Change loom tests to use cfg(loom) internally (#314)

src/bytes.rs

@@ -903,3 +903,36 @@ unsafe fn release_shared(ptr: *mut Shared) {
     // Drop the data
     Box::from_raw(ptr);
 }
+
+// fuzz tests
+#[cfg(all(test, loom))]
+mod fuzz {
+    use std::sync::Arc;
+    use loom::thread;
+
+    use super::Bytes;
+    #[test]
+    fn bytes_cloning_vec() {
+        loom::model(|| {
+            let a = Bytes::from(b"abcdefgh".to_vec());
+            let addr = a.as_ptr() as usize;
+
+            // test the Bytes::clone is Sync by putting it in an Arc
+            let a1 = Arc::new(a);
+            let a2 = a1.clone();
+
+            let t1 = thread::spawn(move || {
+                let b: Bytes = (*a1).clone();
+                assert_eq!(b.as_ptr() as usize, addr);
+            });
+
+            let t2 = thread::spawn(move || {
+                let b: Bytes = (*a2).clone();
+                assert_eq!(b.as_ptr() as usize, addr);
+            });
+
+            t1.join().unwrap();
+            t2.join().unwrap();
+        });
+    }
+}