From 5efb213a9eab6ac3c1526ae999946409769fd599 Mon Sep 17 00:00:00 2001
From: Juda Kaleta <juda.kaleta@gmail.com>
Date: Thu, 22 Aug 2013 16:09:14 +0200
Subject: [PATCH] Add tests for utils.import_by_path

---
 embed_video/tests/tests_utils.py | 35 ++++++++++++++++++++++++++++++++
 embed_video/utils.py             | 35 ++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 embed_video/tests/tests_utils.py
 create mode 100644 embed_video/utils.py

diff --git a/embed_video/tests/tests_utils.py b/embed_video/tests/tests_utils.py
new file mode 100644
index 0000000..85e8a31
--- /dev/null
+++ b/embed_video/tests/tests_utils.py
@@ -0,0 +1,35 @@
+import sys
+from unittest import TestCase
+
+from django.core.exceptions import ImproperlyConfigured
+
+from embed_video.utils import import_by_path
+
+
+class ModuleImportTestCase(TestCase):
+    """
+    Taken from Django:
+
+    https://github.com/django/django/blob/master/tests/utils_tests/test_module_loading.py
+    """
+
+    def test_incorrect_path(self):
+        self.assertRaises(ImproperlyConfigured, import_by_path, 'wrongpath')
+
+    def test_incorrect_classname(self):
+        self.assertRaises(ImproperlyConfigured, import_by_path,
+                          'embed_video.foo')
+
+    def test_import_by_path(self):
+        cls = import_by_path(
+            'embed_video.utils.import_by_path')
+        self.assertEqual(cls, import_by_path)
+
+        # Test exceptions raised
+        for path in ('no_dots_in_path', 'unexistent.path',
+                'utils_tests.unexistent'):
+            self.assertRaises(ImproperlyConfigured, import_by_path, path)
+
+        with self.assertRaises(ImproperlyConfigured) as cm:
+            import_by_path('unexistent.module.path', error_prefix="Foo")
+        self.assertTrue(str(cm.exception).startswith('Foo'))
diff --git a/embed_video/utils.py b/embed_video/utils.py
new file mode 100644
index 0000000..3572816
--- /dev/null
+++ b/embed_video/utils.py
@@ -0,0 +1,35 @@
+from importlib import import_module
+
+from django.core.exceptions import ImproperlyConfigured
+
+
+def import_by_path(dotted_path, error_prefix=''):
+    """
+    Import a dotted module path and return the attribute/class designated by
+    the last name in the path. Raise ImproperlyConfigured if something goes
+    wrong.
+
+    .. warning::
+        .. deprecated:: Django 1.6
+
+        Function :py:func:`django.utils.module_loading.import_by_path` has
+        been added in Django 1.6.
+    """
+    try:
+        module_path, class_name = dotted_path.rsplit('.', 1)
+    except ValueError:
+        raise ImproperlyConfigured("%s%s doesn't look like a module path" % (
+            error_prefix, dotted_path))
+    try:
+        module = import_module(module_path)
+    except ImportError as e:
+        msg = '%sError importing module %s: "%s"' % (
+            error_prefix, module_path, e)
+        raise ImproperlyConfigured(msg)
+    try:
+        attr = getattr(module, class_name)
+    except AttributeError:
+        raise ImproperlyConfigured('%sModule "%s" does not define a "%s" \
+                                   attribute/class' %
+                                   (error_prefix, module_path, class_name))
+    return attr