Add fuzz testing

Closes GH-7.

4 files changed, 49 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index 0e0f1b9..b40bec5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,6 @@ coverage/
 target
 commonmark-data.txt
 unicode-data.txt
+fuzz/target
+fuzz/corpus
+fuzz/artifacts
diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
new file mode 100644
index 0000000..3c19003
--- /dev/null
+++ b/fuzz/Cargo.toml
@@ -0,0 +1,25 @@
+[package]
+name = "micromark-fuzz"
+version = "0.0.0"
+authors = ["Automatically generated"]
+publish = false
+edition = "2018"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.micromark]
+path = ".."
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "micromark"
+path = "fuzz_targets/micromark.rs"
+test = false
+doc = false
diff --git a/fuzz/fuzz_targets/micromark.rs b/fuzz/fuzz_targets/micromark.rs
new file mode 100644
index 0000000..f4d2927
--- /dev/null
+++ b/fuzz/fuzz_targets/micromark.rs
@@ -0,0 +1,16 @@
+#![no_main]
+use libfuzzer_sys::fuzz_target;
+extern crate micromark;
+
+fuzz_target!(|data: &[u8]| {
+    if let Ok(s) = std::str::from_utf8(data) {
+        let _ = micromark::micromark(s);
+        let _ = micromark::micromark_with_options(
+            s,
+            &micromark::Options {
+                constructs: micromark::Constructs::gfm(),
+                ..micromark::Options::default()
+            },
+        );
+    }
+});
diff --git a/readme.md b/readme.md
index ac22d1c..c8ed452 100644
--- a/readme.md
+++ b/readme.md
@@ -372,6 +372,11 @@ The following scripts are useful when working on this project:
   ```sh
   cargo doc --document-private-items
   ```
+- fuzz:
+  ```sh
+  cargo install cargo-fuzz
+  cargo +nightly fuzz run micromark
+  ```
 
 ### Version