Add fuzzing

Cargo.toml

@@ -2,6 +2,7 @@
 members = [
     "crates/*",
     "crates/test-assembly/crates/*",
+    "fuzz",
 ]
 resolver = "2"
 

fuzz/.gitignore

@@ -0,0 +1,2 @@
+corpus
+artifacts

fuzz/Cargo.toml

@@ -0,0 +1,35 @@
+[package]
+name = "fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+objc2 = { path = "../crates/objc2", default-features = false }
+
+[features]
+default = ["apple", "std"]
+std = ["objc2/std"]
+# Runtime
+apple = ["objc2/apple"]
+gnustep-1-7 = ["objc2/gnustep-1-7"]
+gnustep-1-8 = ["gnustep-1-7", "objc2/gnustep-1-8"]
+gnustep-1-9 = ["gnustep-1-8", "objc2/gnustep-1-9"]
+gnustep-2-0 = ["gnustep-1-9", "objc2/gnustep-2-0"]
+gnustep-2-1 = ["gnustep-2-0", "objc2/gnustep-2-1"]
+
+[[bin]]
+name = "class"
+path = "fuzz_targets/class.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "sel"
+path = "fuzz_targets/sel.rs"
+test = false
+doc = false

fuzz/fuzz_targets/class.rs

@@ -0,0 +1,14 @@
+#![no_main]
+use libfuzzer_sys::fuzz_target;
+use objc2::runtime::Class;
+use std::ffi::CString;
+
+fuzz_target!(|s: &str| {
+    if CString::new(s).is_ok() {
+        #[allow(clippy::eq_op)]
+        if let Some(cls) = Class::get(s) {
+            assert_eq!(s, cls.name());
+            assert_eq!(cls, cls);
+        }
+    }
+});

fuzz/fuzz_targets/sel.rs

@@ -0,0 +1,13 @@
+#![no_main]
+use libfuzzer_sys::fuzz_target;
+use objc2::runtime::Sel;
+use std::ffi::CString;
+
+fuzz_target!(|s: &str| {
+    #[allow(clippy::eq_op)]
+    if CString::new(s).is_ok() {
+        let sel = Sel::register(s);
+        assert_eq!(s, sel.name());
+        assert_eq!(sel, sel);
+    }
+});