Fix token handling in SAC tests (#828)

Author: tupui

docs/build/guides/conventions/stellar-asset-contract.mdx

@@ -63,16 +63,15 @@ Soroban Rust SDK provides an easy way to instantiate a Stellar Asset Contract to
 
 use soroban_sdk::testutils::Address as _;
 use soroban_sdk::{token, Address, Env};
-use token::TokenClient;
-use token::StellarAssetClient;
+use token::{StellarAssetClient, TokenClient};
 
 #[test]
 fn test() {
     let e = Env::default();
     e.mock_all_auths();
 
-    let issuer = Address::random();
-    let distributer = Address::random();
+    let issuer = Address::generate(&e);
+    let distributor = Address::generate(&e);
 
     let token_address = e.register_stellar_asset_contract(issuer.clone());
 
@@ -86,7 +85,7 @@ fn test() {
     // E.g. to mint 1 TOKEN, we need to use 1*1e7 in the mint function.
     let genesis_amount: i128 = 1_000_000_000 * 10_000_000;
 
-    token_sac.mint(&issuer, &distributer, &genesis_amount);
+    token_sac.mint(&distributor, &genesis_amount);
 
     assert_eq!(token.balance(&distributor), genesis_amount);
 }