xmr: Add prefunded itx.

basicswap/protocols/__init__.py

@@ -4,9 +4,21 @@
 # Distributed under the MIT software license, see the accompanying
 # file LICENSE or http://www.opensource.org/licenses/mit-license.php.
 
+from basicswap.script import (
+    OpCodes,
+)
+
 
 class ProtocolInterface:
     swap_type = None
 
     def getFundedInitiateTxTemplate(self, ci, amount: int, sub_fee: bool) -> bytes:
         raise ValueError('base class')
+
+    def getMockScript(self) -> bytearray:
+        return bytearray([
+            OpCodes.OP_RETURN, OpCodes.OP_1])
+
+    def getMockScriptScriptPubkey(self, ci) -> bytearray:
+        script = self.getMockScript()
+        return ci.get_p2wsh_script_pubkey(script) if ci._use_segwit else ci.get_p2sh_script_pubkey(script)