fix(token): enable erc20 mod on tests

contracts/token/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "token"
-categories = ["cryptography", "algorithms", "no-std", "wasm"]
-description = "Cryptography Utilities"
+categories = ["no-std", "wasm"]
+description = "Token Standards for Stylus"
 edition.workspace = true
 keywords.workspace = true
 license.workspace = true

contracts/token/src/lib.rs

@@ -7,7 +7,7 @@ extern crate alloc;
 #[global_allocator]
 static ALLOC: mini_alloc::MiniAlloc = mini_alloc::MiniAlloc::INIT;
 
-#[cfg(erc20)]
+#[cfg(any(test, erc20))]
 pub mod erc20;
 
 #[cfg(not(any(test, target_arch = "wasm32-unknown-unknown")))]

lib/wavm-shims/src/lib.rs

@@ -7,6 +7,21 @@ use tiny_keccak::{Hasher, Keccak};
 pub const WORD_BYTES: usize = 32;
 pub type Bytes32 = [u8; WORD_BYTES];
 
+#[no_mangle]
+pub extern "C" fn native_keccak256(
+    bytes: *const u8,
+    len: usize,
+    output: *mut u8,
+) {
+    let mut hasher = Keccak::v256();
+
+    let data = unsafe { slice::from_raw_parts(bytes, len) };
+    hasher.update(data);
+
+    let output = unsafe { slice::from_raw_parts_mut(output, WORD_BYTES) };
+    hasher.finalize(output);
+}
+
 pub static STORAGE: Lazy<Mutex<HashMap<Bytes32, Bytes32>>> =
     Lazy::new(|| Mutex::new(HashMap::new()));