unittest for bind two consecutive ports (#23008)

* minor fix of comments in fork-selection tests

* fix doc link

* add unittest for bind_two_consecutive_in_range

core/tests/fork-selection.rs

@@ -1,13 +1,13 @@
 //! Fork Selection Simulation
 //!
-//! Description of the algorithm can be found in [docs/src/fork-selection.md](docs/src/fork-selection.md).
+//! Description of the algorithm can be found in [docs/src/cluster/managing-forks.md](docs/src/cluster/managing-forks.md).
 //!
 //! A test library function exists for configuring networks.
 //! ```
 //!     /// * num_partitions - 1 to 100 partitions
 //!     /// * fail_rate - 0 to 1.0 rate of packet receive failure
 //!     /// * delay_count - number of forks to observe before voting
-//!     /// * parasite_rate - number of parasite nodes that vote opposite the greedy choice
+//!     /// * parasite_rate - percentage of parasite nodes that vote opposite the greedy choice
 //!     fn test_with_partitions(num_partitions: usize, fail_rate: f64, delay_count: usize, parasite_rate: f64);
 //! ```
 //! Modify the test function
@@ -497,7 +497,7 @@ fn test_no_partitions() {
 /// * num_partitions - 1 to 100 partitions
 /// * fail_rate - 0 to 1.0 rate of packet receive failure
 /// * delay_count - number of forks to observe before voting
-/// * parasite_rate - number of parasite nodes that vote opposite the greedy choice
+/// * parasite_rate - percentage of parasite nodes that vote opposite the greedy choice
 fn test_with_partitions(
     num_partitions: usize,
     fail_rate: f64,

net-utils/src/lib.rs

@@ -790,4 +790,14 @@ mod tests {
             3,
         ));
     }
+
+    #[test]
+    fn test_bind_two_consecutive_in_range() {
+        solana_logger::setup();
+        let ip_addr = IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0));
+        if let Ok(((port1, _), (port2, _))) = bind_two_consecutive_in_range(ip_addr, (1024, 65535))
+        {
+            assert!(port2 == port1 + 1);
+        }
+    }
 }