markdownlint/test/required-headings-all-present.md

# One

## Two

### THREE

## four

## Five

### SiX

<!-- markdownlint-configure-file {
  "MD043": {
    "headings": [
      "# One",
      "## Two",
      "### Three",
      "## Four",
      "## Five",
      "### Six"
    ]
  }
} -->