Merge #15102: test: Run invalid_txs.InputMissing test in feature_block

fac4e731a8 test: Run invalid_txs.InputMissing test in feature_block (MarcoFalke)

Pull request description:

Tree-SHA512: 24c3f519ba0cf417b66e0df6f5ddc0430e3f419af4705a9c85096da47ff4d8f51487d65b68f3f993800003b3f936d95d8a0bade846e1b45f95b2bdbecc9ebab7

1 files changed, 17 insertions, 8 deletions

diff --git a/test/functional/feature_block.py b/test/functional/feature_block.py
index 697a0b19ac..244cde044e 100755
--- a/test/functional/feature_block.py
+++ b/test/functional/feature_block.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright (c) 2015-2018 The Bitcoin Core developers
+# Copyright (c) 2015-2019 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test block processing."""
@@ -137,12 +137,6 @@ class FullBlockTest(BitcoinTestFramework):
         for TxTemplate in invalid_txs.iter_all_templates():
             template = TxTemplate(spend_tx=attempt_spend_tx)
 
-            # Something about the serialization code for missing inputs creates
-            # a different hash in the test client than on bitcoind, resulting
-            # in a mismatching merkle root during block validation.
-            # Skip until we figure out what's going on.
-            if TxTemplate == invalid_txs.InputMissing:
-                continue
             if template.valid_in_block:
                 continue
 
@@ -150,7 +144,22 @@ class FullBlockTest(BitcoinTestFramework):
             blockname = "for_invalid.%s" % TxTemplate.__name__
             badblock = self.next_block(blockname)
             badtx = template.get_tx()
-            self.sign_tx(badtx, attempt_spend_tx)
+            if TxTemplate != invalid_txs.InputMissing:
+                self.sign_tx(badtx, attempt_spend_tx)
+            else:
+                # Segwit is active in regtest at this point, so to deserialize a
+                # transaction without any inputs correctly, we set the outputs
+                # to an empty list. This is a hack, as the serialization of an
+                # empty list of outputs is deserialized as flags==0 and thus
+                # deserialization of the outputs is skipped.
+                # A policy check requires "loose" txs to be of a minimum size,
+                # so vtx is not set to be empty in the TxTemplate class and we
+                # only apply the workaround where txs are not "loose", i.e. in
+                # blocks.
+                #
+                # The workaround has the purpose that both sides calculate
+                # the same tx hash in the merkle tree
+                badtx.vout = []
             badtx.rehash()
             badblock = self.update_block(blockname, [badtx])
             self.sync_blocks(