Move import to top

tests/test_arguments.py

@@ -1,10 +1,11 @@
 from subprocess import CalledProcessError
 import unittest
+import subprocess
 
-class FirstTestClass(unittest.TestCase):
+
+class ArgumentTestClass(unittest.TestCase):
 
   def test_argument_required(self):
-    import subprocess
     with self.assertRaises(CalledProcessError):
       subprocess.check_output(['python', 'manga_up'])