[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/blockchain.py b/test/functional/blockchain.py
index a3a6cf2fb8..5d04de9940 100755
--- a/test/functional/blockchain.py
+++ b/test/functional/blockchain.py
@@ -30,12 +30,8 @@ from test_framework.util import (
     assert_is_hash_string,
 )
 
-
 class BlockchainTest(BitcoinTestFramework):
-
-    def __init__(self):
-        super().__init__()
-        self.setup_clean_chain = False
+    def set_test_params(self):
         self.num_nodes = 1
         self.extra_args = [['-stopatheight=207']]