[tests:results] enable 'extension' and ':?' in format tests

test/results/facebook.py

@@ -150,9 +150,9 @@ __tests__ = (
     "#category": ("", "facebook", "video"),
     "#class"   : facebook.FacebookVideoExtractor,
     "#count"   : 2,
-    "#archive": False,
 
-    "filename" : "1514198129001376",
+    "filename" : str,
+    "extension": {"mp4", "m4a"},
     "id"       : "644342003942740",
     "url"      : str,
     "user_id"  : "100064860875397",

test/test_results.py

@@ -402,27 +402,31 @@ class TestPathfmt():
 
 class TestFormatter(formatter.StringFormatter):
 
-    @staticmethod
-    def _noop(_):
-        return ""
-
     def _apply_simple(self, key, fmt):
         if key == "extension" or "_parse_optional." in repr(fmt):
-            return self._noop
-
-        def wrap(obj):
-            return fmt(obj[key])
+            def wrap(obj):
+                try:
+                    return fmt(obj[key])
+                except KeyError:
+                    return ""
+        else:
+            def wrap(obj):
+                return fmt(obj[key])
         return wrap
 
     def _apply(self, key, funcs, fmt):
         if key == "extension" or "_parse_optional." in repr(fmt):
-            return self._noop
-
-        def wrap(obj):
-            obj = obj[key]
-            for func in funcs:
-                obj = func(obj)
-            return fmt(obj)
+            def wrap(obj):
+                obj = obj[key] if key in obj else ""
+                for func in funcs:
+                    obj = func(obj)
+                return fmt(obj)
+        else:
+            def wrap(obj):
+                obj = obj[key]
+                for func in funcs:
+                    obj = func(obj)
+                return fmt(obj)
         return wrap