[tests] don't override __init__() in individual tests

Almost all test scripts currently need to override the __init__()
method. When they do that they need to call into super().__init__() as
the base class does some generic initialization.

This commit makes the base class __init__() call into set_test_params()
method. Individual test cases can override set_test_params() to setup
their test parameters.

1 files changed, 1 insertions, 3 deletions

diff --git a/test/functional/segwit.py b/test/functional/segwit.py
index 51eaa34a54..c08fbd3e77 100755
--- a/test/functional/segwit.py
+++ b/test/functional/segwit.py
@@ -75,9 +75,7 @@ def find_unspent(node, min_value):
             return utxo
 
 class SegWitTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
+    def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 3
         self.extra_args = [["-walletprematurewitness", "-rpcserialversion=0"],