Completed first draft of create_subnet() and added additional tests. NOTE: One test is still failing in order to outline the fact that there is still a slight bug in the code

src/main.rs

@@ -5,7 +5,6 @@ use crate::networking::Network;
 
 mod networking;
 
-#[allow(unused_variables, unused_mut, unused_assignments)]
 fn main() {
     println!("Enter the IP and cidr for your given network");
     

src/networking/mod.rs

@@ -58,17 +58,12 @@ impl Network {
         //let subnet_mask = Network::gen_subnet_mask(cidr)?.to_arr()?;
 
         // If the CIDR < class network enum associated value, then there is an invalid subnet.
-        if cidr <= network_class as u8 {
+        if cidr < network_class as u8 {
             return Err(NetworkingErr::InvalidCIDRErr)
         }
         
         let num_borrowed_bits = cidr - network_class as u8;
 
-        //If no subnetting is required, just return the base address
-        if num_borrowed_bits == 0 {
-            unimplemented!();
-        }
-
         // Determine the starting network
         let mut base_network = network_address.clone();
         let most_sig_octet: u8 = match network_class {
@@ -239,5 +234,16 @@ mod tests {
         use super::*;
 
         assert_eq!(Network::create_subnet(&IpAddr::V4(192, 168, 0, 1), 23).unwrap_err(), NetworkingErr::InvalidCIDRErr);
+
+        let networks = Network::create_subnet(&IpAddr::V4(127, 0, 0, 1), 10).unwrap();
+        assert_eq!(networks.len(), 4);
+
+        let networks = Network::create_subnet(&IpAddr::V4(192, 168, 200, 1), 31).unwrap();
+        assert_eq!(networks.len(), 128);
+        assert_eq!(networks.last().unwrap(), &IpAddr::V4(192, 168, 200, 254));
+
+        let networks = Network::create_subnet(&IpAddr::V4(127, 0, 0, 0), 8).unwrap();
+        assert_eq!(networks.len(), 1);
+        assert_eq!(networks.last().unwrap(), &IpAddr::V4(127, 0, 0, 0));
     }
 }