Additional tests

lib/src/lightwallet.rs

@@ -1313,11 +1313,22 @@ impl LightWallet {
         }
 
         let start_time = now();
+        if tos.len() == 0 {
+            return Err("Need at least one destination address".to_string());
+        }
+
+        // Check for duplicates in the to list
+        if tos.len() > 1 {
+            let mut to_addresses = tos.iter().map(|t| t.0.to_string()).collect::<Vec<_>>();
+            to_addresses.sort();
+            for i in 0..to_addresses.len()-1 {
+                if to_addresses[i] == to_addresses[i+1] {
+                    return Err(format!("To address {} is duplicated", to_addresses[i]));
+                }
+            }
+        }
 
         let total_value = tos.iter().map(|to| to.1).sum::<u64>();
-
-        // TODO: Check for duplicates in destination addresses
-
         println!(
             "0: Creating transaction sending {} ztoshis to {} addresses",
             total_value, tos.len()