test: add unit tests for NERService (Fixes #440)

[zeroknowledge0x]

Fixes #440

Summary

Adds unit tests for NERService in backend/services/ner_service.py. All 17 tests pass with ML dependencies mocked.

Changes

• Created backend/tests/test_ner_service.py with 17 test cases
• Tests _clean_label(): O tag, B-B-, I-B-, B-, I- prefixes, unknown labels
• Tests REGEX_PATTERNS: IP address, hostname, network error, VLAN, database, browser
• Tests extract_entities(): empty text handling, regex fallback for IP addresses
• Tests load(): idempotency, missing model error
• All heavy dependencies mocked (torch, transformers)

Testing

python -m pytest backend/tests/test_ner_service.py -v --noconftest

Result: 17 passed in 0.26s

Test Coverage

Category	Tests	Description
Init	1	Default state
_clean_label	6	O, B-B-, I-B-, B-, I-, unknown
REGEX_PATTERNS	6	IP, hostname, network error, VLAN, database, browser
extract_entities	2	Empty text, regex IP fallback
load	2	Idempotent, missing model

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Reviewing files that changed from the base of the PR and between da8faf2 and 7636425.

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• backend/tests/test_ner_service.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[ritesh-1918]

Hi @zeroknowledge0x! 🙌

Thank you so much for your excellent contribution: "test: add unit tests for NERService (Fixes #440)"! We really appreciate the high-quality code and effort you have put into the platform.

Just a quick, friendly heads-up as we prepare our manual merging and verification queues—please make sure to complete all the mandatory community steps listed below.

Once those manual steps are verified, we'll get your PR officially merged into the gssoc branch (or keep it neatly cataloged if closed as integrated) and assign it the highest possible GSSoC S-Tier labels to maximize your leaderboard points!

Let's build something amazing together! 🚀🔥

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[ritesh-1918]

Hi @zeroknowledge0x! 🙌

Thank you so much for your excellent contribution: "test: add unit tests for NERService (Fixes #440)"! We really appreciate the high-quality code and effort you have put into the platform.

Just a quick, friendly heads-up as we prepare our manual merging and verification queues—please make sure to complete all the mandatory community steps listed below.

Once those manual steps are verified, we'll get your PR officially merged into the gssoc branch (or keep it neatly cataloged if closed as integrated) and assign it the highest possible GSSoC S-Tier labels to maximize your leaderboard points!

Let's build something amazing together! 🚀🔥

---

🌟 Community Support & Network Steps (Take 10 Seconds!)

As we prepare our manual verification and merging queues, please make sure you have taken a moment to complete these required steps to finalize your points:

1. ⭐ Star this repository: https://github.com/ritesh-1918/HELPDESK.AI (Mandatory)
2. 🍴 Fork this repository: https://github.com/ritesh-1918/HELPDESK.AI/fork (Mandatory)
3. 👤 Follow @ritesh-1918 on GitHub: https://github.com/ritesh-1918 (Mandatory - manual step)
4. 💼 Connect on LinkedIn: https://www.linkedin.com/in/ritesh1908/ (Mandatory)

Note: Having these steps completed manually is required before your PR points are officially cleared.