diff --git a/tests/integration/src/strings.rs b/tests/integration/src/strings.rs
index c62c9ae..2e9875e 100644
--- a/tests/integration/src/strings.rs
+++ b/tests/integration/src/strings.rs
@@ -25,4 +25,21 @@ pub fn integrate(module: &mut Module) {
             Ok(())
         },
     );
+
+    module.add_function(
+        "integrate_strings_zend_string_new_persistent",
+        |_: &mut [ZVal]| -> phper::Result<()> {
+            let zs = ZString::new_persistent("persistent_hello");
+            assert_eq!(zs.to_str()?, "persistent_hello");
+
+            let zs = ZString::new_persistent([4, 5, 6]);
+            assert_eq!(zs.as_ref(), &[4, 5, 6]);
+
+            assert!(
+                ZString::new_persistent("persistent") == ZString::new_persistent(b"persistent")
+            );
+
+            Ok(())
+        },
+    );
 }
diff --git a/tests/integration/tests/php/strings.php b/tests/integration/tests/php/strings.php
index ac6745b..9eb906a 100644
--- a/tests/integration/tests/php/strings.php
+++ b/tests/integration/tests/php/strings.php
@@ -14,3 +14,4 @@
 require_once __DIR__ . '/_common.php';
 
 integrate_strings_zend_string_new();
+integrate_strings_zend_string_new_persistent();