Add Provider.last_overriding read-only property

docs/main/changelog.rst

@@ -11,6 +11,12 @@ Development version
 -------------------
 - No features.
 
+3.4.4
+-----
+- Add ``Provider.last_overriding`` read-only property that points to last 
+  overriding provider, if any. If target provider is not overridden, ``None``
+  would be returned.
+
 3.4.3
 -----
 - Update doc block for ``Provider.overriding_lock`` attribute.

src/dependency_injector/providers.pyx

@@ -129,6 +129,14 @@ cdef class Provider(object):
         with self.__overriding_lock:
             return self.__overridden
 
+    @property
+    def last_overriding(self):
+        """Return last overriding provider.
+
+        If provider is not overridden, then None is returned.
+        """
+        return self.__last_overriding
+
     def override(self, provider):
         """Override provider with another provider.
 

tests/unit/providers/test_base.py

@@ -36,6 +36,7 @@ class ProviderTests(unittest.TestCase):
         overriding_provider = providers.Provider()
         self.provider.override(overriding_provider)
         self.assertTrue(self.provider.overridden)
+        self.assertIs(self.provider.last_overriding, overriding_provider)
 
     def test_overriding_context(self):
         overriding_provider = providers.Provider()
@@ -59,12 +60,15 @@ class ProviderTests(unittest.TestCase):
         self.provider.override(overriding_provider2)
 
         self.assertIs(self.provider.overridden[-1], overriding_provider2)
+        self.assertIs(self.provider.last_overriding, overriding_provider2)
 
         self.provider.reset_last_overriding()
         self.assertIs(self.provider.overridden[-1], overriding_provider1)
+        self.assertIs(self.provider.last_overriding, overriding_provider1)
 
         self.provider.reset_last_overriding()
         self.assertFalse(self.provider.overridden)
+        self.assertIsNone(self.provider.last_overriding)
 
     def test_reset_last_overriding_of_not_overridden_provider(self):
         self.assertRaises(errors.Error, self.provider.reset_last_overriding)