Update unit tests to compensate for the constants

Author: Ayplow

test/binding.js

@@ -43,17 +43,15 @@ describe('binding', function() {
   });
 
   describe('on unsupported environment', function() {
+    var DefaultOptions = Constants.DefaultOptions;
     describe('with an unsupported architecture', function() {
+      var arch = DefaultOptions.arch;
       beforeEach(function() {
-        Object.defineProperty(process, 'arch', {
-          value: 'foo',
-        });
+        DefaultOptions.arch = 'foo';
       });
 
       afterEach(function() {
-        Object.defineProperty(process, 'arch', {
-          value: 'x64',
-        });
+        DefaultOptions.arch = arch;
       });
 
       it('should error', function() {

test/lowlevel.js

@@ -2,7 +2,8 @@ process.env.NODESASS_COV ? require('../lib-cov') : require('../lib');
 
 var assert = require('assert'),
   sass = require('../lib/extensions'),
-  binding = require(sass.getBinaryPath());
+  Constants = require('../lib/constants'),
+  binding = require(sass.getBinaryPath(Constants.DefaultOptions));
 
 describe('lowlevel', function() {
   it('fail with options not an object', function(done) {