1 files changed, 52 insertions, 0 deletions
diff --git a/tests/test_python/test_lib_config.py b/tests/test_python/test_lib_config.py
new file mode 100644
index 0000000..053462a
--- /dev/null
+++ b/tests/test_python/test_lib_config.py
@@ -0,0 +1,52 @@
+# vim:fileencoding=utf-8:noet
+from __future__ import (unicode_literals, division, absolute_import, print_function)
+
+import os
+
+from powerline.lib.config import ConfigLoader
+
+from tests.modules import TestCase
+from tests.modules.lib.fsconfig import FSTree
+
+
+FILE_ROOT = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'cfglib')
+
+
+class LoadedList(list):
+	def pop_all(self):
+		try:
+			return self[:]
+		finally:
+			self[:] = ()
+
+
+loaded = LoadedList()
+
+
+def on_load(key):
+	loaded.append(key)
+
+
+def check_file(path):
+	if os.path.exists(path):
+		return path
+	else:
+		raise IOError
+
+
+class TestLoaderCondition(TestCase):
+	def test_update_missing(self):
+		loader = ConfigLoader(run_once=True)
+		fpath = os.path.join(FILE_ROOT, 'file.json')
+		self.assertRaises(IOError, loader.load, fpath)
+		loader.register_missing(check_file, on_load, fpath)
+		loader.update()  # This line must not raise IOError
+		with FSTree({'file': {'test': 1}}, root=FILE_ROOT):
+			loader.update()
+			self.assertEqual(loader.load(fpath), {'test': 1})
+			self.assertEqual(loaded.pop_all(), [fpath])
+
+
+if __name__ == '__main__':
+	from tests.modules import main
+	main()