Add e2e tests for Protocol Buffer client

[Copilot]

Adds end-to-end test coverage for the Protocol Buffer client transport layer, mirroring the existing CoreV1ApiTest structure.

Changes

• New test: ProtoClientTest.java in e2e/src/test/java/io/kubernetes/client/e2e/basic/
  • Tests namespace CRUD operations (create, list, get, delete) using protocol buffer encoding
  • Validates ObjectOrStatus response handling
  • Verifies protocol buffer message types (Namespace, NamespaceList, ObjectMeta)

Example Usage

ProtoClient protoClient = new ProtoClient(client);

Namespace namespace = Namespace.newBuilder()
    .setMetadata(ObjectMeta.newBuilder().setName("e2e-proto-test").build())
    .build();

ObjectOrStatus<Namespace> result = protoClient.create(
    namespace, "/api/v1/namespaces", "v1", "Namespace");

assertThat(result.object).isNotNull();
assertThat(result.status).isNull();

Test follows patterns from ProtoExample.java and uses the same testing conventions as other e2e tests in the basic package.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• groovy.jfrog.io
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.11/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.11/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.11 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.11/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/java/java org.codehaus.plexus.classworlds.launcher.Launcher spotless:check -Dspotless.check.skip=false -pl e2e (dns block)
• repository.sonatype.org
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.11/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.11/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.11 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.11/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/java/java org.codehaus.plexus.classworlds.launcher.Launcher clean compile -DskipTests -q (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Protocol Buffer client needs e2e test support</issue_title>
<issue_description>Similar to https://github.com/kubernetes-client/java/blob/master/e2e/src/test/java/io/kubernetes/client/e2e/basic/CoreV1ApiTest.java we should add a test which uses protocol buffers for transport.

There is an example of how to use protocol buffers here:
https://github.com/kubernetes-client/java/blob/master/examples/examples-release-latest/src/main/java/io/kubernetes/client/examples/ProtoExample.java</issue_description>

<agent_instructions>Please add e2e tests for the protocol buffers client.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Protocol Buffer client needs e2e test support #4382

---

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[brendandburns]

/ok-to-test

[brendandburns]

/lgtm
/approve

Thanks this is great!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brendandburns, Copilot

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• OWNERS [brendandburns]

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