diff --git a/test/expected/bit_functions.out b/test/expected/bit_functions.out
index 4f2833b..e512da1 100644
--- a/test/expected/bit_functions.out
+++ b/test/expected/bit_functions.out
@@ -22,6 +22,18 @@ SELECT hamming_distance('111', '000');
                 3
 (1 row)
 
+SELECT hamming_distance('10101010101010101010', '01010101010101010101');
+ hamming_distance 
+------------------
+               20
+(1 row)
+
+SELECT hamming_distance('', '');
+ hamming_distance 
+------------------
+                0
+(1 row)
+
 SELECT hamming_distance('111', '00');
 ERROR:  different bit lengths 3 and 2
 SELECT hamming_distance('111', '000'::varbit(4));
@@ -68,6 +80,18 @@ SELECT jaccard_distance('1100', '1000');
               0.5
 (1 row)
 
+SELECT jaccard_distance('10101010101010101010', '01010101010101010101');
+ jaccard_distance 
+------------------
+                1
+(1 row)
+
+SELECT jaccard_distance('', '');
+ jaccard_distance 
+------------------
+                1
+(1 row)
+
 SELECT jaccard_distance('1111', '000');
 ERROR:  different bit lengths 4 and 3
 SELECT jaccard_distance('1111', '0000'::varbit(5));
diff --git a/test/sql/bit_functions.sql b/test/sql/bit_functions.sql
index 869dfad..abec32f 100644
--- a/test/sql/bit_functions.sql
+++ b/test/sql/bit_functions.sql
@@ -2,6 +2,8 @@ SELECT hamming_distance('111', '111');
 SELECT hamming_distance('111', '110');
 SELECT hamming_distance('111', '100');
 SELECT hamming_distance('111', '000');
+SELECT hamming_distance('10101010101010101010', '01010101010101010101');
+SELECT hamming_distance('', '');
 SELECT hamming_distance('111', '00');
 SELECT hamming_distance('111', '000'::varbit(4));
 SELECT hamming_distance('111', '0000'::varbit(4));
@@ -12,6 +14,8 @@ SELECT jaccard_distance('1111', '1100');
 SELECT jaccard_distance('1111', '1000');
 SELECT jaccard_distance('1111', '0000');
 SELECT jaccard_distance('1100', '1000');
+SELECT jaccard_distance('10101010101010101010', '01010101010101010101');
+SELECT jaccard_distance('', '');
 SELECT jaccard_distance('1111', '000');
 SELECT jaccard_distance('1111', '0000'::varbit(5));
 SELECT jaccard_distance('1111', '00000'::varbit(5));