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The internal `cj/--*` helpers were already tested; the public dispatchers (`cj/surround-word-or-region`, `cj/wrap-word-or-region`, `cj/unwrap-word-or-region`, and the four `*-in-region-or-buffer` line helpers) were the gap. 18 new tests cover the region-active branch, the thing-at-point-word branch, and the no-word-no-region message branch for the first three; the region-vs-whole-buffer branches for the line-oriented four; plus a tab-vs-space pair for indent and a partial-dedent assertion. `read-string` is stubbed for the prompt-driven wrappers; `transient-mark-mode` is let-bound on so `use-region-p` returns t in batch.
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