add afl fuzz target

tests/afl/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "jotdown-afl"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+afl = "0.11"
+jotdown = { path = "../../" }
+
+[[bin]]
+name = "gen"
+path = "src/gen.rs"

tests/afl/in/all.dj

@@ -0,0 +1,35 @@
+{.class}
+{#id}
+{attr=value}
+# heading
+
+## sub heading
+
+para
+
+::: div-class
+
+- list item
+
+    - indented list item
+
+```lang
+code block
+```
+
+:::
+
+> blockquote
+> > inner
+> > inner
+> outer
+
+[tag]: url
+[^footnote]: description
+
+inline `verbatim` _emphasis_, *strong*, ^sup^, ~sub~, {-del-}, {+ins+} \
+[link][], [text][tag], [text](url), ![alt text](src), <https://example.com>,
+<mail@example.com>, {=mark=}, 'single', "double", $`inline`, $$`display`
+{%comment%}, [span of text]{with=some .attributes}, $`<em>raw html</em>`{=html}
+
+- * - * - * -

tests/afl/src/gen.rs

@@ -0,0 +1,11 @@
+use afl::fuzz;
+
+fn main() {
+    fuzz!(|data: &[u8]| {
+        if let Ok(s) = std::str::from_utf8(data) {
+            let p = jotdown::Parser::new(s);
+            let mut output = String::new();
+            jotdown::html::push(p, &mut output);
+        }
+    });
+}