add a unit test to fix ci.

src/utilities/type_id.rs

@@ -9,3 +9,32 @@ pub fn calculate_type_id(input: packed::CellInput, outputs_count: usize) -> [u8;
     blake2b.finalize(&mut ret);
     ret
 }
+
+mod tests {
+    use super::*;
+    use ckb_types::packed::CellInput;
+    use ckb_types::{h256, H256};
+
+    #[test]
+    fn test_calculate_type_id() {
+        let previous_output = packed::OutPoint::new_builder()
+            .tx_hash(
+                h256!("0x806600be4ae8330e8ce3893f208d169684e0b998acf9549c07b9fd5357eb157e").pack(),
+            )
+            .index(1u32.pack())
+            .build();
+
+        let input = CellInput::new_builder()
+            .previous_output(previous_output)
+            .since(0u64.pack())
+            .build();
+        let outputs_count = 33;
+        let type_id = calculate_type_id(input.clone(), outputs_count);
+
+        // Expected value calculated manually or from a trusted source
+        let expected_type_id: H256 =
+            h256!("0xac4cd5342895c4861631310f2fd731b8f8c71682577e384b78ca3ee3361ec3a1");
+
+        assert_eq!(type_id, expected_type_id.as_bytes());
+    }
+}