we don't package tinycss (and it's *very* deprecated),
so it's easier to just skip these tests

diff --git a/setup.py b/setup.py
index 0f63a21..b713398 100644
--- a/setup.py
+++ b/setup.py
@@ -15,7 +15,7 @@ install_requires = \
 ['sphinx >= 1.8']
 
 extras_require = \
-{'test': ['html5lib', 'tinycss']}
+{'test': ['html5lib']}
 
 entry_points = \
 {'sphinx.html_themes': ['quark = quark_sphinx_theme']}
diff --git a/test/test_theme.py b/test/test_theme.py
index aa9543d..6910aae 100644
--- a/test/test_theme.py
+++ b/test/test_theme.py
@@ -23,9 +23,6 @@ class TestThemeEntrypoint(SphinxBuildFixture, unittest.TestCase):
 class TestThemeDefaults(SphinxBuildFixture, unittest.TestCase):
     source_dir = testdoc_theme
 
-    def test_quark_css(self):
-        self.assertSphinxCSSValid('quark.css')
-
     def _nav_elems(self, doc):
         self.assertHasElement(doc, './/table[@class="nav-sidebar"]')
         self.assertHasElement(doc, './/table[@class="navbar navbar-top"]')
@@ -63,9 +60,6 @@ class TestThemeExtraCss(SphinxBuildFixture, unittest.TestCase):
                                               '_static/extra2.css'
     }
 
-    def test_quark_css(self):
-        self.assertSphinxCSSValid('quark.css')
-
     @with_document('contents')
     def test_contents_css_files(self, doc):
         extra_css = {
@@ -83,9 +77,6 @@ class TestThemeNoSidebar(SphinxBuildFixture, unittest.TestCase):
         'html_theme_options.nosidebar': True,
     }
 
-    def test_quark_css(self):
-        self.assertSphinxCSSValid('quark.css')
-
     def _nav_elems(self, doc):
         self.assertNotElement(doc, './/table[@class="nav-sidebar"]')
         self.assertHasElement(doc, './/table[@class="navbar navbar-top"]')
@@ -151,9 +142,6 @@ class TestThemeAllSettingsUnset(SphinxBuildFixture, unittest.TestCase):
     ]
     config = {'html_theme_options.%s' % s: '' for s in _SETTINGS}
 
-    def test_quark_css(self):
-        self.assertSphinxCSSValid('quark.css')
-
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/test/util.py b/test/util.py
index 86b3d43..b59d474 100644
--- a/test/util.py
+++ b/test/util.py
@@ -6,7 +6,6 @@ import sys
 import tempfile
 
 import html5lib
-import tinycss
 from sphinx.cmd.build import main
 
 
@@ -31,24 +30,6 @@ def capture_output():
         yield stdout
 
 
-def get_css_errors(filename_or_fobj, encoding=None):
-    if hasattr(filename_or_fobj, 'read'):
-        source = filename_or_fobj.read()
-    else:
-        with open(filename_or_fobj, 'r', encoding=encoding) as fobj:
-            source = fobj.read()
-    parser = tinycss.make_parser()
-    css = parser.parse_stylesheet(source)
-    lines = source.split('\n')
-    errors = []
-    for err in css.errors:
-        try:
-            errors.append('  %s [%s]\n' % (err, lines[err.line - 1]))
-        except IndexError:
-            errors.append('  %s\n' % err)
-    return errors
-
-
 def run_sphinx(source_dir, build_dir, builder='html', extra_config={}, tags=[]):
     args = ['-b', builder, '-N']
     for k, v in extra_config.items():
@@ -104,14 +85,6 @@ class SphinxBuildFixture:
     def assertNotElement(self, doc, path):
         self.assertHasElement(doc, path, 0)
 
-    def assertCSSValid(self, filename_or_fobj, encoding=None):
-        errors = get_css_errors(filename_or_fobj, encoding)
-        self.assertEqual(len(errors), 0, 'CSS errors:\n' + ''.join(errors))
-
-    def assertSphinxCSSValid(self, basename, encoding='utf-8'):
-        self.assertCSSValid(os.path.join(self.build_dir, '_static', basename),
-                            encoding=encoding)
-
 
 def with_document(docname):
     def wrap1(func):