Assert eviction at >= 29 candidates. Assert non-eviction at <= 20 candidates.

Author: practicalswift

src/test/net_tests.cpp

@@ -893,6 +893,20 @@ BOOST_AUTO_TEST_CASE(node_eviction_test)
                 },
                 {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19}, random_context));
 
+            // An eviction is expected given >= 29 random eviction candidates. The eviction logic protects at most
+            // four peers by net group, eight by lowest ping time, four by last time of novel tx, up to eight non-tx-relay
+            // peers by last novel block time, and four more peers by last novel block time.
+            if (number_of_nodes >= 29) {
+                BOOST_CHECK(SelectNodeToEvict(GetRandomNodeEvictionCandidates(number_of_nodes, random_context)));
+            }
+
+            // No eviction is expected given <= 20 random eviction candidates. The eviction logic protects at least
+            // four peers by net group, eight by lowest ping time, four by last time of novel tx and four peers by last
+            // novel block time.
+            if (number_of_nodes <= 20) {
+                BOOST_CHECK(!SelectNodeToEvict(GetRandomNodeEvictionCandidates(number_of_nodes, random_context)));
+            }
+
             // Cases left to test:
             // * "Protect the half of the remaining nodes which have been connected the longest. [...]"
             // * "Pick out up to 1/4 peers that are localhost, sorted by longest uptime. [...]"