diff --git a/tests/test_generators.py b/tests/test_generators.py
index 6b714082..8a839ba1 100644
--- a/tests/test_generators.py
+++ b/tests/test_generators.py
@@ -8,6 +8,11 @@ from codecs import open
 from tempfile import mkdtemp
 from shutil import rmtree
 
+try:
+    import webassets
+except ImportError:
+    webassets = None
+
 from pelican import Pelican
 from pelican.generators import ArticlesGenerator, PagesGenerator, \
     TemplatePagesGenerator
@@ -243,6 +248,7 @@ class TestTemplatePagesGenerator(unittest.TestCase):
             self.assertEquals(output_file.read(), 'foo: bar')
 
 
+@unittest.skipUnless(webassets, "webassets isn't installed")
 @skipIfNoExecutable(['scss', '-v'])
 @skipIfNoExecutable(['cssmin', '--version'])
 class TestWebAssets(unittest.TestCase):
@@ -250,28 +256,52 @@ class TestWebAssets(unittest.TestCase):
     scss style.scss style.ref.css
     """
 
-    def setUp(self):
-        self.temp_path = mkdtemp()
-        self.theme_dir = os.path.join(CUR_DIR, 'themes', 'assets')
+    @classmethod
+    def setUpClass(cls):
+        """Run pelican with two settings (absolute and relative urls)."""
 
-        self.settings = read_settings(override={
+        cls.theme_dir = os.path.join(CUR_DIR, 'themes', 'assets')
+
+        cls.temp_path = mkdtemp()
+        cls.settings = read_settings(override={
             'PATH': os.path.join(CUR_DIR, 'content', 'TestCategory'),
-            'OUTPUT_PATH': self.temp_path,
+            'OUTPUT_PATH': cls.temp_path,
             'PLUGINS': ['pelican.plugins.assets', ],
-            'THEME': self.theme_dir,
+            'THEME': cls.theme_dir,
         })
-        pelican = Pelican(settings=self.settings)
+        pelican = Pelican(settings=cls.settings)
         pelican.run()
 
-        self.css_ref = open(os.path.join(self.theme_dir, 'static', 'css',
-                                         'style.min.css')).read()
-        self.version = hashlib.md5(self.css_ref).hexdigest()[0:8]
+        # run Pelican a second time with absolute urls
+        cls.temp_path2 = mkdtemp()
+        cls.settings2 = read_settings(override={
+            'PATH': os.path.join(CUR_DIR, 'content', 'TestCategory'),
+            'OUTPUT_PATH': cls.temp_path2,
+            'PLUGINS': ['pelican.plugins.assets', ],
+            'THEME': cls.theme_dir,
+            'RELATIVE_URLS': False,
+            'SITEURL': 'http://localhost'
+        })
+        pelican2 = Pelican(settings=cls.settings2)
+        pelican2.run()
 
-    def tearDown(self):
-        rmtree(self.temp_path)
+        cls.css_ref = open(os.path.join(cls.theme_dir, 'static', 'css',
+                                        'style.min.css')).read()
+        cls.version = hashlib.md5(cls.css_ref).hexdigest()[0:8]
+
+    @classmethod
+    def tearDownClass(cls):
+        rmtree(cls.temp_path)
+        rmtree(cls.temp_path2)
+
+    def test_jinja2_ext(self):
+        """Test that the Jinja2 extension was correctly added."""
+
+        from webassets.ext.jinja2 import AssetsExtension
+        self.assertIn(AssetsExtension, self.settings['JINJA_EXTENSIONS'])
 
     def test_compilation(self):
-        "Compare the compiled css with the reference"
+        """Compare the compiled css with the reference."""
 
         gen_file = os.path.join(self.temp_path, 'theme', 'gen',
                                 'style.{0}.min.css'.format(self.version))
@@ -280,10 +310,29 @@ class TestWebAssets(unittest.TestCase):
         css_new = open(gen_file).read()
         self.assertEqual(css_new, self.css_ref)
 
-    def test_template(self):
-        "Look in the output index.html file for the link tag"
+    def check_link_tag(self, css_file, html_file):
+        """Check the presence of `css_file` in `html_file`."""
 
-        link_tag = '<link rel="stylesheet" ' + \
-                   'href="theme/gen/style.{0}.min.css">'.format(self.version)
-        html = open(os.path.join(self.temp_path, 'index.html')).read()
+        link_tag = '<link rel="stylesheet" href="{css_file}">'.\
+                   format(css_file=css_file)
+        html = open(html_file).read()
         self.assertRegexpMatches(html, link_tag)
+
+    def test_template(self):
+        """Look in the output index.html file for the link tag."""
+
+        css_file = 'theme/gen/style.{0}.min.css'.format(self.version)
+        html_files = ['index.html', 'archives.html',
+                      'this-is-an-article-with-category.html']
+        for f in html_files:
+            self.check_link_tag(css_file, os.path.join(self.temp_path, f))
+
+    def test_absolute_url(self):
+        """Look in the output index.html file for the link tag with abs url."""
+
+        css_file = 'http://localhost/theme/gen/style.{0}.min.css'.\
+                   format(self.version)
+        html_files = ['index.html', 'archives.html',
+                      'this-is-an-article-with-category.html']
+        for f in html_files:
+            self.check_link_tag(css_file, os.path.join(self.temp_path2, f))