use options in wallet contructor & add tests

[#26]

test/wallet.js

@@ -0,0 +1,36 @@
+var Wallet = require('../src/wallet.js')
+var assert = require('assert')
+
+describe('Wallet', function() {
+  var seed = 'crazy horse battery staple'
+
+  describe('default constructor', function() {
+    var wallet;
+    beforeEach(function() {
+      wallet = new Wallet(seed)
+    })
+
+    it('defaults to Bitcoin network', function() {
+      assert.equal(wallet.getMasterKey().network, 'Bitcoin')
+    })
+
+    it('defaults to private derivationMethod', function() {
+      assert.equal(wallet.derivationMethod, 'private')
+    })
+  })
+
+  describe('constructor options', function() {
+    var wallet;
+    beforeEach(function() {
+      wallet = new Wallet(seed, {network: 'Test', derivationMethod: 'public'})
+    })
+
+    it('uses the network if specified', function() {
+      assert.equal(wallet.getMasterKey().network, 'Test')
+    })
+
+    it('uses the derivationMethod if specified', function() {
+      assert.equal(wallet.derivationMethod, 'public')
+    })
+  })
+})