Add additional test coverage of `NetworkGraph` counters

This would have caught the bug fixed in 0c0cb6fccbb426924f21915053b
in our tests.

Suggested by @valentinewallace.

diff --git a/lightning/src/routing/gossip.rs b/lightning/src/routing/gossip.rs
index c2e7e70ef07ee23fae9fe8f4a2843718e686357a..c552005d9caf223cf598e9711678dbb6f5a5cf2a 100644 (file)
--- a/lightning/src/routing/gossip.rs
+++ b/lightning/src/routing/gossip.rs
@@ -2089,6 +2089,10 @@ where
                        };
                }
 
+               core::mem::drop(nodes);
+               core::mem::drop(channels);
+               self.test_node_counter_consistency();
+
                Ok(())
        }