Use unittest2.skipIf decorator for some of the tests.

compressor/tests/tests.py

@@ -1,6 +1,8 @@
 import os
 import re
 import socket
+from unittest2 import skipIf
+
 from BeautifulSoup import BeautifulSoup
 
 try:
@@ -134,7 +136,6 @@ class CompressorTestCase(TestCase):
         finally:
             settings.COMPRESS_OUTPUT_DIR = old_output_dir
 
-if lxml:
 class LxmlCompressorTestCase(CompressorTestCase):
 
     def test_css_split(self):
@@ -154,8 +155,9 @@ if lxml:
 
     def tearDown(self):
         settings.COMPRESS_PARSER = self.old_parser
+LxmlCompressorTestCase = skipIf(lxml is None, 'lxml not found')(LxmlCompressorTestCase)
+
 
-if html5lib:
 class Html5LibCompressorTesCase(CompressorTestCase):
 
     def test_css_split(self):
@@ -183,6 +185,8 @@ if html5lib:
 
     def tearDown(self):
         settings.COMPRESS_PARSER = self.old_parser
+Html5LibCompressorTesCase = skipIf(html5lib is None, 'html5lib not found')(Html5LibCompressorTesCase)
+
 
 class CssAbsolutizingTestCase(TestCase):
     def setUp(self):
@@ -454,10 +458,7 @@ class OfflineGenerationTestCase(TestCase):
         settings.COMPRESS_OFFLINE_CONTEXT = self._old_offline_context
 
 
-if find_command(settings.COMPRESS_CSSTIDY_BINARY):
-
 class CssTidyTestCase(TestCase):
-
     def test_tidy(self):
         content = """
 /* Some comment */
@@ -468,3 +469,8 @@ font,th,td,p{
         from compressor.filters.csstidy import CSSTidyFilter
         self.assertEqual(
             "font,th,td,p{color:#000;}", CSSTidyFilter(content).output())
+
+CssTidyTestCase = skipIf(
+    find_command(settings.COMPRESS_CSSTIDY_BINARY) is None,
+    'CSStidy binary %r not found' % settings.COMPRESS_CSSTIDY_BINARY
+)(CssTidyTestCase)