test: introduce script_util helper for creating P2PK scripts

test/functional/test_framework/script_util.py

@@ -5,14 +5,14 @@
 """Useful Script constants and utils."""
 from test_framework.script import (
     CScript,
-    hash160,
-    sha256,
     OP_0,
-    OP_DUP,
-    OP_HASH160,
     OP_CHECKSIG,
+    OP_DUP,
     OP_EQUAL,
     OP_EQUALVERIFY,
+    OP_HASH160,
+    hash160,
+    sha256,
 )
 
 # To prevent a "tx-size-small" policy rule error, a transaction has to have a
@@ -36,6 +36,11 @@ DUMMY_P2WPKH_SCRIPT = CScript([b'a' * 21])
 DUMMY_2_P2WPKH_SCRIPT = CScript([b'b' * 21])
 
 
+def key_to_p2pk_script(key):
+    key = check_key(key)
+    return CScript([key, OP_CHECKSIG])
+
+
 def keyhash_to_p2pkh_script(hash):
     assert len(hash) == 20
     return CScript([OP_DUP, OP_HASH160, hash, OP_EQUALVERIFY, OP_CHECKSIG])