Switch to perevir for testing

test/asciidoc.md

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+## Asciidoc
+
+``` markdown {#input}
+Before the page break.
+
+\newpage
+
+First line on a new page.
+```
+
+Asciidoc uses three *smaller-than* characters to mark a page
+break.
+
+``` asciidoc {#expected format="asciidoc"}
+Before the page break.
+
+<<<
+
+First line on a new page.
+
+```

test/form-feed.md

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+# Form Feed
+
+Form feed characters can be used in place of the `\newpage`
+command if the respective option is enabled:
+
+``` markdown {#input}
+---
+pagebreak:
+  break-on:
+    form-feed: true
+---
+
+Before the page break.
+
+
+
+First line on a new page.
+```
+
+It becomes a `\newpage` command in LaTeX output.
+
+``` latex {#expected}
+Before the page break.
+
+\newpage{}
+
+First line on a new page.
+```

test/html.md

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+## HTML
+
+``` markdown {#input}
+Before the page break.
+
+\newpage
+
+First line on a new page.
+```
+
+Asciidoc uses three *smaller-than* characters to mark a page
+break.
+
+``` html {#expected}
+<p>Before the page break.</p>
+<div style="page-break-after: always;"></div>
+<p>First line on a new page.</p>
+```

test/ms.md

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+## MS
+
+``` markdown {#input}
+Before the page break.
+
+\newpage
+
+First line on a new page.
+```
+
+A page break is simply the `.bp` macro in MS:
+
+``` ms {#expected}
+.LP
+Before the page break.
+.bp
+.PP
+First line on a new page.
+```

test/perevir.yaml

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+---
+filters:
+  - pagebreak.lua
+compare: strings
+---

test/plaintext-command.md

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+# Plaintext LaTeX Command
+
+When reading from a formats that doesn't support raw LaTeX
+snippets, the `plaintext-command` option must be enabled in order
+for the `\newpage` command being recognized as a page break
+marker.
+
+``` markdown {#input}
+---
+pagebreak:
+  break-on:
+    plaintext-command: true
+---
+
+Before the page break.
+
+\\newpage
+
+First line on a new page.
+```
+
+Note that pandoc does not parse above as raw LaTeX due to the
+double-backslash, but the `plaintext-command` option ensures that
+the filter still recognizes it as a page break.
+
+``` latex {#expected}
+Before the page break.
+
+\newpage{}
+
+First line on a new page.
+```
+
+Note that this option comes at the cost of slightly decreased
+performance.

test/typst.md

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+## Typst
+
+``` markdown {#input}
+Before the page break.
+
+\newpage
+
+First line on a new page.
+```
+
+The `#pagebreak()` command is used for Typst.
+
+``` typst {#expected}
+Before the page break.
+
+#pagebreak()
+
+First line on a new page.
+
+```