added exception test

pytube/query.py

@@ -334,8 +334,8 @@ class StreamQuery(Sequence):
         """
         if value:
             return self.fmt_streams.count(value)
-        else:
-            return len(self)
+
+        return len(self)
 
     @deprecated("This object can be treated as a list, all() is useless")
     def all(self) -> List[Stream]:  # pragma: no cover

tests/test_exceptions.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from pytube.exceptions import VideoUnavailable, RegexMatchError
+from pytube.exceptions import VideoUnavailable, RegexMatchError, LiveStreamError
 
 
 def test_video_unavailable():
@@ -15,3 +15,11 @@ def test_regex_match_error():
         raise RegexMatchError(caller="hello", pattern="*")
     except RegexMatchError as e:
         assert str(e) == "hello: could not find match for *"
+
+
+def test_live_stream_error():
+    try:
+        raise LiveStreamError(video_id="YLnZklYFe7E")
+    except LiveStreamError as e:
+        assert e.video_id == "YLnZklYFe7E"
+        assert str(e) == "YLnZklYFe7E is streaming live and cannot be loaded"