diff --git a/test/expected/bit_functions.out b/test/expected/bit_functions.out
index 9b5bd7d..6b1487a 100644
--- a/test/expected/bit_functions.out
+++ b/test/expected/bit_functions.out
@@ -30,6 +30,8 @@ SELECT hamming_distance(B'111', B'000'::varbit(4));
                 3
 (1 row)
 
+SELECT hamming_distance(B'111', B'0000'::varbit(4));
+ERROR:  different bit lengths 3 and 4
 SELECT jaccard_distance(B'1111', B'1111');
  jaccard_distance 
 ------------------
@@ -74,3 +76,5 @@ SELECT jaccard_distance(B'1111', B'0000'::varbit(5));
                 1
 (1 row)
 
+SELECT jaccard_distance(B'1111', B'00000'::varbit(5));
+ERROR:  different bit lengths 4 and 5
diff --git a/test/sql/bit_functions.sql b/test/sql/bit_functions.sql
index 8bad1ce..8a034d8 100644
--- a/test/sql/bit_functions.sql
+++ b/test/sql/bit_functions.sql
@@ -4,6 +4,7 @@ SELECT hamming_distance(B'111', B'100');
 SELECT hamming_distance(B'111', B'000');
 SELECT hamming_distance(B'111', B'00');
 SELECT hamming_distance(B'111', B'000'::varbit(4));
+SELECT hamming_distance(B'111', B'0000'::varbit(4));
 
 SELECT jaccard_distance(B'1111', B'1111');
 SELECT jaccard_distance(B'1111', B'1110');
@@ -13,3 +14,4 @@ SELECT jaccard_distance(B'1111', B'0000');
 SELECT jaccard_distance(B'1100', B'1000');
 SELECT jaccard_distance(B'1111', B'000');
 SELECT jaccard_distance(B'1111', B'0000'::varbit(5));
+SELECT jaccard_distance(B'1111', B'00000'::varbit(5));