Cosmetic (+ add test as an extra requirements)

perf.py

@@ -40,6 +40,7 @@ def perf(chart_name, length, series):
         chart.add('s %d' % i, adapt(chart, rands[:length]))
     return chart
 
+
 if '--bench' in sys.argv:
     bench = True
 

pygal/__init__.py

@@ -106,4 +106,5 @@ class PluginImportFixer(object):
             sys.modules[name] = getattr(maps, name.split('.')[2])
         return sys.modules[name]
 
+
 sys.meta_path += [PluginImportFixer()]

pygal/_compat.py

@@ -69,6 +69,7 @@ def u(s):
         return s.decode('utf-8')
     return s
 
+
 try:
     from datetime import timezone
     utc = timezone.utc
@@ -96,6 +97,7 @@ def timestamp(x):
     else:
         return (x - datetime(1970, 1, 1, tzinfo=utc)).total_seconds()
 
+
 try:
     from urllib import quote_plus
 except ImportError:

pygal/etree.py

@@ -61,4 +61,5 @@ class Etree(object):
         self._etree = self._py_etree
         self.lxml = False
 
+
 etree = Etree()

pygal/formatters.py

@@ -101,6 +101,7 @@ class Default(Significant, IsoDateTime, Raw):
             return IsoDateTime.__call__(self, val)
         return Raw.__call__(self, val)
 
+
 # Formatters with default options
 human_readable = HumanReadable()
 significant = Significant()

pygal/interpolate.py

@@ -230,6 +230,7 @@ def trigonometric_interpolate(x, y, precision=250, **kwargs):
                 s += y[k] * p
             yield X, s
 
+
 INTERPOLATIONS = {
     'quadratic': quadratic_interpolate,
     'cubic': cubic_interpolate,

pygal/util.py

@@ -275,6 +275,7 @@ class cached_property(object):
             obj.__dict__[self.__name__] = self.getter(obj)
         return value
 
+
 css_comments = re.compile(r'/\*.*?\*/', re.MULTILINE | re.DOTALL)
 
 

setup.py

@@ -40,6 +40,12 @@ class PyTest(TestCommand):
 
 ROOT = os.path.dirname(__file__)
 
+tests_requirements = [
+    "pyquery", "flask", "cairosvg",
+    'pytest-runner', 'pytest-cov', 'pytest-flake8', 'pytest-isort',
+    'pytest'
+]
+
 # Explicitly specify the encoding of pygal/__init__.py if we're on py3.
 kwargs = {}
 if sys.version_info[0] == 3:
@@ -62,13 +68,14 @@ setup(
     scripts=["pygal_gen.py"],
     keywords=[
         "svg", "chart", "graph", "diagram", "plot", "histogram", "kiviat"],
-    tests_require=["pytest", "pyquery", "flask", "cairosvg"],
+    setup_requires=['pytest-runner'],
+    test_requires=tests_requirements,
     cmdclass={'test': PyTest},
     package_data={'pygal': ['css/*', 'graph/maps/*.svg']},
     extras_require={
         'lxml': ['lxml'],
-        'png': ['cairosvg']
-
+        'png': ['cairosvg'],
+        'test': tests_requirements
     },
     classifiers=[
         "Development Status :: 4 - Beta",