Test createXpub is serialised correctly

test/unit.js

@@ -1,6 +1,19 @@
 import test from 'ava';
 import createXpub from '..';
 
+const testParams = {
+	depth: 3,
+	childnum: 2147483648,
+	chainCode: '84cf7d9029cdd9fcadbb3717fd92ec0db7d7d9787c57c13c08fc887c389b566b',
+	publicKey: '048bcdcf59f046b13f1eb35b608d1211265fde8cc44fc7a5a7f7107c5cf238095328a0e0d7be17c7d3e48490e8c6433af6d2c3dacc687f3fecaa98a3d05f17de97'
+};
+const expectedXpub = 'xpub6CgMcBZk66ayM9ESh7QtBmRKJbsa6rBeBH2k4aQZQJGossryP5r2N2nQS4hBMG1wb8igPoH53bxtzTBaeMqJkbu8bxsih1gGkoAn23Nr8VP';
+
 test('createXpub is exported', t => {
 	t.not(createXpub, undefined);
 });
+
+test('createXpub is serialised correctly', t => {
+	const xpub = createXpub(testParams);
+	t.is(xpub, expectedXpub);
+});