Use base_dir as the project root directory

tests/test_app.py

@@ -1,4 +1,5 @@
 import json
+import os.path
 import random
 import threading
 import tornado.websocket
@@ -8,10 +9,10 @@ import webssh.handler as handler
 from tornado.testing import AsyncHTTPTestCase
 from tornado.httpclient import HTTPError
 from tornado.options import options
-from webssh.main import make_app, make_handlers
-from webssh.settings import get_app_settings, max_body_size
 from tests.sshserver import run_ssh_server, banner
-from tests.utils import encode_multipart_formdata
+from tests.utils import encode_multipart_formdata, read_file
+from webssh.main import make_app, make_handlers
+from webssh.settings import get_app_settings, max_body_size, base_dir
 
 
 handler.DELAY = 0.1
@@ -52,9 +53,6 @@ class TestApp(AsyncHTTPTestCase):
         cls.running.pop()
         print('='*20)
 
-    def read_privatekey(self, filename):
-        return open(filename, 'rb').read().decode('utf-8')
-
     def get_httpserver_options(self):
         options = super(TestApp, self).get_httpserver_options()
         options.update(max_body_size=max_body_size)
@@ -126,7 +124,7 @@ class TestApp(AsyncHTTPTestCase):
         response = yield client.fetch(url)
         self.assertEqual(response.code, 200)
 
-        privatekey = self.read_privatekey('tests/user_rsa_key')
+        privatekey = read_file(os.path.join(base_dir, 'tests', 'user_rsa_key'))
         files = [('privatekey', 'user_rsa_key', privatekey)]
         content_type, body = encode_multipart_formdata(self.body_dict.items(),
                                                        files)
@@ -154,7 +152,7 @@ class TestApp(AsyncHTTPTestCase):
         response = yield client.fetch(url)
         self.assertEqual(response.code, 200)
 
-        privatekey = self.read_privatekey('tests/user_rsa_key')
+        privatekey = read_file(os.path.join(base_dir, 'tests', 'user_rsa_key'))
         privatekey = privatekey[:100] + u'bad' + privatekey[100:]
         files = [('privatekey', 'user_rsa_key', privatekey)]
         content_type, body = encode_multipart_formdata(self.body_dict.items(),