Add test to ensure data can be shared through shmem

tests/general.rs

@@ -89,3 +89,29 @@ fn open_flink() {
 
     drop(s2);
 }
+
+#[test]
+fn share_data() {
+    let s1 = ShmemConf::new()
+        .size(core::mem::size_of::<u32>())
+        .create()
+        .unwrap();
+
+    // Open with the unique os id
+    let os_id = s1.get_os_id().to_string();
+    let s2 = ShmemConf::new().os_id(&os_id).open().unwrap();
+
+    let ptr1 = s1.as_ptr() as *mut u32;
+    let ptr2 = s2.as_ptr() as *mut u32;
+
+    // Confirm that the two pointers are different
+    assert_ne!(ptr1, ptr2);
+
+    // Write a value from s1 and read it from s2
+    unsafe {
+        let shared_val = 0xBADC0FEE;
+        ptr1.write_volatile(shared_val);
+        let read_val = ptr2.read_volatile();
+        assert_eq!(read_val, shared_val);
+    }
+}