diff --git a/build.rs b/build.rs
index 23623522..4280d94e 100644
--- a/build.rs
+++ b/build.rs
@@ -12,9 +12,11 @@
 include!("./src/networking/types/service_query.rs");
 include!("./src/networking/types/protocol.rs");
 
+const WINDOWS_ICON_PATH: &str = "./resources/packaging/windows/graphics/sniffnet.ico";
 const SERVICES_LIST_PATH: &str = "./services.txt";
 
 fn main() {
+    println!("cargo:rerun-if-changed={WINDOWS_ICON_PATH}");
     println!("cargo:rerun-if-changed={SERVICES_LIST_PATH}");
 
     set_icon();
@@ -25,7 +27,7 @@ fn set_icon() {
     #[cfg(windows)]
     {
         let mut res = winres::WindowsResource::new();
-        res.set_icon("resources/packaging/windows/graphics/sniffnet.ico");
+        res.set_icon(WINDOWS_ICON_PATH);
         res.compile().unwrap();
     }
 }
diff --git a/src/networking/types/ip_version.rs b/src/networking/types/ip_version.rs
index ff56d6a0..1b844472 100644
--- a/src/networking/types/ip_version.rs
+++ b/src/networking/types/ip_version.rs
@@ -18,3 +18,25 @@ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 impl IpVersion {
     pub(crate) const ALL: [IpVersion; 2] = [IpVersion::IPv4, IpVersion::IPv6];
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_ip_version_display() {
+        for version in IpVersion::ALL {
+            match version {
+                IpVersion::IPv4 => assert_eq!(version.to_string(), "IPv4"),
+                IpVersion::IPv6 => assert_eq!(version.to_string(), "IPv6"),
+            }
+        }
+    }
+
+    #[test]
+    fn test_all_ip_versions_collection() {
+        assert_eq!(IpVersion::ALL.len(), 2);
+        assert_eq!(IpVersion::ALL.get(0).unwrap(), &IpVersion::IPv4);
+        assert_eq!(IpVersion::ALL.get(1).unwrap(), &IpVersion::IPv6);
+    }
+}
diff --git a/src/networking/types/protocol.rs b/src/networking/types/protocol.rs
index 5e2c1781..40ac658e 100644
--- a/src/networking/types/protocol.rs
+++ b/src/networking/types/protocol.rs
@@ -21,3 +21,27 @@ fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
 impl Protocol {
     pub const ALL: [Protocol; 3] = [Protocol::TCP, Protocol::UDP, Protocol::ICMP];
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_protocol_display() {
+        for protocol in Protocol::ALL {
+            match protocol {
+                Protocol::TCP => assert_eq!(protocol.to_string(), "TCP"),
+                Protocol::UDP => assert_eq!(protocol.to_string(), "UDP"),
+                Protocol::ICMP => assert_eq!(protocol.to_string(), "ICMP"),
+            }
+        }
+    }
+
+    #[test]
+    fn test_all_protocols_collection() {
+        assert_eq!(Protocol::ALL.len(), 3);
+        assert_eq!(Protocol::ALL.get(0).unwrap(), &Protocol::TCP);
+        assert_eq!(Protocol::ALL.get(1).unwrap(), &Protocol::UDP);
+        assert_eq!(Protocol::ALL.get(2).unwrap(), &Protocol::ICMP);
+    }
+}