[CI/Build] Fail e2e tests when accuracy is 0%

[Xunzhuo]

Description

This PR adds error handling to domain classification, PII detection, and jailbreak detection e2e tests to ensure they fail explicitly when accuracy is 0%.

Motivation

Previously, these tests would return nil (success) even when all test cases failed, which could mask critical issues in the routing and detection logic. This change makes test failures more visible and actionable by returning a descriptive error when correctTests == 0.

Changes

• Added zero-accuracy check in testDomainClassify() function
• Added zero-accuracy check in testPIIDetection() function
• Added zero-accuracy check in testJailbreakDetection() function
• All three tests now return an error with format: "<test-name> test failed: 0% accuracy (0/<total> correct)"

Testing

The changes ensure that:

• Tests fail explicitly when accuracy is 0%
• Error messages clearly indicate which test failed and the total number of test cases
• Existing behavior is preserved when accuracy > 0%

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Pull Request opened by Augment Code with guidance from the PR author

[github-actions]

👥 vLLM Semantic Team Notification

The following members have been identified for the changed files in this PR and have been automatically assigned:

📁 e2e

Owners: @Xunzhuo
Files changed:

• e2e/testcases/domain_classify.go
• e2e/testcases/jailbreak_detection.go
• e2e/testcases/pii_detection.go

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🎉 Thanks for your contributions!

This comment was automatically generated based on the OWNER files in the repository.

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[wangchen615]

LGTM