Test there is no data loss when going from toPsbt() => fromPsbt()

test/fixtures/transaction.json

@@ -2,6 +2,7 @@
   "valid": [
     {
       "description": "Standard unsigned transaction (1:2)",
+      "incomplete": true,
       "id": "af2cac1e0e33d896d9d0751d66fcb2fa54b737c7a13199281fb57e4f497bb652",
       "hash": "52b67b494f7eb51f289931a1c737b754fab2fc661d75d0d996d8330e1eac2caf",
       "hex": "0200000001268171371edff285e937adeea4b37b78000c0566cbb3ad64641713ca42171bf60000000000feffffff02d3dff505000000001976a914d0c59903c5bac2868760e90fd521a4665aa7652088ac00e1f5050000000017a9143545e6e33b832c47050f24d3eeb93c9c03948bc787b32e1300",

test/transaction.js

@@ -3,6 +3,7 @@ const assert = require('assert')
 const bscript = require('../src/script')
 const fixtures = require('./fixtures/transaction')
 const Transaction = require('..').Transaction
+const TransactionBuilder = require('..').TransactionBuilder
 
 describe('Transaction', () => {
   function fromRaw (raw, noWitness) {
@@ -128,6 +129,14 @@ describe('Transaction', () => {
           const actual = fromRaw(f.raw, true)
           assert.strictEqual(actual.toPsbt(), f.psbt)
         })
+
+        it('doesn\'t loose transaction data when cycling through toPsbt() => fromPsbt(), with: ' + f.description + ' (' + f.id + ')', () => {
+          const tx = fromRaw(f.raw, true)
+          const psbt = tx.toPsbt()
+          const txbFromPsbt = TransactionBuilder.fromPsbt(Buffer.from(psbt, 'hex'))
+          const txFromPsbt = f.incomplete ? txbFromPsbt.buildIncomplete() : txbFromPsbt.build()
+          assert.strictEqual(tx.toHex(), txFromPsbt.toHex())
+        })
       })
   })