Added tests for get_class_method

chamber/utils/__init__.py

@@ -7,14 +7,18 @@
 
 
 def remove_accent(string_with_diacritics):
-    "Removes a diacritics from a given string"
+    """
+    Removes a diacritics from a given string"
+    """
     return unicodedata.normalize('NFKD', string_with_diacritics).encode('ASCII', 'ignore').decode('ASCII')
 
 
 def get_class_method(cls_or_inst, method_name):
-    cls = cls_or_inst
-    if not isinstance(cls, type):
-        cls = cls_or_inst.__class__
+    """
+    Returns a method from a given class or instance. When the method doest not exist, it returns `None`. Also works with
+    properties and cached properties.
+    """
+    cls = cls_or_inst if isinstance(cls_or_inst, type) else cls_or_inst.__class__
     meth = getattr(cls, method_name, None)
     if isinstance(meth, property):
         meth = meth.fget

example/dj/apps/test_chamber/tests/utils/__init__.py

@@ -4,14 +4,43 @@
 from .datastructures import * # NOQA
 from .decorators import * # NOQA
 
+from django.utils.functional import cached_property
 from django.test import TestCase
 
-from chamber.utils import remove_accent
+from chamber.utils import remove_accent, get_class_method
 
+from germanium.anotations import data_provider
 from germanium.tools import assert_equal
 
 
+class TestClass(object):
+
+    def method(self):
+        pass
+
+    @property
+    def property_method(self):
+        pass
+
+    @cached_property
+    def cached_property_method(self):
+        pass
+
+
 class UtilsTestCase(TestCase):
 
     def test_should_remove_accent_from_string(self):
         assert_equal('escrzyaie', remove_accent('ěščřžýáíé'))
+
+    classes_and_method_names = [
+        [TestClass.method, TestClass, 'method'],
+        [TestClass.method, TestClass(), 'method'],
+        [TestClass.property_method.fget, TestClass, 'property_method'],
+        [TestClass.property_method.fget, TestClass(), 'property_method'],
+        [TestClass.cached_property_method.func, TestClass, 'cached_property_method'],
+        [TestClass.cached_property_method.func, TestClass(), 'cached_property_method'],
+    ]
+
+    @data_provider(classes_and_method_names)
+    def test_should_return_class_method(self, expected_method, cls_or_inst, method_name):
+        assert_equal(expected_method, get_class_method(cls_or_inst, method_name))