HADOOP-19343: Remove JUnit 4 dependencies from hadoop-gcp.

[cnauroth]

Description of PR

Remove JUnit 4 dependencies from hadoop-gcp. Some use of @Test(expect = ...) needed to be converted to assertThrows.

How was this patch tested?

All existing unit tests and integration tests pass after removal of the JUnit 4 dependencies.

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

[cnauroth]

@slfan1989 , can you please reveiw?

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 34s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+0 🆗	xmllint	0m 0s		xmllint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 3 new or modified test files.
			_ HADOOP-19343 Compile Tests _
+1 💚	mvninstall	56m 5s		HADOOP-19343 passed
+1 💚	compile	0m 25s		HADOOP-19343 passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	compile	0m 24s		HADOOP-19343 passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	checkstyle	0m 24s		HADOOP-19343 passed
+1 💚	mvnsite	0m 29s		HADOOP-19343 passed
+1 💚	javadoc	0m 30s		HADOOP-19343 passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 24s		HADOOP-19343 passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	spotbugs	0m 48s		HADOOP-19343 passed
+1 💚	shadedclient	39m 41s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	12m 53s		the patch passed
+1 💚	compile	0m 17s		the patch passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javac	0m 17s		the patch passed
+1 💚	compile	0m 17s		the patch passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	javac	0m 17s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 14s		the patch passed
+1 💚	mvnsite	0m 19s		the patch passed
+1 💚	javadoc	0m 18s		the patch passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 17s		the patch passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	spotbugs	0m 43s		the patch passed
+1 💚	shadedclient	36m 57s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	0m 25s		hadoop-gcp in the patch passed.
+1 💚	asflicense	0m 37s		The patch does not generate ASF License warnings.
		155m 19s

Subsystem	Report/Notes
Docker	ClientAPI=1.51 ServerAPI=1.51 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7872/1/artifact/out/Dockerfile
GITHUB PR	#7872
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient codespell detsecrets xmllint spotbugs checkstyle
uname	Linux 29657cc9eb31 5.15.0-144-generic #157-Ubuntu SMP Mon Jun 16 07:33:10 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	HADOOP-19343 / 8cebd77
Default Java	Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7872/1/testReport/
Max. process+thread count	705 (vs. ulimit of 5500)
modules	C: hadoop-tools/hadoop-gcp U: hadoop-tools/hadoop-gcp
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7872/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.

[slfan1989]

@slfan1989 , can you please reveiw?

@cnauroth Thanks for the contribution! LGTM.

[cnauroth]

@slfan1989 , thank you for the review.