Add test

tests/unit/providers/test_factories_py2_py3.py

@@ -166,6 +166,45 @@ class FactoryTests(unittest.TestCase):
         self.assertEqual(instance.init_arg3, 33)
         self.assertEqual(instance.init_arg4, 44)
 
+    def test_call_with_deep_context_kwargs(self):
+        """`Factory` providers deep init injections example."""
+        class Regularizer:
+            def __init__(self, alpha):
+                self.alpha = alpha
+
+        class Loss:
+            def __init__(self, regularizer):
+                self.regularizer = regularizer
+
+        class ClassificationTask:
+            def __init__(self, loss):
+                self.loss = loss
+
+        class Algorithm:
+            def __init__(self, task):
+                self.task = task
+
+        algorithm_factory = providers.Factory(
+            Algorithm,
+            task=providers.Factory(
+                ClassificationTask,
+                loss=providers.Factory(
+                    Loss,
+                    regularizer=providers.Factory(
+                        Regularizer,
+                    ),
+                ),
+            ),
+        )
+
+        algorithm_1 = algorithm_factory(task__loss__regularizer__alpha=0.5)
+        algorithm_2 = algorithm_factory(task__loss__regularizer__alpha=0.7)
+        algorithm_3 = algorithm_factory(task__loss__regularizer=Regularizer(alpha=0.8))
+
+        self.assertEqual(algorithm_1.task.loss.regularizer.alpha, 0.5)
+        self.assertEqual(algorithm_2.task.loss.regularizer.alpha, 0.7)
+        self.assertEqual(algorithm_3.task.loss.regularizer.alpha, 0.8)
+
     def test_fluent_interface(self):
         provider = providers.Factory(Example) \
             .add_args(1, 2) \