Update tests for `res.url` and `err.url`

test/index.js

@@ -6,26 +6,29 @@ var Response = require('../');
 var res = new Response(200, {
   'Foo-Bar': 'baz-Bosh',
   'bar-foo': 'bish-Bosh'
-}, 'foo bar baz');
+}, 'foo bar baz', 'http://example.com');
 assert(res.statusCode = 200);
 assert(res.headers['foo-bar'] === 'baz-Bosh');
 assert(res.headers['bar-foo'] === 'bish-Bosh');
 assert(res.body === 'foo bar baz');
+assert(res.url === 'http://example.com');
 assert(res.getBody() === 'foo bar baz');
 
 res = new Response(404, {
   'Foo-Bar': 'baz-Bosh'
-}, 'Could not find page');
+}, 'Could not find page', 'http://example.com');
 assert(res.statusCode = 404);
 assert(res.headers['foo-bar'] === 'baz-Bosh');
 assert(res.body === 'Could not find page');
+assert(res.url === 'http://example.com');
 var errored = false;
 try {
   res.getBody();
 } catch (ex) {
   assert(ex.statusCode === 404);
   assert(ex.headers['foo-bar'] === 'baz-Bosh');
-  assert(res.body === 'Could not find page');
+  assert(ex.body === 'Could not find page');
+  assert(ex.url === 'http://example.com');
   errored = true;
 }
 if (!errored) {