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fix(serde): make serde.zig analysable and run its 16 tests (#70) - #80
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`src/serde.zig` had never been analysed as a whole: `root.zig` reaches it
through a lazy `pub const serde = @import`, consumers instantiate only the
functions they call, and its 16 inline tests were collected by no step.
Referencing it from the test root exposed three defects:
- `autoSkipField(comptime T, field_name)` forwarded a RUNTIME
`field_name` to `save_policy.shouldSkipField`, which requires it
comptime. The runtime parameter is the right one — it is the
`skipField` contract (`fn (type, []const u8) bool`) that every
`writeComponent` / `readComponent` call site and the engine's
save path use — so the fix is on this side: compare at runtime against
the comptime skip list. Same answer, type-checks, signature unchanged.
- Six tests initialised `std.ArrayList(u8)` with `.{}` (0.16: `.empty`)
and wrote through `buf.writer(allocator)`, which no longer exists.
They now use `std.Io.Writer.Allocating` — the idiom the engine's
`save.zig` already uses for the same writer — and read `written()`.
`root.zig`'s test block now lists `serde.zig`; the suite goes 214 → 230.
Sabotage: making `autoSkipField` never skip fails its two direct tests
and the Saveable-roundtrip test that passes it as `skipField`.
Nothing in the file turned out to be dead code — every failure was a
0.16 API drift or the comptime/runtime mismatch above.
Closes #70
Claude-Session: https://claude.ai/code/session_01XBGRLojiysEr5zy1U5mbP6
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📝 WalkthroughWalkthroughThe test collector now analyzes ChangesSerde analysis and validation
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix · Severity of issue fixed: Low Merge Risk: 🔵 Low · up to Update the stale test-collector note before merging; the remaining issue has limited impact on runtime behavior. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 inconclusive)
✅ Passed checks (4 passed)
Full details: Linked Issues checkExplanation The pull request implements the required wiring for [ ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@src/root.zig`:
- Line 284: Update the exclusion note near the serde.zig import to remove the
obsolete claim that serde.zig is absent and its tests are uncollected; ensure
the comment accurately reflects the current test collector behavior.
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…uded CodeRabbit on #80: the block above the test list still described serde.zig as deliberately absent with its tests uncollected, one line above the import that collects them. Claude-Session: https://claude.ai/code/session_01XBGRLojiysEr5zy1U5mbP6
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Closes #70.
serde.zighad never been analysed as a whole — lazy@import, callers instantiate only what they use, 16 inline tests collected by no step. Referencing it from the test root exposed three defects, none of them dead code:autoSkipFieldforwards a runtimefield_nametoshouldSkipField, which requires it comptimeskipFieldfn-pointer contract every call site and the engine'ssave.ziguse — so the signature stays and the engine is unaffectedArrayList(u8)with.{}.emptybuf.writer(allocator)(gone in 0.16)std.Io.Writer.Allocating+written()— the same idiom the engine'ssave.zig:162uses for this exact writerroot.zig's test block now listsserde.zig: suite 214 → 230 (the 16). Sabotage —autoSkipFieldnever skips — fails its two direct tests and the Saveable-roundtrip test that passes it asskipField, i.e. the way the engine does.Same family as labelle-gfx#363: "add a test" is not enough on its own; the file has to be reachable from a test context, proven by sabotage.
https://claude.ai/code/session_01XBGRLojiysEr5zy1U5mbP6
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