add tests

Signed-off-by: Connor Tsui <[email protected]>

Author: connortsui20

vortex-vector/src/listview/mod.rs

@@ -31,3 +31,6 @@ impl From<ListViewVectorMut> for VectorMut {
         Self::List(v)
     }
 }
+
+#[cfg(test)]
+mod tests;