Fix test suite.

Author: hellysmile

requirements.txt

@@ -0,0 +1,36 @@
+appdirs==1.4.3
+appnope==0.1.0
+backports.shutil-get-terminal-size==1.0.0
+configparser==3.5.0
+coverage==4.3.4
+decorator==4.0.11
+enum34==1.1.6
+flake8==3.3.0
+funcsigs==1.0.2
+ipdb==0.10.2
+ipython==5.3.0
+ipython-genutils==0.2.0
+isort==4.2.5
+mccabe==0.6.1
+mock==2.0.0
+packaging==16.8
+pathlib2==2.2.1
+pexpect==4.2.1
+pickleshare==0.7.4
+pluggy==0.4.0
+prompt-toolkit==1.0.14
+ptyprocess==0.5.1
+py==1.4.33
+pycodestyle==2.3.1
+pyflakes==1.5.0
+Pygments==2.2.0
+pyparsing==2.2.0
+pytest==3.0.7
+pytest-cov==2.4.0
+scandir==1.5
+simplegeneric==0.8.1
+six==1.10.0
+tox==2.6.0
+traitlets==4.3.2
+virtualenv==15.1.0
+wcwidth==0.1.7

tox.ini

@@ -11,6 +11,7 @@ deps =
     isort
     pytest
     pytest-codecov
+    mock
 commands =
     flake8 --show-source fake_useragent
     isort --check-only -rc fake_useragent --diff