Improve script_x_only_key test.

Co-authored-by: Dr. Maxim Orlovsky <orlovsky@pandoracore.com>

src/blockdata/script.rs

@@ -1124,16 +1124,13 @@ mod test {
 
     #[test]
     fn script_x_only_key() {
-        let mut comp = vec![];
-        let mut script = Builder::new();
-        assert_eq!(&script[..], &comp[..]);
         // Notice the "20" which prepends the keystr. That 20 is hexidecimal for "32". The Builder automatically adds the 32 opcode
         // to our script in order to give a heads up to the script compiler that it should add the next 32 bytes to the stack.
-        // To mimic the Builder's automatic insertion of the 32 opcode, we manually add it to the Vec and slice it out in the from_str.
         // From: https://github.com/bitcoin-core/btcdeb/blob/e8c2750c4a4702768c52d15640ed03bf744d2601/doc/tapscript-example.md?plain=1#L43
         let keystr = "209997a497d964fc1a62885b05a51166a65a90df00492c8d7cf61d6accf54803be";
         let x_only_key = XOnlyPublicKey::from_str(&keystr[2..]).unwrap();
-        script = script.push_x_only_key(&x_only_key); comp.extend(Vec::from_hex(keystr).unwrap().iter().cloned()); assert_eq!(&script[..], &comp[..]);
+        let script = Builder::new().push_x_only_key(&x_only_key); 
+        assert_eq!(&script[..], &Vec::from_hex(keystr).unwrap());
     }
 
     #[test]