feat: implement callable return value #3

src/_primitives/callable.py

@@ -1,6 +1,12 @@
 class Callable:
     """An object appropriate to fake functions and methods."""
 
+    def __init__(self, *args):
+        if args:
+            self.return_value = args[0]
+        else:
+            self.return_value = None
+
     def __call__(self):
         """Return predefined value."""
-        pass
+        return self.return_value

tests/test_callable.py

@@ -11,3 +11,9 @@ def test_empty_callable_object():
     """
     func = Callable()
     assert func() is None
+
+
+def test_callable_object_return_value():
+    """`Callable` object should return value passed to it constructor."""
+    func = Callable("Hello, John")
+    assert func() == "Hello, John"