diff --git a/pytest_pyodide/runner.py b/pytest_pyodide/runner.py
index b949a47..ae9e208 100644
--- a/pytest_pyodide/runner.py
+++ b/pytest_pyodide/runner.py
@@ -590,14 +590,11 @@ def clean_logs(self):
 
     def run_js_inner(self, code, check_code):
         check_code = ""
-        wrapped = """
-            let result = await (async () => {{ {} }})();
-            {}
+        wrapped = f"""
+            let result = await (async () => {{ {code} }})();
+            {check_code}
             return result;
-        """.format(
-            code,
-            check_code,
-        )
+        """
         from uuid import uuid4
 
         cmd_id = str(uuid4())
diff --git a/tests/test_decorator.py b/tests/test_decorator.py
index fddacd8..a7c1f05 100644
--- a/tests/test_decorator.py
+++ b/tests/test_decorator.py
@@ -255,7 +255,6 @@ def assert_get_handle(selenium, d, key, value):
 @run_in_pyodide
 def returns_handle(selenium):
     import __main__
-
     from pytest_pyodide.decorator import PyodideHandle
 
     o = {"a": 6}