diff --git a/source/add_binary/mod.rs b/source/add_binary/mod.rs
index 5d713c7..4eb73d9 100644
--- a/source/add_binary/mod.rs
+++ b/source/add_binary/mod.rs
@@ -65,4 +65,35 @@ fn test_add_binary() {
   assert_eq!(add_binary("11".to_string(), "1".to_string()), "100");
   assert_eq!(add_binary("1010".to_string(), "1011".to_string()), "10101");
   assert_eq!(add_binary("1111".to_string(), "1111".to_string()), "11110");
+  assert_eq!(
+    add_binary(
+      "10110101010001101011001011100011\
+10100111101001010011000011000100\
+11110111001001111010110000000010\
+11100100110010110111101001100010\
+10000101100010101010000111100100\
+10100110010010100110111010011001\
+11110111011101010000000110101001\
+10000101110010101101011011011000"
+        .to_string(),
+      "11101111111010110101001000000110\
+10010101100011001110011100101111\
+10011111011100000010100111010100\
+11101111111010111010011111001011\
+00000001001010111100100000010010\
+10110001010101011100001100000010\
+11010000010010011101100000000111\
+10000100111011110110000001110100"
+        .to_string()
+    ),
+    "11010010100110010000001001110101\
+00011110100110010000101111111010\
+01001011010010111110101011101011\
+11101010010110111001000100010110\
+11000011010110110011010011111011\
+10101011110100000001100011001110\
+01100011110111110110110011011000\
+10000101010111010001101110100110\
+0"
+  );
 }