Add tests for the .provided attribute to the majority of the providers

tests/unit/providers/test_base_py2_py3.py

@@ -150,6 +150,10 @@ class ObjectProviderTests(unittest.TestCase):
     def test_is_provider(self):
         self.assertTrue(providers.is_provider(providers.Object(object())))
 
+    def test_provided_instance_provider(self):
+        provider = providers.Object(object())
+        self.assertIsInstance(provider.provided, providers.ProvidedInstance)
+
     def test_call_object_provider(self):
         obj = object()
         self.assertIs(providers.Object(obj)(), obj)
@@ -264,6 +268,9 @@ class DependencyTests(unittest.TestCase):
     def test_is_provider(self):
         self.assertTrue(providers.is_provider(self.provider))
 
+    def test_provided_instance_provider(self):
+        self.assertIsInstance(self.provider.provided, providers.ProvidedInstance)
+
     def test_call_overridden(self):
         self.provider.provided_by(providers.Factory(list))
         self.assertIsInstance(self.provider(), list)

tests/unit/providers/test_callables_py2_py3.py

@@ -22,6 +22,10 @@ class CallableTests(unittest.TestCase):
     def test_init_with_not_callable(self):
         self.assertRaises(errors.Error, providers.Callable, 123)
 
+    def test_provided_instance_provider(self):
+        provider = providers.Callable(_example)
+        self.assertIsInstance(provider.provided, providers.ProvidedInstance)
+
     def test_call(self):
         provider = providers.Callable(lambda: True)
         self.assertTrue(provider())

tests/unit/providers/test_factories_py2_py3.py

@@ -60,6 +60,10 @@ class FactoryTests(unittest.TestCase):
         with self.assertRaises(errors.Error):
             ExampleProvider(list)
 
+    def test_provided_instance_provider(self):
+        provider = providers.Factory(Example)
+        self.assertIsInstance(provider.provided, providers.ProvidedInstance)
+
     def test_call(self):
         provider = providers.Factory(Example)
 

tests/unit/providers/test_list_py2_py3.py

@@ -12,6 +12,10 @@ class ListTests(unittest.TestCase):
     def test_is_provider(self):
         self.assertTrue(providers.is_provider(providers.List()))
 
+    def test_provided_instance_provider(self):
+        provider = providers.List()
+        self.assertIsInstance(provider.provided, providers.ProvidedInstance)
+
     def test_call_with_init_positional_args(self):
         provider = providers.List('i1', 'i2')
 

tests/unit/providers/test_selector_py2_py3.py

@@ -16,6 +16,10 @@ class SelectorTests(unittest.TestCase):
     def test_is_provider(self):
         self.assertTrue(providers.is_provider(providers.Selector(self.selector)))
 
+    def test_provided_instance_provider(self):
+        provider = providers.Selector(self.selector)
+        self.assertIsInstance(provider.provided, providers.ProvidedInstance)
+
     def test_call(self):
         provider = providers.Selector(
             self.selector,

tests/unit/providers/test_singletons_py2_py3.py

@@ -62,6 +62,10 @@ class _BaseSingletonTestCase(object):
         with self.assertRaises(errors.Error):
             ExampleProvider(list)
 
+    def test_provided_instance_provider(self):
+        provider = providers.Singleton(Example)
+        self.assertIsInstance(provider.provided, providers.ProvidedInstance)
+
     def test_call(self):
         provider = self.singleton_cls(Example)