[deprecation/fix] correctly automatically get the module in which deprecation utils are called

There was a missmatched combination of:

* the frame wasn't always correctly grabbed
* grabbing the frame in the situation of a decorator didn't make any sens, so
  switch to func.__module__
* the tests were bad and expected "[logilab.common]" while it should have been
  "[test_deprecation]" because it was there that the depreciation was declared

1 files changed, 14 insertions, 8 deletions

diff --git a/test/test_modutils.py b/test/test_modutils.py
index cd639e1..bcffe07 100644
--- a/test/test_modutils.py
+++ b/test/test_modutils.py
@@ -90,12 +90,15 @@ class get_module_part_tc(ModutilsTestCase):
     """given a dotted name return the module part of the name"""
 
     def test_knownValues_get_module_part_1(self):
-        self.assertEqual(modutils.get_module_part('logilab.common.modutils'),
-                         'logilab.common.modutils')
+        self.assertEqual(
+            modutils.get_module_part("logilab.common.modutils"), "logilab.common.modutils"
+        )
 
     def test_knownValues_get_module_part_2(self):
-        self.assertEqual(modutils.get_module_part('logilab.common.modutils.get_module_part'),
-                         'logilab.common.modutils')
+        self.assertEqual(
+            modutils.get_module_part("logilab.common.modutils.get_module_part"),
+            "logilab.common.modutils",
+        )
 
     def test_knownValues_get_module_part_3(self):
         """relative import from given file"""
@@ -120,10 +123,13 @@ class modpath_from_file_tc(ModutilsTestCase):
 
     def test_knownValues_modpath_from_file_1(self):
         with warnings.catch_warnings(record=True) as warns:
-            self.assertEqual(modutils.modpath_from_file(modutils.__file__),
-                             ['logilab', 'common', 'modutils'])
-            self.assertIn('[logilab.common] you should avoid using modpath_from_file()',
-                          [str(w.message) for w in warns])
+            self.assertEqual(
+                modutils.modpath_from_file(modutils.__file__), ["logilab", "common", "modutils"]
+            )
+            self.assertIn(
+                "[logilab.common.modutils] you should avoid using modpath_from_file()",
+                [str(w.message) for w in warns],
+            )
 
     def test_knownValues_modpath_from_file_2(self):
         self.assertEqual(modutils.modpath_from_file('unittest_modutils.py',