test: Introduce MIN_BLOCKS_TO_KEEP constant

Author: aureleoules

test/functional/feature_pruning.py

@@ -11,6 +11,7 @@
 import os
 
 from test_framework.blocktools import (
+    MIN_BLOCKS_TO_KEEP,
     create_block,
     create_coinbase,
 )
@@ -333,7 +334,7 @@ def has_block(index):
         assert has_block(2), "blk00002.dat is still there, should be pruned by now"
 
         # advance the tip so blk00002.dat and blk00003.dat can be pruned (the last 288 blocks should now be in blk00004.dat)
-        self.generate(node, 288, sync_fun=self.no_op)
+        self.generate(node, MIN_BLOCKS_TO_KEEP, sync_fun=self.no_op)
         prune(1000)
         assert not has_block(2), "blk00002.dat is still there, should be pruned by now"
         assert not has_block(3), "blk00003.dat is still there, should be pruned by now"

test/functional/test_framework/blocktools.py

@@ -61,6 +61,7 @@
 
 NORMAL_GBT_REQUEST_PARAMS = {"rules": ["segwit"]}
 VERSIONBITS_LAST_OLD_BLOCK_VERSION = 4
+MIN_BLOCKS_TO_KEEP = 288
 
 
 def create_block(hashprev=None, coinbase=None, ntime=None, *, version=None, tmpl=None, txlist=None):