Add tests for Pelican and pelican_import tool

Added tests to ensure that:
- THEME and deprecated *_DIR settings result in the expected configurations
- Post headers are formatted correctly in both Markdown and reStructuredText
- Files specified in IGNORE_FILES setting are properly ignored
- Generator.get_files()'s `paths` argument is backwards-compatible with strings

pelican/tests/test_generators.py

@@ -34,12 +34,17 @@ class TestGenerator(unittest.TestCase):
 
 
     def test_include_path(self):
+        self.settings['IGNORE_FILES'] = {'ignored1.rst', 'ignored2.rst'}
+
         filename = os.path.join(CUR_DIR, 'content', 'article.rst')
         include_path = self.generator._include_path
         self.assertTrue(include_path(filename))
         self.assertTrue(include_path(filename, extensions=('rst',)))
         self.assertFalse(include_path(filename, extensions=('md',)))
 
+        ignored_file = os.path.join(CUR_DIR, 'content', 'ignored1.rst')
+        self.assertFalse(include_path(ignored_file))
+
     def test_get_files_exclude(self):
         """Test that Generator.get_files() properly excludes directories.
         """
@@ -55,6 +60,13 @@ class TestGenerator(unittest.TestCase):
         self.assertFalse(expected_files - found_files,
             "get_files() failed to find one or more files")
 
+        # Test string as `paths` argument rather than list
+        filepaths = generator.get_files(paths='maindir')
+        found_files = {os.path.basename(f) for f in filepaths}
+        expected_files = {'maindir.md', 'subdir.md'}
+        self.assertFalse(expected_files - found_files,
+            "get_files() failed to find one or more files")
+
         filepaths = generator.get_files(paths=[''], exclude=['maindir'])
         found_files = {os.path.basename(f) for f in filepaths}
         self.assertNotIn('maindir.md', found_files,
@@ -317,6 +329,14 @@ class TestArticlesGenerator(unittest.TestCase):
                                  settings,
                                  blog=True, dates=dates)
 
+    def test_nonexistent_template(self):
+        """Attempt to load a non-existent template"""
+        settings = get_settings(filenames={})
+        generator = ArticlesGenerator(
+            context=settings, settings=settings,
+            path=None, theme=settings['THEME'], output_path=None)
+        self.assertRaises(Exception, generator.get_template, "not_a_template")
+
     def test_generate_authors(self):
         """Check authors generation."""
         authors = [author.name for author, _ in self.generator.authors]