|  | Add test coverage for 4 functions in custom-misc.el:
  - cj/replace-fraction-glyphs (24 tests)
  - cj/format-region-or-buffer (17 tests)
  - cj/count-words-buffer-or-region (20 tests)
  - cj/jump-to-matching-paren (18 tests)
  Refactored functions using internal/interactive split pattern:
  - Internal functions (cj/--function-name) contain business logic with
    explicit parameters and validation
  - Interactive wrappers handle UI concerns (region detection, messages)
  - Tests call internal functions directly (no mocking required)
  Bug Fix: cj/--replace-fraction-glyphs
  Fixed "Invalid search bound" error when converting glyphs to text.
  Original code used fixed end position which became invalid when
  replacements changed buffer size. Fixed by using copy-marker for
  dynamic end position tracking. |