Test serde implementation.

src/lib.rs

@@ -1,4 +1,5 @@
 extern crate serde;
+extern crate serde_test;
 extern crate unreachable;
 
 use std::fmt;
@@ -9,6 +10,7 @@ use std::collections::HashMap;
 
 use serde::ser::{self, Serialize};
 use serde::de::{self, Deserialize, SeqAccess, Visitor};
+use serde_test::{assert_tokens, Token};
 
 mod hasher;
 
@@ -26,7 +28,7 @@ fn block_bit(x: u64, d: u64) -> (u64, u64) {
     (x / d, x % d)
 }
 
-#[derive(Debug)]
+#[derive(PartialEq, Debug)]
 pub struct BitSet {
     blocks: Storage,
     nbits: usize,
@@ -507,4 +509,23 @@ mod tests {
         assert_eq!(None, iter.next());
         assert_eq!(None, iter.next());
     }
+
+    #[test]
+    fn test_ser_de() {
+        let mut set = BitSet::new();
+        set.insert(20);
+        set.insert(10);
+        set.insert(30);
+
+        assert_tokens(
+            &set,
+            &[
+                Token::Seq { len: None },
+                Token::U64(10),
+                Token::U64(20),
+                Token::U64(30),
+                Token::SeqEnd,
+            ],
+        );
+    }
 }