test: improve assertions in feature_blockfilterindex_prune.py

test/functional/feature_blockfilterindex_prune.py

@@ -16,36 +16,48 @@ class FeatureBlockfilterindexPruneTest(BitcoinTestFramework):
         self.num_nodes = 2
         self.extra_args = [["-fastprune", "-prune=1"], ["-fastprune", "-prune=1", "-blockfilterindex=1"]]
 
+    def sync_index(self, height):
+        expected = {'basic block filter index': {'synced': True, 'best_block_height': height}}
+        self.wait_until(lambda: self.nodes[1].getindexinfo() == expected)
+
     def run_test(self):
         self.log.info("check if we can access a blockfilter when pruning is enabled but no blocks are actually pruned")
-        self.wait_until(lambda: self.nodes[1].getindexinfo() == {'basic block filter index': {'synced': True, 'best_block_height': 200}})
-        assert len(self.nodes[1].getblockfilter(self.nodes[1].getbestblockhash())['filter']) > 0
+        self.sync_index(height=200)
+        assert_greater_than(len(self.nodes[1].getblockfilter(self.nodes[1].getbestblockhash())['filter']), 0)
         # Mine two batches of blocks to avoid hitting NODE_NETWORK_LIMITED_MIN_BLOCKS disconnection
         self.nodes[1].generate(250)
         self.sync_all()
         self.nodes[1].generate(250)
         self.sync_all()
-        self.wait_until(lambda: self.nodes[1].getindexinfo() == {'basic block filter index': {'synced': True, 'best_block_height': 700}})
+        self.sync_index(height=700)
+
         self.log.info("prune some blocks")
         pruneheight = self.nodes[1].pruneblockchain(400)
         assert_equal(pruneheight, 250)
+
         self.log.info("check if we can access the tips blockfilter when we have pruned some blocks")
-        assert len(self.nodes[1].getblockfilter(self.nodes[1].getbestblockhash())['filter']) > 0
+        assert_greater_than(len(self.nodes[1].getblockfilter(self.nodes[1].getbestblockhash())['filter']), 0)
+
         self.log.info("check if we can access the blockfilter of a pruned block")
-        assert len(self.nodes[1].getblockfilter(self.nodes[1].getblockhash(2))['filter']) > 0
+        assert_greater_than(len(self.nodes[1].getblockfilter(self.nodes[1].getblockhash(2))['filter']), 0)
+
         self.log.info("start node without blockfilterindex")
         self.stop_node(1)
         self.start_node(1, extra_args=self.extra_args[0])
+
         self.log.info("make sure accessing the blockfilters throws an error")
         assert_raises_rpc_error(-1, "Index is not enabled for filtertype basic", self.nodes[1].getblockfilter, self.nodes[1].getblockhash(2))
         self.nodes[1].generate(1000)
+
         self.log.info("prune below the blockfilterindexes best block while blockfilters are disabled")
         pruneheight_new = self.nodes[1].pruneblockchain(1000)
         assert_greater_than(pruneheight_new, pruneheight)
         self.stop_node(1)
+
         self.log.info("make sure we get an init error when starting the node again with block filters")
         with self.nodes[1].assert_debug_log(["basic block filter index best block of the index goes beyond pruned data. Please disable the index or reindex (which will download the whole blockchain again)"]):
             self.nodes[1].assert_start_raises_init_error(extra_args=self.extra_args[1])
+
         self.log.info("make sure the node starts again with the -reindex arg")
         reindex_args = self.extra_args[1]
         reindex_args.append("-reindex")