[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, 5 deletions

diff --git a/test/functional/mempool_persist.py b/test/functional/mempool_persist.py
index dc5a3263ff..01f65b1373 100755
--- a/test/functional/mempool_persist.py
+++ b/test/functional/mempool_persist.py
@@ -36,12 +36,8 @@ from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import *
 
 class MempoolPersistTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
-        # We need 3 nodes for this test. Node1 does not have a persistent mempool.
+    def set_test_params(self):
         self.num_nodes = 3
-        self.setup_clean_chain = False
         self.extra_args = [[], ["-persistmempool=0"], []]
 
     def run_test(self):