From 82296d9fed27c0a9cfb6e547d6fc6eef872dfd4a Mon Sep 17 00:00:00 2001
From: Roman Mogilatov <rmogilatov@gmail.com>
Date: Fri, 11 Nov 2016 12:11:56 +0200
Subject: [PATCH] Add tests for base providers

---
 src/dependency_injector/providers/base.pyx |  2 -
 tests/unit/providers/test_base.py          | 96 ++++++++++++++++++++++
 2 files changed, 96 insertions(+), 2 deletions(-)

diff --git a/src/dependency_injector/providers/base.pyx b/src/dependency_injector/providers/base.pyx
index a3e70854..1d072a5a 100644
--- a/src/dependency_injector/providers/base.pyx
+++ b/src/dependency_injector/providers/base.pyx
@@ -179,8 +179,6 @@ cdef class Provider(object):
     @cython.wraparound(False)
     cpdef object _call_last_overriding(self, tuple args, dict kwargs):
         """Call last overriding provider and return result."""
-        if self.__overridden_len == 0:
-            return None
         return  <object>self.__overridden[self.__overridden_len - 1](*args,
                                                                      **kwargs)
 
diff --git a/tests/unit/providers/test_base.py b/tests/unit/providers/test_base.py
index e475ceb6..e7ca8167 100644
--- a/tests/unit/providers/test_base.py
+++ b/tests/unit/providers/test_base.py
@@ -80,6 +80,38 @@ def test_reset_override(self):
 
         self.assertEqual(self.provider.overridden, tuple())
 
+    def test_deepcopy(self):
+        provider = providers.Provider()
+
+        provider_copy = providers.deepcopy(provider)
+
+        self.assertIsNot(provider, provider_copy)
+        self.assertIsInstance(provider, providers.Provider)
+
+    def test_deepcopy_from_memo(self):
+        provider = providers.Provider()
+        provider_copy_memo = providers.Provider()
+
+        provider_copy = providers.deepcopy(
+            provider, memo={id(provider): provider_copy_memo})
+
+        self.assertIs(provider_copy, provider_copy_memo)
+
+    def test_deepcopy_overridden(self):
+        provider = providers.Provider()
+        overriding_provider = providers.Provider()
+
+        provider.override(overriding_provider)
+
+        provider_copy = providers.deepcopy(provider)
+        overriding_provider_copy = provider_copy.overridden[0]
+
+        self.assertIsNot(provider, provider_copy)
+        self.assertIsInstance(provider, providers.Provider)
+
+        self.assertIsNot(overriding_provider, overriding_provider_copy)
+        self.assertIsInstance(overriding_provider_copy, providers.Provider)
+
     def test_repr(self):
         self.assertEqual(repr(self.provider),
                          '<dependency_injector.providers.base.'
@@ -102,6 +134,38 @@ def test_call_overridden_object_provider(self):
         provider.override(providers.Object(obj2))
         self.assertIs(provider(), obj2)
 
+    def test_deepcopy(self):
+        provider = providers.Object(1)
+
+        provider_copy = providers.deepcopy(provider)
+
+        self.assertIsNot(provider, provider_copy)
+        self.assertIsInstance(provider, providers.Object)
+
+    def test_deepcopy_from_memo(self):
+        provider = providers.Object(1)
+        provider_copy_memo = providers.Provider()
+
+        provider_copy = providers.deepcopy(
+            provider, memo={id(provider): provider_copy_memo})
+
+        self.assertIs(provider_copy, provider_copy_memo)
+
+    def test_deepcopy_overridden(self):
+        provider = providers.Object(1)
+        overriding_provider = providers.Provider()
+
+        provider.override(overriding_provider)
+
+        provider_copy = providers.deepcopy(provider)
+        overriding_provider_copy = provider_copy.overridden[0]
+
+        self.assertIsNot(provider, provider_copy)
+        self.assertIsInstance(provider, providers.Object)
+
+        self.assertIsNot(overriding_provider, overriding_provider_copy)
+        self.assertIsInstance(overriding_provider_copy, providers.Provider)
+
     def test_repr(self):
         some_object = object()
         provider = providers.Object(some_object)
@@ -161,6 +225,38 @@ def test_call_overridden_but_not_instance_of(self):
     def test_call_not_overridden(self):
         self.assertRaises(errors.Error, self.provider)
 
+    def test_deepcopy(self):
+        provider = providers.ExternalDependency(int)
+
+        provider_copy = providers.deepcopy(provider)
+
+        self.assertIsNot(provider, provider_copy)
+        self.assertIsInstance(provider, providers.ExternalDependency)
+
+    def test_deepcopy_from_memo(self):
+        provider = providers.ExternalDependency(int)
+        provider_copy_memo = providers.Provider()
+
+        provider_copy = providers.deepcopy(
+            provider, memo={id(provider): provider_copy_memo})
+
+        self.assertIs(provider_copy, provider_copy_memo)
+
+    def test_deepcopy_overridden(self):
+        provider = providers.ExternalDependency(int)
+        overriding_provider = providers.Provider()
+
+        provider.override(overriding_provider)
+
+        provider_copy = providers.deepcopy(provider)
+        overriding_provider_copy = provider_copy.overridden[0]
+
+        self.assertIsNot(provider, provider_copy)
+        self.assertIsInstance(provider, providers.ExternalDependency)
+
+        self.assertIsNot(overriding_provider, overriding_provider_copy)
+        self.assertIsInstance(overriding_provider_copy, providers.Provider)
+
     def test_repr(self):
         self.assertEqual(repr(self.provider),
                          '<dependency_injector.providers.base.'