Add 740 total tests (up from ~200) covering:
- Compile-time interface compliance for all providers
- GetCapabilities assertions for every provider
- Parse function edge cases: empty, malformed, single-entry, multi-entry
- apt: extract inline parse logic into testable functions (parsePolicyCandidate,
parseUpgradeSimulation, parseHoldList, parseOwner, parseSourcesLine)
- dnf/rpm: edge cases for both dnf4 and dnf5 parsers, normalize/parseArch
- pacman/aur: parseUpgrades, parseGroupPkgSet, capabilities
- apk: parseUpgradeSimulation, parseListLine, SupportsDryRun
- flatpak/snap: semverCmp, stripNonNumeric edge cases
- pkg/ports: all parse functions with thorough edge cases
Every provider now has:
- Interface compliance checks (what it implements AND what it doesn't)
- Capabilities test via snack.GetCapabilities()
- Parse function unit tests with table-driven edge cases
- Fix bug in extractURL where multi-token option blocks like
[arch=amd64 signed-by=/path/key.gpg] were not properly skipped,
causing the option value to be returned instead of the URL
- Add comprehensive unit tests for parseList, parseSearch, parseInfo
edge cases (empty input, missing fields, special characters)
- Add unit tests for normalizeName and parseArch covering all
supported Debian architectures and edge cases
- Add unit tests for formatTargets, buildArgs (all option combos),
and extractURL (basic, options, signed-by)
- Coverage: apt package 7.5% -> 17.1%
