diff --git a/src/core/global.rs b/src/core/global.rs
index a130f3d..52389e8 100644
--- a/src/core/global.rs
+++ b/src/core/global.rs
@@ -8,7 +8,7 @@ pub struct Domain<'a> {
 impl<'a> PartialEq for Domain<'a> {
     /// Enables comparison between two domain objects.
     fn eq(&self, other: &Self) -> bool {
-        self.subdomain == other.subdomain && self.domain == other.domain
+        self.subdomain == other.subdomain && self.domain == other.domain && self.top_level_domain == other.top_level_domain
     }
 }
 
@@ -38,4 +38,36 @@ mod tests {
 
         assert_eq!(result, expected);
     }
+
+    #[test]
+    fn test_domain_equals_when_typical() {
+        let left = Domain{ subdomain: Some("one"), domain: Some("two"), top_level_domain: Some("three")};
+        let right = Domain{ subdomain: Some("one"), domain: Some("two"), top_level_domain: Some("three")};
+
+        assert_eq!(left, right);
+    }
+
+    #[test]
+    fn test_domain_not_equals_when_diff_subdomain() {
+        let left = Domain{ subdomain: Some("one"), domain: Some("two"), top_level_domain: Some("three")};
+        let right = Domain{ subdomain: Some("X"), domain: Some("two"), top_level_domain: Some("three")};
+
+        assert_ne!(left, right);
+    }
+
+    #[test]
+    fn test_domain_not_equals_when_diff_domain() {
+        let left = Domain{ subdomain: Some("one"), domain: Some("two"), top_level_domain: Some("three")};
+        let right = Domain{ subdomain: Some("one"), domain: Some("X"), top_level_domain: Some("three")};
+
+        assert_ne!(left, right);
+    }
+
+    #[test]
+    fn test_domain_not_equals_when_diff_top_level_domain() {
+        let left = Domain{ subdomain: Some("one"), domain: Some("two"), top_level_domain: Some("three")};
+        let right = Domain{ subdomain: Some("one"), domain: Some("two"), top_level_domain: Some("X")};
+
+        assert_ne!(left, right);
+    }
 }