add inputAmount and outputAmount to docs

docs/transaction.md

@@ -24,6 +24,8 @@ var transaction = new Transaction()
     .sign(privkeySet)     // Signs all the inputs it can
 ```
 
+You can obtain the input and output total amounts of the transaction in satoshis by accessing the fields `inputAmount` and `outputAmount`.
+
 Now, this could just be serialized to hexadecimal ASCII values (`transaction.serialize()`) and sent over to the bitcoind reference client.
 
 ```bash
@@ -102,7 +104,7 @@ Some methods related to adding inputs are:
   - `from(utxos)`: same as above, but passing in an array of Unspent Outputs.
   - `from(utxo, publicKeys, threshold)`: add an input that spends a UTXO with a P2SH output for a Multisig script. The `publicKeys` argument is an array of public keys, and `threshold` is the number of required signatures in the Multisig script.
 * `addInput`: Performs a series of checks on an input and appends it to the end of the `input` vector and updates the amount of incoming bitcoins of the transaction.
-* `uncheckedAddInput`: adds an input to the end of the `input` vector and updates the `_inputAmount` without performing any checks.
+* `uncheckedAddInput`: adds an input to the end of the `input` vector and updates the `inputAmount` without performing any checks.
 
 ### PublicKeyHashInput
 
@@ -131,7 +133,7 @@ The following methods are used to manage signatures for a transaction:
 
 Outputs can be added by:
 
-* The `addOutput(output)` method, which pushes an `Output` to the end of the `outputs` property and updates the `_outputAmount`. It also clears signatures (as the hash of the transaction may have changed) and updates the change output.
+* The `addOutput(output)` method, which pushes an `Output` to the end of the `outputs` property and updates the `outputAmount` field. It also clears signatures (as the hash of the transaction may have changed) and updates the change output.
 * The `to(address, amount)` method, that adds an output with the script that corresponds to the given address. Builds an output and calls the `addOutput` method.
 * Specifying a [change address](#Fee_calculation)
 

test/transaction/input/input.js

@@ -64,13 +64,13 @@ describe('Transaction.Input', function() {
         input.toString();
       }).to.throw('Need a script to create an input');
     });
-    it('fromJSON', function() {
+    it('fromJSON should work', function() {
       var input = Input.fromJSON(coinbaseJSON);
       var otherInput = Input.fromJSON(otherJSON);
       should.exist(input);
       should.exist(otherInput);
     });
-    it('fromObject', function() {
+    it('fromObject should work', function() {
       var input = Input.fromJSON(coinbaseJSON);
       var obj = input.toObject();
       obj.script = new Buffer(obj.script, 'hex');
@@ -80,7 +80,7 @@ describe('Transaction.Input', function() {
     });
   });
 
-  it('_estimateSize', function() {
+  it('_estimateSize returns correct size', function() {
     var input = new Input(output);
     input._estimateSize().should.equal(66);
   });

test/transaction/output.js

@@ -42,15 +42,6 @@ describe('Output', function() {
     expectEqualOutputs(output, deserialized);
   });
 
-  it('roundtrips to/from object', function() {
-    var newOutput = new Output({
-      satoshis: 50,
-      script: new Script().add(0)
-    });
-    var otherOutput = new Output(newOutput.toObject());
-    expectEqualOutputs(newOutput, otherOutput);
-  });
-
   it('can set a script from a buffer', function() {
     var newOutput = Output(output);
     newOutput.setScript(Script().add(0).toBuffer());
@@ -67,19 +58,32 @@ describe('Output', function() {
       'cabd5ac1ca10646e23fd5f51508 21 0x038282263212c609d9ea2a6e3e172de23' +
       '8d8c39cabd5ac1ca10646e23fd5f51508 OP_2 OP_CHECKMULTISIG OP_EQUAL')
   });
+
   it('toBufferWriter', function() {
     output2.toBufferWriter().toBuffer().toString('hex')
       .should.equal('00ab904100000000485215038282263212c609d9ea2a6e3e172de2' +
         '38d8c39cabd5ac1ca10646e23fd5f5150815038282263212c609d9ea2a6e3e172d' +
         'e238d8c39cabd5ac1ca10646e23fd5f5150852ae87');
   });
-  it('to/from JSON', function() {
+
+  it('roundtrips to/from object', function() {
+    var newOutput = new Output({
+      satoshis: 50,
+      script: new Script().add(0)
+    });
+    var otherOutput = new Output(newOutput.toObject());
+    expectEqualOutputs(newOutput, otherOutput);
+  });
+
+  it('roundtrips to/from JSON', function() {
     var json = output2.toJSON();
     var o3 = new Output(json);
     o3.toJSON().should.equal(json);
   });
+
   it('setScript fails with invalid input', function() {
     var out = new Output(output2.toJSON());
     out.setScript.bind(out, 45).should.throw('Invalid argument type: script');
   });
+
 });