Add round-trip idempotency tests#62
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Add an all-fixtures sweep asserting that canonical output (a parsed playlist re-rendered) is a fixed point of parse-then- render, plus a seeded generator that builds varied media and master playlists and asserts the same property. These guard the reader and writer against round-trip asymmetries. The generator uses a fixed RNG seed so results are deterministic across supported Ruby versions.
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Add an all-fixtures sweep asserting that canonical output (a parsed playlist re-rendered) is a fixed point of parse-then- render, plus a seeded generator that builds varied media and master playlists and asserts the same property. These guard the reader and writer against round-trip asymmetries.
The generator uses a fixed RNG seed so results are deterministic across supported Ruby versions.