Changed location of the testing-related requirements

Thanks @movermeyer

pint/compat/__init__.py

@@ -51,15 +51,6 @@ else:
 
     long_type = long
 
-if sys.version_info < (2, 7):
-    try:
-        import unittest2 as unittest
-    except ImportError:
-        raise Exception("Testing Pint in Python 2.6 requires package 'unittest2'")
-else:
-    import unittest
-
-
 try:
     from collections import Chainmap
 except ImportError:

pint/testsuite/__init__.py

@@ -9,10 +9,11 @@ import sys
 
 from contextlib import contextmanager
 
-from pint.compat import ndarray, unittest, np
+from pint.compat import ndarray, np
 
 from pint import logger, UnitRegistry
 from pint.quantity import _Quantity
+from pint.testsuite.compat import unittest
 from pint.testsuite.helpers import PintOutputChecker
 from logging.handlers import BufferingHandler
 

pint/testsuite/compat/__init__.py

@@ -0,0 +1,9 @@
+import sys
+
+if sys.version_info < (2, 7):
+    try:
+        import unittest2 as unittest
+    except ImportError:
+        raise Exception("Testing Pint in Python 2.6 requires package 'unittest2'")
+else:
+    import unittest

pint/testsuite/helpers.py

@@ -7,7 +7,8 @@ import doctest
 from distutils.version import StrictVersion
 import re
 
-from pint.compat import unittest, HAS_NUMPY, HAS_UNCERTAINTIES, NUMPY_VER, PYTHON3
+from pint.compat import HAS_NUMPY, HAS_UNCERTAINTIES, NUMPY_VER, PYTHON3
+from pint.testsuite.compat import unittest
 
 
 def requires_numpy18():

pint/testsuite/parameterized.py

@@ -28,10 +28,7 @@
 #        def test_eval(self, input, expected_output):
 #            self.assertEqual(eval(input), expected_output)
 
-try:
-    import unittest2 as unittest
-except ImportError:  # pragma: no cover
-    import unittest
+from pint.testsuite.compat import unittest
 
 from functools import wraps
 import collections

pint/testsuite/test_issues.py

@@ -9,9 +9,10 @@ from pint import UnitRegistry
 from pint.unit import UnitsContainer
 from pint.util import ParserHelper
 
-from pint.compat import np, unittest, long_type
+from pint.compat import np, long_type
 from pint.errors import UndefinedUnitError
 from pint.testsuite import QuantityTestCase, helpers
+from pint.testsuite.compat import unittest
 
 
 class TestIssues(QuantityTestCase):

pint/testsuite/test_numpy.py

@@ -8,6 +8,7 @@ import operator as op
 from pint import DimensionalityError, set_application_registry
 from pint.compat import np, unittest
 from pint.testsuite import QuantityTestCase, helpers
+from pint.testsuite.compat import unittest
 from pint.testsuite.test_umath import TestUFuncs
 
 

pint/testsuite/test_pint_eval.py

@@ -2,8 +2,9 @@
 
 from __future__ import division, unicode_literals, print_function, absolute_import
 
-from pint.compat import unittest, tokenizer
+from pint.compat import tokenizer
 from pint.pint_eval import build_eval_tree
+from pint.testsuite.compat import unittest
 
 
 class TestPintEval(unittest.TestCase):

setup.py

@@ -37,6 +37,7 @@ setup(
     author_email='hernan.grecco@gmail.com',
     url='https://github.com/hgrecco/pint',
     test_suite='pint.testsuite.testsuite',
+    tests_require=["unittest2 ; python_version < '2.7'"],
     zip_safe=True,
     packages=['pint'],
     package_data={