ERROR: Add failing test to check compatibility with old signet

Author: jtimon

test/functional/feature_signet.py

@@ -26,7 +26,7 @@ def add_options(self, parser):
 
     def set_test_params(self):
         self.setup_clean_chain = True
-        self.num_nodes = 3
+        self.num_nodes = 4
         self.extra_args = [[
             '-fallbackfee=0.00001',
             '-addresstype=legacy',
@@ -38,7 +38,7 @@ def set_test_params(self):
             '-secretprefix=217',
             '-extpubkeyprefix=043587CF',
             '-extprvkeyprefix=04358394',
-        ]] * 3
+        ]] * self.num_nodes
 
     def setup_network(self):
 
@@ -73,6 +73,13 @@ def setup_network(self):
 
     def run_test(self):
 
+        self.log.info('Check compatibility with old signet...')
+        self.extra_args[3].append('-con_genesis_style=signet_old')
+        self.extra_args[3].append('-signet_blockscript=512103e464a9f3070da4d3e0b34ce971ff36f3e07c47a8f4beadf32e8ea7e2afa8a82451ae')
+        self.start_node(3)
+        assert_equal(self.nodes[0].getblockhash(0), '22861f488a5c6cb033a843e476581a8abf5b82a34926babfde1241ed97ba268e')
+
+        self.log.info('Generate a few blocks...')
         self.nodes[0].generate(100)
         self.sync_all([self.nodes[0:1]])
         self.nodes[1].generate(100)