add inputs as strings to force fail

test/integration/server.js

@@ -106,7 +106,7 @@ helpers.createUtxos = function(server, wallet, amounts, cb) {
         return {
           txid: helpers.randomTXID(),
           vout: Math.floor((Math.random() * 10) + 1),
-          satoshis: helpers.toSatoshi(amount),
+          satoshis: helpers.toSatoshi(amount).toString(),
           scriptPubKey: addresses[i].getScriptPubKey(wallet.m).toBuffer().toString('hex'),
           address: addresses[i++].address,
         };
@@ -664,6 +664,7 @@ describe('Copay server', function() {
 
     it('should create a tx', function(done) {
       helpers.createUtxos(server, wallet, [100, 200], function(utxos) {
+
         helpers.stubBlockExplorer(server, utxos);
         var txOpts = helpers.createProposalOpts('18PzpUFkFZE8zKWUPvfykkTxmB9oMR8qP7', 80, 'some message', TestData.copayers[0].privKey);
         server.createTx(txOpts, function(err, tx) {