> For the complete documentation index, see [llms.txt](https://doc-hub.xcavate.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc-hub.xcavate.io/protocol/nft-marketplace/fuzzer/how-to-extend-the-fuzzer.md).

# How to Extend the Fuzzer

To add additional coverage:

1. Add test case generators:

   ```
   pub fn generate_high_value_listing() -> Listing {
       // Max value, long duration, uncommon currency
   }
   ```
2. Add targeted fuzz test:

   ```
   #[test]
   fn test_fuzz_high_value_listing() {
       let listing = generate_high_value_listing();
       assert_ok!(NFTMarketplace::list(origin, listing));
   }
   ```
3. Loop over randomized sequences:

   ```
   for _ in 0..100 {
       let action = generate_random_market_action();
       let _ = apply_random_market_action(origin.clone(), action);
   }
   ```