test: add unit test for KubernetesClusterInfo creation

Author: dervoeti

crates/stackable-operator/src/utils/cluster_info.rs

@@ -46,3 +46,29 @@ impl KubernetesClusterInfo {
         Self { cluster_domain }
     }
 }
+
+#[cfg(test)]
+mod test {
+    use rstest::rstest;
+
+    use super::*;
+
+    #[rstest]
+    #[case(None, KUBERNETES_CLUSTER_DOMAIN_DEFAULT)]
+    #[case(Some("example.com".parse().unwrap()), "example.com.")]
+    fn test_kubernetes_cluster_info_creation(
+        #[case] kubernetes_cluster_domain: Option<DomainName>,
+        #[case] expected_cluster_domain: &str,
+    ) {
+        let opts = KubernetesClusterInfoOpts {
+            kubernetes_cluster_domain,
+        };
+
+        let cluster_info = KubernetesClusterInfo::new(&opts);
+
+        assert_eq!(
+            cluster_info.cluster_domain,
+            DomainName::from_str(expected_cluster_domain).unwrap()
+        );
+    }
+}