test_concat_roundtrips_original previously compared through
_normalise(), which strips trailing whitespace and drops blank lines.
Mutation testing showed it still passed after joining chunks with a
single newline, deleting all 635 blank lines, and appending trailing
double-spaces to every line. Blank lines are load-bearing for pandoc
(blank_before_header defaults on), so losing them merges paragraphs
and stops headings being headings while the test stays green.
Compare the raw got/want text directly to decide pass/fail. Keep
_normalise only to build the diff shown on failure, normalising both
sides first so whitespace noise doesn't swamp the real difference. If
the exact compare fails but the normalised sides match, say so
explicitly in the assertion message instead of emitting an empty diff.
rootiest
424a3c76ab
