diff --git a/test/__init__.py b/test/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/test/test_age_restriction.py b/test/test_age_restriction.py
index 943f9a315..ec3e30572 100644
--- a/test/test_age_restriction.py
+++ b/test/test_age_restriction.py
@@ -8,7 +8,7 @@ import os
 sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 from youtube_dl import YoutubeDL
-from helper import try_rm
+from .helper import try_rm
 
 
 def _download_restricted(url, filename, age):
diff --git a/test/test_all_urls.py b/test/test_all_urls.py
index ff1c86efe..b28ad000b 100644
--- a/test/test_all_urls.py
+++ b/test/test_all_urls.py
@@ -8,7 +8,7 @@ import os
 sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 from youtube_dl.extractor import YoutubeIE, YoutubePlaylistIE, YoutubeChannelIE, JustinTVIE, gen_extractors
-from helper import get_testcases
+from .helper import get_testcases
 
 class TestAllURLsMatching(unittest.TestCase):
     def setUp(self):
diff --git a/test/test_dailymotion_subtitles.py b/test/test_dailymotion_subtitles.py
index ed2ad311d..e655d280d 100644
--- a/test/test_dailymotion_subtitles.py
+++ b/test/test_dailymotion_subtitles.py
@@ -10,7 +10,7 @@ sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 from youtube_dl.extractor import DailymotionIE
 from youtube_dl.utils import *
-from helper import FakeYDL
+from .helper import FakeYDL
 
 md5 = lambda s: hashlib.md5(s.encode('utf-8')).hexdigest()
 
diff --git a/test/test_download.py b/test/test_download.py
index fdf59bb5c..68da4d984 100644
--- a/test/test_download.py
+++ b/test/test_download.py
@@ -37,8 +37,8 @@ def _file_md5(fn):
     with open(fn, 'rb') as f:
         return hashlib.md5(f.read()).hexdigest()
 
-import helper  # Set up remaining global configuration
-from helper import get_testcases, try_rm
+import test.helper as helper  # Set up remaining global configuration
+from .helper import get_testcases, try_rm
 defs = get_testcases()
 
 with io.open(PARAMETERS_FILE, encoding='utf-8') as pf:
diff --git a/test/test_playlists.py b/test/test_playlists.py
index de8bd298a..108a4d63b 100644
--- a/test/test_playlists.py
+++ b/test/test_playlists.py
@@ -20,7 +20,7 @@ from youtube_dl.extractor import (
 )
 from youtube_dl.utils import *
 
-from helper import FakeYDL
+from .helper import FakeYDL
 
 class TestPlaylists(unittest.TestCase):
     def assertIsPlaylist(self, info):
diff --git a/test/test_youtube_lists.py b/test/test_youtube_lists.py
index 53e65816d..0b5c79030 100644
--- a/test/test_youtube_lists.py
+++ b/test/test_youtube_lists.py
@@ -11,7 +11,7 @@ sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 from youtube_dl.extractor import YoutubeUserIE, YoutubePlaylistIE, YoutubeIE, YoutubeChannelIE, YoutubeShowIE
 from youtube_dl.utils import *
 
-from helper import FakeYDL
+from .helper import FakeYDL
 
 class TestYoutubeLists(unittest.TestCase):
     def assertIsPlaylist(self,info):
diff --git a/test/test_youtube_subtitles.py b/test/test_youtube_subtitles.py
index f9b0c1ad0..07850385e 100644
--- a/test/test_youtube_subtitles.py
+++ b/test/test_youtube_subtitles.py
@@ -10,7 +10,7 @@ sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 from youtube_dl.extractor import YoutubeIE
 from youtube_dl.utils import *
-from helper import FakeYDL
+from .helper import FakeYDL
 
 md5 = lambda s: hashlib.md5(s.encode('utf-8')).hexdigest()
 
diff --git a/tox.ini b/tox.ini
index 53b461fdb..ed01e3386 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,8 @@
 [tox]
 envlist = py26,py27,py33
 [testenv]
-deps = nose
-commands = nosetests --with-coverage --cover-package=youtube_dl --cover-html --verbose test
+deps =
+   nose
+   coverage
+commands = nosetests --verbose {posargs:test}  # --with-coverage --cover-package=youtube_dl --cover-html
+                                               # test.test_download:TestDownload.test_NowVideo