test(writer): mutation-cover WriteRegistry — writer scope to 100%#98
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Add WriteRegistry to the writer pitest scope. It started at 95% (exercised indirectly via loadAll), with three survivors no test pinned: - register(EncodingEncoder) / register(ExtensionEncoder) `return this` — nothing asserted the fluent builder return (NullReturn survived). - empty() — NO_COVERAGE; no test used the empty factory. WriteRegistryTest covers registration, duplicate-id rejection, extension lookup, the same-builder fluent returns, and the empty/loadAll factories, using mock encoders/extensions (BDDMockito). Writer now 64/64 mutations killed (ChunkImpl + WriteRegistry), strength 100%. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Follow-up to #97. Adds
WriteRegistryto the writer pitest scope and closes its gaps.Finding
WriteRegistrystarted at 95% (exercised indirectly vialoadAll), with three survivors no test pinned:register(EncodingEncoder)/register(ExtensionEncoder)return this— nothing asserted the fluent builder return, so the NullReturn mutant survived.empty()— NO_COVERAGE; no test used the empty factory.Fix
WriteRegistryTest(BDDMockito mock encoders/extensions) covers registration, duplicate-id rejection, extension lookup, the same-builder fluent returns, and theempty()/loadAll()factories.Result
Writer 64/64 mutations killed (ChunkImpl + WriteRegistry), test strength 100%, 0 no-coverage.
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