[Repo Assist] test: add unit tests for PHPCBF class and findFiles edge cases

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Summary

Significantly improves the test suite by adding 24 new unit tests for the PHPCBF class (previously untested) and 6 edge-case tests for findFiles. Total test count grows from 7 → 36.

Changes

extension.js

• Exports PHPCBF class (exports.PHPCBF = PHPCBF) so unit tests can instantiate it directly without requiring a VS Code Extension Host.

test/phpcbf.test.js (new)

Tests PHPCBF by injecting a lightweight vscode mock via Module._resolveFilename — no extension host required. Covers:

Suite	What's tested
loadSettings	Default values, config overrides, onsave, standard, debug, tilde (~) expansion in executablePath, re-load on config change
getArgs	-lq vs -l flag (debug mode), tmpFileName placement, --standard=(value) presence/absence, argument ordering
getStandard	configSearch: false pass-through, null workspace folder, phpcs.xml discovery, .phpcs.xml priority over phpcs.xml, fallback to this.standard, null standard

test/unit.test.js

Six new edge-case tests for findFiles:

• Empty names array → null
• Empty-string directory (resolves to parent) → finds file / returns null
• Name-array priority: first match wins; falls through to second name when first absent

package.json

Updated test:unit script to run both test files: node --test test/unit.test.js test/phpcbf.test.js

Test Status

✔ PHPCBF.loadSettings (10 tests)
✔ PHPCBF.getArgs (7 tests)
✔ PHPCBF.getStandard (7 tests)
✔ findFiles (12 tests, up from 7)

tests 36 | pass 36 | fail 0

All tests pass with npm run test:unit.

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