use included mock, use extras_require for coverage.

pasn1.py

@@ -562,7 +562,7 @@ class TestCode(unittest.TestCase):
 			self.assertRaises(ValueError, loads, bytes.fromhex(v))
 
 	def test_invalid_floats(self):
-		import mock
+		from unittest import mock
 		with mock.patch('math.frexp', return_value=(.87232, 1 << 23)):
 			self.assertRaises(ValueError, dumps, 1.1)
 

requirements.txt

@@ -1,2 +1,3 @@
-coverage
-mock
+-e .
+
+-e .[dev]

setup.py

@@ -17,4 +17,7 @@ setup(name='pasn1',
           'Programming Language :: Python',
           'Topic :: Software Development :: Libraries :: Python Modules',
           ],
+     extras_require = {
+         'dev': [ 'coverage' ],
+     },
      )