[qa] Remove hardcoded "4 nodes" from test_framework

1 files changed, 5 insertions, 4 deletions

diff --git a/qa/rpc-tests/walletbackup.py b/qa/rpc-tests/walletbackup.py
index c3d53669c9..b991d5c761 100755
--- a/qa/rpc-tests/walletbackup.py
+++ b/qa/rpc-tests/walletbackup.py
@@ -41,15 +41,16 @@ logging.basicConfig(format='%(levelname)s: %(message)s', level=logging.INFO, str
 
 class WalletBackupTest(BitcoinTestFramework):
 
-    def setup_chain(self):
-        logging.info("Initializing test directory "+self.options.tmpdir)
-        initialize_chain_clean(self.options.tmpdir, 4)
+    def __init__(self):
+        super().__init__()
+        self.setup_clean_chain = True
+        self.num_nodes = 4
 
     # This mirrors how the network was setup in the bash test
     def setup_network(self, split=False):
         # nodes 1, 2,3 are spenders, let's give them a keypool=100
         extra_args = [["-keypool=100"], ["-keypool=100"], ["-keypool=100"], []]
-        self.nodes = start_nodes(4, self.options.tmpdir, extra_args)
+        self.nodes = start_nodes(self.num_nodes, self.options.tmpdir, extra_args)
         connect_nodes(self.nodes[0], 3)
         connect_nodes(self.nodes[1], 3)
         connect_nodes(self.nodes[2], 3)