Add testcases for jinja.

This was an attempt to get a breaking test for #127 but it seems jinja isn't
actually the issue.

qutebrowser/test/utils/test_jinja.py

@@ -0,0 +1,61 @@
+# Copyright 2014 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
+# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
+
+#
+# This file is part of qutebrowser.
+#
+# qutebrowser is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# qutebrowser is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Tests for qutebrowser.utils.jinja."""
+
+import unittest
+import unittest.mock
+
+from qutebrowser.utils import jinja
+
+
+def _read_file(path):
+    """Mocked utils.read_file."""
+    if path == 'html/test.html':
+        return """Hello {{var}}"""
+    else:
+        raise ValueError("Invalid path {}!".format(path))
+
+
+@unittest.mock.patch('qutebrowser.utils.jinja.utils.read_file')
+class JinjaTests(unittest.TestCase):
+
+    """Tests for getting template via jinja."""
+
+    def test_simple_template(self, readfile_mock):
+        """Test with a simple template."""
+        readfile_mock.side_effect = _read_file
+        template = jinja.env.get_template('test.html')
+        self.assertEqual(template.render(var='World'), "Hello World")
+
+    def test_utf8(self, readfile_mock):
+        """Test rendering with an UTF8 template.
+
+        This was an attempt to get a failing test case for #127 but it seems
+        the issue is elsewhere.
+
+        https://github.com/The-Compiler/qutebrowser/issues/127
+        """
+        readfile_mock.side_effect = _read_file
+        template = jinja.env.get_template('test.html')
+        self.assertEqual(template.render(var='\u2603'), "Hello \u2603")
+
+
+if __name__ == '__main__':
+    unittest.main()