Test less generator

tests/test_generators.py

@@ -2,10 +2,12 @@
 
 from mock import MagicMock
 import os
+import re
+import subprocess
 
-from pelican.generators import ArticlesGenerator
+from pelican.generators import ArticlesGenerator, LessCSSGenerator
 from pelican.settings import _DEFAULT_CONFIG
-from .support import unittest
+from .support import unittest, temporary_folder, skipIfNoExecutable
 
 CUR_DIR = os.path.dirname(__file__)
 
@@ -46,3 +48,50 @@ class TestArticlesGenerator(unittest.TestCase):
             elif relfilepath == "article_without_category.rst":
                 self.assertEquals(article.category.name, 'Default')
 
+
+class TestLessCSSGenerator(unittest.TestCase):
+
+    LESS_CONTENT = """
+        @color: #4D926F;
+
+        #header {
+          color: @color;
+        }
+        h2 {
+          color: @color;
+        }
+    """
+
+    @skipIfNoExecutable('lessc')
+    def test_less_compiler(self):
+
+        settings = _DEFAULT_CONFIG.copy()
+        settings['STATIC_PATHS'] = ['static']
+        settings['LESS_GENERATOR'] = True
+        settings['LESS_COMPILER'] = 'lessc'
+
+        # we'll nest here for py < 2.7 compat
+        with temporary_folder() as temp_content:
+            with temporary_folder() as temp_output:
+                generator = LessCSSGenerator(None, settings, temp_content,
+                                    _DEFAULT_CONFIG['THEME'], temp_output, None)
+
+                # create a dummy less file
+                less_dir = os.path.join(temp_content, 'static', 'css')
+                less_filename = os.path.join(less_dir, 'test.less')
+
+                less_output = os.path.join(temp_output, 'static', 'css',
+                                    'test.css')
+
+                os.makedirs(less_dir)
+                with open(less_filename, 'w') as less_file:
+                    less_file.write(self.LESS_CONTENT)
+
+                generator.generate_output()
+
+                # we have the file ?
+                self.assertTrue(os.path.exists(less_output))
+
+                # was it compiled ?
+                self.assertIsNotNone(re.search(r'^\s+color:\s*#4D926F;$',
+                    open(less_output).read(), re.MULTILINE | re.IGNORECASE))