rename unknown chain error

Author: shekhirin

Diff for: ethers-etherscan/src/contract.rs

@@ -222,7 +222,7 @@ impl Client {
     ///
     /// # #[tokio::main]
     /// # async fn main() {
-    ///     let client = Client::new(Chain::Mainnet, "API_KEY")?;
+    ///     let client = Client::new(Chain::Mainnet, "API_KEY").unwrap();
     ///     let abi = client
     ///         .contract_abi("0xBB9bc244D798123fDe783fCc1C72d3Bb8C189413".parse().unwrap())
     ///         .await.unwrap();
@@ -241,7 +241,7 @@ impl Client {
     ///
     /// # #[tokio::main]
     /// # async fn main() {
-    ///     let client = Client::new(Chain::Mainnet, "API_KEY")?;
+    ///     let client = Client::new(Chain::Mainnet, "API_KEY").unwrap();
     ///     let meta = client
     ///         .contract_source_code("0xBB9bc244D798123fDe783fCc1C72d3Bb8C189413".parse().unwrap())
     ///         .await.unwrap();

Diff for: ethers-etherscan/src/errors.rs

@@ -3,8 +3,8 @@ use std::env::VarError;
 
 #[derive(Debug, thiserror::Error)]
 pub enum EtherscanError {
-    #[error("unknown chain {0}")]
-    UnknownChain(Chain),
+    #[error("chain {0} not supported")]
+    ChainNotSupported(Chain),
     #[error("contract execution call failed: {0}")]
     ExecutionFailed(String),
     #[error("tx receipt failed")]

Diff for: ethers-etherscan/src/lib.rs

@@ -42,7 +42,7 @@ impl Client {
                     Url::parse(&format!("https://{}.etherscan.io", chain_name)),
                 )
             }
-            chain => return Err(EtherscanError::UnknownChain(chain)),
+            chain => return Err(EtherscanError::ChainNotSupported(chain)),
         };
 
         Ok(Self {
@@ -155,10 +155,10 @@ mod tests {
     use ethers_core::types::Chain;
 
     #[test]
-    fn unknown_chain() {
+    fn chain_not_supported() {
         let err = Client::new_from_env(Chain::XDai).unwrap_err();
 
-        assert!(matches!(err, EtherscanError::UnknownChain(_)));
-        assert_eq!(err.to_string(), "unknown chain XDai");
+        assert!(matches!(err, EtherscanError::ChainNotSupported(_)));
+        assert_eq!(err.to_string(), "chain XDai not supported");
     }
 }