0_352-8u352-ga-1~20.04-b08
+1 💚	javac	0m 45s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 20s		the patch passed
+1 💚	mvnsite	0m 50s		the patch passed
+1 💚	javadoc	0m 33s		the patch passed with JDK Ubuntu-11.0.17+8-post-Ubuntu-1ubuntu220.04
+1 💚	javadoc	0m 33s		the patch passed with JDK Private Build-1.8.0_352-8u352-ga-1~20.04-b08
+1 💚	spotbugs	2m 29s		the patch passed
+1 💚	shadedclient	24m 41s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	2m 26s		hadoop-hdfs-client in the patch passed.
+1 💚	asflicense	0m 37s		The patch does not generate ASF License warnings.
		115m 21s

Subsystem	Report/Notes
Docker	ClientAPI=1.42 ServerAPI=1.42 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5404/1/artifact/out/Dockerfile
GITHUB PR	#5404
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux f0cb8873113b 4.15.0-200-generic #211-Ubuntu SMP Thu Nov 24 18:16:04 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / c6bed95
Default Java	Private Build-1.8.0_352-8u352-ga-1~20.04-b08
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.17+8-post-Ubuntu-1ubuntu220.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_352-8u352-ga-1~20.04-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5404/1/testReport/
Max. process+thread count	564 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-client U: hadoop-hdfs-project/hadoop-hdfs-client
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5404/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[ayushtkn]

LGTM

[slfan1989]

Merged. @zhtttylz Thanks for the contribution! @ayushtkn Thanks for reviewing the code!

[zhtttylz]

Thanks @slfan1989 @ayushtkn help review and merged.