TxBuilder: add failing test for non-zero vin inputs

test/fixtures/transaction_builder.json

@@ -63,6 +63,26 @@
             "value": 10000
           }
         ]
+      },
+      {
+        "description": "Transaction w/ non-zero vin inputs",
+        "txid": "7d9b699f26765fdfdd598223a952a6e129f8c159e2e05e911af822ee743fa745",
+        "txhex": "0100000001ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff010000006a47304402205c80bbb5125b35d5e5a8324b1336832d29a6fc004859c8a9ff6bef47ba7fc348022018612216e57a521b2c4543f1f4fd738a76814c37c074e88adfe12464fff31cf901210279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798ffffffff0110270000000000001976a914aa4d7985c57e011a8b3dd8e0e5a73aaef41629c588ac00000000",
+        "inputs": [
+          {
+            "index": 1,
+            "prevTx": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+            "privKeys": [
+              "KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgd9M7rFU73sVHnoWn"
+            ]
+          }
+        ],
+        "outputs": [
+          {
+            "script": "OP_DUP OP_HASH160 aa4d7985c57e011a8b3dd8e0e5a73aaef41629c5 OP_EQUALVERIFY OP_CHECKSIG",
+            "value": 10000
+          }
+        ]
       }
     ]
   },

test/transaction_builder.js

@@ -182,6 +182,7 @@ describe('TransactionBuilder', function() {
         var tx = txb.build()
 
         assert.equal(tx.getId(), f.txid)
+        assert.equal(tx.toHex(), f.txhex)
       })
     })