feat: snapshot inline diff — line-by-line diff on mismatch#38
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Closes #32. match_turbo_stream_snapshot failure_message now uses Diff::LCS to produce a line-by-line diff (stored → actual) instead of dumping raw before/after strings. Changed lines are prefixed with - or + and a whitespace-only fallback message is shown when the strip-normalized strings differ only in surrounding whitespace. 304 examples, 100% line and branch coverage. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Closes #32.
Summary
match_turbo_stream_snapshotfailure message now shows adiff/lcs-powered line-by-line diff instead of raw before/after strings.Before:
After:
diff-lcsis already available as a transitive dependency via RSpec — no new gem dependency added.Test plan
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