Simple test for extend_from_bitset.

src/lib.rs

@@ -2,7 +2,7 @@ use std::ops;
 use std::iter::FromIterator;
 use std::default::Default;
 use std::hash::{BuildHasherDefault, Hasher};
-use std::collections::{HashMap, HashSet};
+use std::collections::HashMap;
 
 const BITS: u64 = 64;
 
@@ -274,4 +274,20 @@ mod tests {
         assert_eq!(set.contains(4), true);
         assert_eq!(set.contains(5), true);
     }
+
+    #[test]
+    fn extend_from_bitset() {
+        let mut set = [1, 2, 3].iter().cloned().collect::<BitSet>();
+        let other = [3, 4, 5].iter().cloned().collect::<BitSet>();
+
+        set.extend_from_bitset(&other);
+
+        assert_eq!(set.len(), 5);
+
+        assert_eq!(set.contains(1), true);
+        assert_eq!(set.contains(2), true);
+        assert_eq!(set.contains(3), true);
+        assert_eq!(set.contains(4), true);
+        assert_eq!(set.contains(5), true);
+    }
 }