test: Add test for value greater than u128

Author: jpmckinney

tests/test_arbitrary_precision.rs

@@ -43,6 +43,19 @@ fn test_float() {
     });
 }
 
+#[test]
+fn test_greater_than_u128_max() {
+    Python::attach(|py| {
+        let json_str = r#"1.23e+100"#;
+        let value: Value = serde_json::from_str(json_str).unwrap();
+        let result = pythonize(py, &value).unwrap();
+        let number_str = result.str().unwrap().to_string();
+
+        assert!(result.is_instance_of::<pyo3::types::PyFloat>());
+        assert_eq!(number_str, "1.23e+100");
+    });
+}
+
 #[test]
 fn test_int() {
     Python::attach(|py| {