Make WPAD and DHCP tests not reliant on NPM

[nmoinvaz]

I'm tired of all the npm security alerts for a testing framework.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.64789% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.83%. Comparing base (df114f1) to head (0bab71e).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
test/test_wpad_dns_fetch.cc	78.04%	6 Missing and 3 partials ⚠️
wpad_dns.c	85.48%	5 Missing and 4 partials ⚠️
test/test_wpad_dhcp.cc	99.37%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
+ Coverage   58.57%   63.83%   +5.26%     
==========================================
  Files          32       34       +2     
  Lines        2607     2912     +305     
  Branches      526      546      +20     
==========================================
+ Hits         1527     1859     +332     
+ Misses        745      707      -38     
- Partials      335      346      +11     

Flag	Coverage Δ
macos	60.84% <94.64%> (+5.77%)	⬆️
macos_duktape	66.08% <94.64%> (+6.12%)	⬆️

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[Copilot]

Pull request overview

This PR removes the Node/Yarn-based WPAD/DHCP test infrastructure and replaces it with native unit-testable helpers plus new GoogleTest coverage, aiming to eliminate NPM-related security alerts from CI while still validating WPAD behavior.

Changes:

• Refactors WPAD DNS logic to generate candidate URLs via a helper (wpad_dns_get_urls) and adds a test-only fetch hook for deterministic unit tests.
• Extracts DHCP parsing structures/constants into a private header and exposes selected helpers to tests via PROXYRES_TESTING / PROXYRES_TESTABLE.
• Deletes Yarn/NPM test assets and updates CI workflows to run without Node (uses Python’s http.server).

Reviewed changes

Copilot reviewed 19 out of 20 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
wpad_dns.h	Adds URL list + test hook APIs for WPAD DNS.
wpad_dns.c	Implements URL generation/freeing and swaps DNS fetch loop to iterate generated URLs; adds test fetch indirection.
wpad_dhcp_posix_p.h	New private header for DHCP message layout/constants and (test-only) helper declarations.
wpad_dhcp_posix.c	Switches DHCP helper functions to PROXYRES_TESTABLE for unit testing and moves constants/types to the private header.
testing.h	Introduces PROXYRES_TESTABLE macro to toggle internal helper visibility under tests.
test/yarn.lock	Removes Yarn lockfile (Node dependency removal).
test/package.json	Removes Node/Yarn dependency manifest.
test/http_server_cmd.js	Removes Yarn/pm2-based HTTP server wrapper.
test/dhcp_server_cmd.js	Removes Yarn/pm2-based DHCP server wrapper.
test/dhcp_server.js	Removes Node-based DHCP server implementation.
test/test_wpad.cc	Removes prior integration-style WPAD tests that depended on external environment/DHCP server.
test/test_wpad_dns.cc	Adds unit tests for URL generation.
test/test_wpad_dns_fetch.cc	Adds unit tests for DNS WPAD fetch iteration via injected fetch function.
test/test_wpad_dhcp.cc	Adds unit tests for DHCP option parsing/building helpers.
test/CMakeLists.txt	Registers new tests and enables PROXYRES_TESTING for the gtest target.
CMakeLists.txt	Adds headers and enables PROXYRES_TESTING for the proxyres library when building tests.
.github/workflows/ubuntu.yaml	Removes Node install; starts Python HTTP server; runs full test suite; changes triggers.
.github/workflows/macos.yaml	Removes Node install; starts Python HTTP server; runs full test suite; changes triggers.
.github/workflows/win32.yaml	Removes Node install; starts Python HTTP server; runs full test suite; changes triggers.
.github/workflows/winrt.yaml	Changes triggers (no longer runs on push).

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[sergio-nsk]

Additional comments to Copilot.

[Copilot]

Pull request overview

Copilot reviewed 19 out of 20 changed files in this pull request and generated 7 comments.

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