When checking for transaction serialization errors, check the output amount before checking fee errors. Added a test for it and also improved buildSkipTest by specifying which error to expect and using it for some tests where it wasn't used yet.

lib/transaction/transaction.js

@@ -192,10 +192,10 @@ Transaction.prototype.getSerializationError = function(opts) {
   opts = opts || {};
 
   return this._isInvalidSatoshis() ||
+      this._hasMoreOutputThanInput(opts) ||
       this._hasFeeError(opts) ||
       this._hasDustOutputs(opts) ||
-      this._isMissingSignatures(opts) ||
-      this._hasMoreOutputThanInput(opts);
+      this._isMissingSignatures(opts);
 };
 
 Transaction.prototype._isInvalidSatoshis = function() {

test/transaction/transaction.js

@@ -385,22 +385,36 @@ describe('Transaction', function() {
         return transaction.serialize();
       }).to.throw(errors.Transaction.FeeError.Different);
     });
+    it('checks output amount before fee errors', function() {
+      var transaction = new Transaction();
+      transaction.from(simpleUtxoWith1BTC);
+      transaction
+        .to(toAddress, 10000000000000)
+        .change(changeAddress)
+        .fee(5);
+
+      expect(function() {
+        return transaction.serialize();
+      }).to.throw(errors.Transaction.InvalidOutputAmountSum);
+    });
     describe('skipping checks', function() {
-      var buildSkipTest = function(builder, check) {
+      var buildSkipTest = function(builder, check, expectedError, opts) {
         return function() {
           var transaction = new Transaction();
           transaction.from(simpleUtxoWith1BTC);
           builder(transaction);
 
-          var options = {};
+          var options = opts || {};
           options[check] = true;
 
           expect(function() {
             return transaction.serialize(options);
           }).not.to.throw();
+
+          options[check] = false;
           expect(function() {
-            return transaction.serialize();
-          }).to.throw();
+            return transaction.serialize(options);
+          }).to.throw(expectedError);
         };
       };
       it('can skip the check for too much fee', buildSkipTest(
@@ -409,54 +423,38 @@ describe('Transaction', function() {
             .fee(50000000)
             .change(changeAddress)
             .sign(privateKey);
-        }, 'disableLargeFees'));
+        }, 'disableLargeFees', errors.Transaction.FeeError.TooLarge));
       it('can skip the check for a fee that is too small', buildSkipTest(
         function(transaction) {
           return transaction
             .fee(1)
             .change(changeAddress)
             .sign(privateKey);
-        }, 'disableSmallFees'));
+        }, 'disableSmallFees', errors.Transaction.FeeError.TooSmall));
       it('can skip the check that prevents dust outputs', buildSkipTest(
         function(transaction) {
           return transaction
             .to(toAddress, 100)
             .change(changeAddress)
             .sign(privateKey);
-        }, 'disableDustOutputs'));
-      it('can skip the check that prevents unsigned outputs', function() {
-        var transaction = new Transaction();
-        transaction.from(simpleUtxoWith1BTC);
-        transaction.to(toAddress, 10000);
-        transaction.change(changeAddress);
-        var options = {};
-        options.disableIsFullySigned = true;
-        expect(function() {
-          return transaction.serialize(options);
-        }).not.to.throw(errors.Transaction.MissingSignatures);
-        expect(function() {
-          return transaction.serialize();
-        }).to.throw(errors.Transaction.MissingSignatures);
-      });
-      it('can skip the check that avoids spending more bitcoins than the inputs for a transaction', function() {
-        var transaction = new Transaction();
-        transaction.from(simpleUtxoWith1BTC);
-        transaction.to(toAddress, 10000000000000);
-        transaction.change(changeAddress);
-        expect(function() {
-          return transaction.serialize({
-            disableSmallFees: true,
-            disableIsFullySigned: true,
-            disableMoreOutputThanInput: true
-          });
-        }).not.to.throw(errors.Transaction.InvalidOutputAmountSum);
-        expect(function() {
-          return transaction.serialize({
-            disableIsFullySigned: true,
-            disableSmallFees: true
-          });
-        }).to.throw(errors.Transaction.InvalidOutputAmountSum);
-      });
+        }, 'disableDustOutputs', errors.Transaction.DustOutputs));
+      it('can skip the check that prevents unsigned outputs', buildSkipTest(
+        function(transaction) {
+          return transaction
+            .to(toAddress, 10000)
+            .change(changeAddress);
+        }, 'disableIsFullySigned', errors.Transaction.UnableToVerifySignature));
+      it('can skip the check that avoids spending more bitcoins than the inputs for a transaction', buildSkipTest(
+        function(transaction) {
+          return transaction
+            .to(toAddress, 10000000000000)
+            .change(changeAddress);
+          }, 'disableMoreOutputThanInput',
+          errors.Transaction.InvalidOutputAmountSum,
+          {
+            'disableSmallFees': true,
+            'disableIsFullySigned': true
+          }));
     });
   });