content inside must not be rewritten to backticks: {out!r}"
)
assert "After paragraph." in out and "Done." in out
+
+
+class TestHeadingLevelsH1ThroughH6:
+ """Issue #1258 — `####`, `#####`, `######` previously fell through the
+ heading pass and emitted as literal text starting with `#`. Pin all six
+ levels so a future edit cannot silently regress h4–h6 again."""
+
+ def test_all_six_heading_levels_render(self, driver_path):
+ src = "# H1\n## H2\n### H3\n#### H4\n##### H5\n###### H6"
+ out = _render(driver_path, src)
+ assert "H1
" in out, f"h1 missing: {out!r}"
+ assert "H2
" in out, f"h2 missing: {out!r}"
+ assert "H3
" in out, f"h3 missing: {out!r}"
+ assert "H4
" in out, f"h4 missing: {out!r}"
+ assert "H5
" in out, f"h5 missing: {out!r}"
+ assert "H6
" in out, f"h6 missing: {out!r}"
+
+ def test_h6_does_not_partial_match_as_lower_level(self, driver_path):
+ """Replacers must run longest-first; otherwise `###### H6` could be
+ captured by the `^### ` rule and emit `### H6
`."""
+ out = _render(driver_path, "###### H6")
+ assert "H6
" in out, f"h6 must not be partial-matched: {out!r}"
+ assert "" not in out and "###" not in out
+
+ def test_h4_inline_markdown_still_processes(self, driver_path):
+ out = _render(driver_path, "#### **bold** in h4")
+ assert "bold in h4
" in out, (
+ f"inline markdown inside h4 must still render: {out!r}"
+ )