test: -peerblockfilters without -blockfilterindex raises an error

test/functional/p2p_blockfilters.py

@@ -244,6 +244,12 @@ class CompactFiltersTest(BitcoinTestFramework):
             peer_0.send_message(request)
             peer_0.wait_for_disconnect()
 
+        self.log.info("Test -peerblockfilters without -blockfilterindex raises an error")
+        self.stop_node(0)
+        self.nodes[0].extra_args = ["-peerblockfilters"]
+        msg = "Error: Cannot set -peerblockfilters without -blockfilterindex."
+        self.nodes[0].assert_start_raises_init_error(expected_msg=msg)
+
 
 def compute_last_header(prev_header, hashes):
     """Compute the last filter header from a starting header and a sequence of filter hashes."""