Beat None handling (#105)

* Adding test to show what should happen for #101
* Adding ability to differentiate between certain types of functions.
* removing inheritance from test example question

screenpy/pacing.py

@@ -4,7 +4,6 @@
 (cases), and provide the gravitas (severity) of those groupings; or markers
 for moments the Narrator should narrate.
 """
-
 import re
 from functools import wraps
 from typing import Any, Callable, Optional
@@ -13,9 +12,21 @@
 from screenpy.speech_tools import represent_prop
 
 Function = Callable[..., Any]
+
 the_narrator: Narrator = Narrator(adapters=[StdOutAdapter()])
 
 
+def function_should_log_none(func: Function) -> bool:
+    """Helper function to decide when to log return values.
+
+    Determine if function is attached to one of the protocols that allow for anything
+    to return.
+    """
+    if func.__annotations__ and "return" in func.__annotations__:
+        return func.__annotations__["return"] is not None
+    return False
+
+
 def act(title: str, gravitas: Optional[str] = None) -> Callable[[Function], Function]:
     """Decorator to mark an "act".
 
@@ -89,7 +100,7 @@ def wrapper(*args: Any, **kwargs: Any) -> Any:
             completed_line = f"{line.format(actor, **cues)}"
             with the_narrator.stating_a_beat(func, completed_line, gravitas) as n_func:
                 retval = n_func(*args, **kwargs)
-                if retval is not None:
+                if retval is not None or function_should_log_none(func):
                     aside(f"=> {represent_prop(retval)}")
             return retval
 

tests/test_pacing.py

@@ -1,4 +1,7 @@
-from screenpy import act, aside, beat, scene
+import logging
+from typing import Optional
+
+from screenpy import Actor, IsEqualTo, See, act, aside, beat, scene
 
 
 def prop():
@@ -18,6 +21,52 @@ def use(self):
         pass
 
 
+class NonesyQuestion:
+    @beat("{} examines NonesyQuestion")
+    def answered_by(self, _: Actor) -> object:
+        return None
+
+    def describe(self) -> str:
+        return "NonesyQuestion"
+
+
+class CornerCase:
+    @beat("{} examines CornerCase")
+    def answered_by(self, _: Actor) -> object:
+        self.do_not_log_me_man()
+        self.does_return_something()
+        self.no_annotations_rt_none(False)
+        self.no_annotations_rt_int(True)
+        return None
+
+    @beat("Blah!")
+    def do_not_log_me_man(self) -> None:
+        return None
+
+    @beat("Foobar...")
+    def does_return_something(self, toggle: bool = False) -> Optional[int]:
+        if toggle:
+            return 1
+        return None
+
+    # purposfully not annotated
+    @beat("Baz?")
+    def no_annotations_rt_none(self, toggle=False):
+        if toggle:
+            return 1
+        return None
+
+    # purposfully not annotated
+    @beat("Bazinga!!")
+    def no_annotations_rt_int(self, toggle=False):
+        if toggle:
+            return 1
+        return None
+
+    def describe(self) -> str:
+        return "CornerCase"
+
+
 class TestAct:
     def test_calls_narrators_method(self, mocked_narrator) -> None:
         test_act = "Test Act"
@@ -55,6 +104,36 @@ def test_interpolations(self, mocked_narrator) -> None:
         completed_line = mocked_narrator.stating_a_beat.call_args_list[0][0][1]
         assert completed_line == f"The {test_weapon} in the {test_room}!"
 
+    def test_beat_logging_none(self, Tester, caplog):
+        caplog.set_level(logging.INFO)
+        See(NonesyQuestion(), IsEqualTo(None)).perform_as(Tester)
+
+        assert [r.msg for r in caplog.records] == [
+            "Tester sees if nonesyQuestion is equal to <None>.",
+            "    Tester examines NonesyQuestion",
+            "        => <None>",
+            "    ... hoping it's equal to <None>.",
+            "        => <None>",
+        ]
+
+    def test_beat_logging_none_corner(self, Tester, caplog):
+        caplog.set_level(logging.INFO)
+        See(CornerCase(), IsEqualTo(None)).perform_as(Tester)
+
+        assert [r.msg for r in caplog.records] == [
+            "Tester sees if cornerCase is equal to <None>.",
+            "    Tester examines CornerCase",
+            "        Blah!",
+            "        Foobar...",
+            "            => <None>",
+            "        Baz?",
+            "        Bazinga!!",
+            "            => <1>",
+            "        => <None>",
+            "    ... hoping it's equal to <None>.",
+            "        => <None>",
+        ]
+
 
 class TestAside:
     def test_calls_narrators_method(self, mocked_narrator) -> None: