Using rest operator instead of shift on array.

lib/tests/2wp.js

@@ -192,13 +192,13 @@ const execute = (description, getRskHost) => {
 
         const finalRskRecipientBalances = await getFinalRskRecipientBalances(sendersInfo);
 
-        // Retrieving and removing the first rsk recipient balance since only the first sender should have the amount locked.
-        const firstRskRecipientBalance = finalRskRecipientBalances.shift();
+        // Extracting the first rsk recipient balance since only the first sender should have the total amount in rsk.
+        const [ firstRskRecipientBalance, ...restOfFinalRskRecipientBalances ] = finalRskRecipientBalances;
         expect(Number(firstRskRecipientBalance)).to.be.equal(Number(btcToWeis(totalAmountToFed)));
 
         // The other rsk recipients should have their balances unchanged
-        for(let i = 0; i < finalRskRecipientBalances.length; i++) {
-          const actualFinalBalance = Number(finalRskRecipientBalances[i]);
+        for(let i = 0; i < restOfFinalRskRecipientBalances.length; i++) {
+          const actualFinalBalance = Number(restOfFinalRskRecipientBalances[i]);
           const expectedFinalBalance = 0;
           expect(actualFinalBalance).to.be.equal(expectedFinalBalance);
         }