Add support for classes in autoparams (ivankorobkov#59)

inject/__init__.py

@@ -407,7 +407,10 @@ def sign_up(name, email, cache: RedisCache, db: DbInterface):
             pass
     """
     def autoparams_decorator(fn: Callable[..., T]) -> Callable[..., T]:
-        types = get_type_hints(fn)
+        if inspect.isclass(fn):
+            types = get_type_hints(fn.__init__)
+        else:
+            types = get_type_hints(fn)
 
         # Skip the return annotation.
         types = {name: typ for name, typ in types.items() if name != _RETURN}

test/test_functional.py

@@ -1,6 +1,7 @@
 from unittest import TestCase
 
 import inject
+from inject import autoparams
 
 
 class TestFunctional(TestCase):
@@ -57,3 +58,21 @@ def config(binder):
         assert type(inject.instance(DataFrame)) is DataFrame
         # There should not be an error when we fetch created instance
         assert type(inject.instance(DataFrame)) is DataFrame
+
+    def test_class_support_in_autoparams_programmaticaly(self):
+        class AnotherClass:
+            pass
+
+        class SomeClass:
+            def __init__(self, another_object: AnotherClass):
+                self.another_object = another_object
+
+        def config(binder):
+            binder.bind_to_constructor(SomeClass, autoparams()(SomeClass))
+            binder.bind_to_constructor(AnotherClass, autoparams()(AnotherClass))
+
+        inject.configure(config)
+
+        some_object = inject.instance(SomeClass)
+        assert type(some_object) is SomeClass
+        assert type(some_object.another_object) is AnotherClass