Add getLedgerHeader method

test/api-test.js

@@ -554,6 +554,11 @@ describe('RippleAPI', function() {
     assert.strictEqual(this.api.getLedgerVersion(), 8819951);
   });
 
+  it('getLedgerHeader', function() {
+    return this.api.getLedgerHeader().then(
+      _.partial(checkResult, responses.getLedgerHeader, 'getLedgerHeader'));
+  });
+
   it('ledger utils - compareTransactions', function() {
     let first = {outcome: {ledgerVersion: 1, indexInLedger: 100}};
     let second = {outcome: {ledgerVersion: 1, indexInLedger: 200}};

test/fixtures/api/responses/get-ledger-header.json

@@ -0,0 +1,14 @@
+{
+  "accepted": true,
+  "closed": true,
+  "accountHash": "EC028EC32896D537ECCA18D18BEBE6AE99709FEFF9EF72DBD3A7819E918D8B96",
+  "closeTime": 464908910,
+  "closeTimeResolution": 10,
+  "closeFlags": 0,
+  "ledgerHash": "0F7ED9F40742D8A513AE86029462B7A6768325583DF8EE21B7EC663019DD6A0F",
+  "ledgerVersion": "9038214",
+  "parentLedgerHash": "4BB9CBE44C39DC67A1BE849C7467FE1A6D1F73949EA163C38A0121A15E04FFDE",
+  "parentCloseTime": 464908900,
+  "totalDrops": "99999973964317514",
+  "transactionHash": "ECB730839EB55B1B114D5D1AD2CD9A932C35BA9AB6D3A8C2F08935EAC2BAC239"
+}

test/fixtures/api/responses/index.js

@@ -27,6 +27,7 @@ module.exports = {
   },
   getTransactions: require('./get-transactions.json'),
   getTrustlines: require('./get-trustlines.json'),
+  getLedgerHeader: require('./get-ledger-header'),
   prepareOrderCancellation: require('./prepare-order-cancellation.json'),
   prepareOrder: require('./prepare-order.json'),
   prepareOrderSell: require('./prepare-order-sell.json'),

test/fixtures/api/rippled/ledger.json

@@ -7,9 +7,11 @@
       "accepted": true,
       "account_hash": "EC028EC32896D537ECCA18D18BEBE6AE99709FEFF9EF72DBD3A7819E918D8B96",
       "close_time": 464908910,
+      "parent_close_time": 464908900,
       "close_time_human": "2014-Sep-24 21:21:50",
       "close_time_resolution": 10,
       "closed": true,
+      "close_flags": 0,
       "hash": "0F7ED9F40742D8A513AE86029462B7A6768325583DF8EE21B7EC663019DD6A0F",
       "ledger_hash": "0F7ED9F40742D8A513AE86029462B7A6768325583DF8EE21B7EC663019DD6A0F",
       "ledger_index": "9038214",