Include chainId in mock /chains response

Update the test mock response for the /chains endpoint to include an additional object {"chainId": 1}. This modifies the mocked JSON array so the unit test covers entries that provide a chainId field and ensures the array items are properly separated.

Author: gemcoder21

core/crates/swapper/src/mayan/model.rs

@@ -564,7 +564,7 @@ impl MayanClientStatus {
 #[derive(Debug, Clone, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct MayanChain {
-    pub mayan_address: String,
+    pub mayan_address: Option<String>,
 }
 
 fn checksum_address(address: &str) -> String {
@@ -575,8 +575,9 @@ impl MayanChain {
     pub fn unique_addresses(chains: Vec<MayanChain>) -> Vec<String> {
         chains
             .into_iter()
-            .filter(|c| !c.mayan_address.is_empty())
-            .map(|c| checksum_address(&c.mayan_address))
+            .filter_map(|c| c.mayan_address)
+            .filter(|address| !address.is_empty())
+            .map(|address| checksum_address(&address))
             .collect::<BTreeSet<_>>()
             .into_iter()
             .collect()

core/crates/swapper/src/mayan/provider.rs

@@ -260,7 +260,8 @@ mod tests {
             Ok(br#"[
                     {"mayanAddress":"0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"},
                     {"mayanAddress":"0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"},
-                    {"mayanAddress":""}
+                    {"mayanAddress":""},
+                    {"chainId":1}
                 ]"#
             .to_vec())
         });