test: add tx_in_orphanage()

Allows tests to check if a transaction
is contained within the orphanage

test/functional/test_framework/mempool_util.py

@@ -8,6 +8,7 @@ from decimal import Decimal
 from .blocktools import (
     COINBASE_MATURITY,
 )
+from .messages import CTransaction
 from .util import (
     assert_equal,
     assert_greater_than,
@@ -83,3 +84,8 @@ def fill_mempool(test_framework, node, *, tx_sync_fun=None):
     test_framework.log.debug("Check that mempoolminfee is larger than minrelaytxfee")
     assert_equal(node.getmempoolinfo()['minrelaytxfee'], Decimal('0.00001000'))
     assert_greater_than(node.getmempoolinfo()['mempoolminfee'], Decimal('0.00001000'))
+
+def tx_in_orphanage(node, tx: CTransaction) -> bool:
+    """Returns true if the transaction is in the orphanage."""
+    found = [o for o in node.getorphantxs(verbosity=1) if o["txid"] == tx.rehash() and o["wtxid"] == tx.getwtxid()]
+    return len(found) == 1