test: add basic fuzz

fuzz/.gitignore

@@ -0,0 +1,4 @@
+target
+corpus
+artifacts
+coverage

fuzz/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "owned_ref_cell-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.owned_ref_cell]
+path = ".."
+
+[[bin]]
+name = "fuzz_basic_borrows"
+path = "fuzz_targets/fuzz_basic_borrows.rs"
+test = false
+doc = false
+bench = false

fuzz/fuzz_targets/fuzz_basic_borrows.rs

@@ -0,0 +1,20 @@
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use owned_ref_cell::OwnedRefCell;
+
+fuzz_target!(|data: &[u8]| {
+    let mut cell = OwnedRefCell::new(0);
+
+    for &byte in data.iter() {
+        match byte % 3 {
+            0 => {
+                let _ = cell.try_borrow();
+            }
+            1 => {
+                let _ = cell.try_borrow_mut();
+            }
+            _ => {}
+        }
+    }
+});