diff --git a/tests/utils_test.rs b/tests/utils_test.rs
new file mode 100644
index 0000000..c2c3bb2
--- /dev/null
+++ b/tests/utils_test.rs
@@ -0,0 +1,16 @@
+#[cfg(test)]
+mod tests {
+    use crate::utils::author::normalize_author_identity;
+
+    #[test]
+    fn test_normalize_author_identity() {
+        let identity = normalize_author_identity("John Doe", "john@example.com");
+        assert!(identity.contains("john@example.com"));
+    }
+
+    #[test]
+    fn test_normalize_email_lowercase() {
+        let identity = normalize_author_identity("John", "JOHN@EXAMPLE.COM");
+        assert!(identity.contains("john@example.com"));
+    }
+}