Remove inaccessible code

sanic/app.py

@@ -1,10 +1,15 @@
-import asyncio
 import logging
 import logging.config
 import os
 import re
 
-from asyncio import CancelledError, Protocol, ensure_future, get_event_loop
+from asyncio import (
+    CancelledError,
+    Protocol,
+    ensure_future,
+    get_event_loop,
+    wait_for,
+)
 from asyncio.futures import Future
 from collections import defaultdict, deque
 from functools import partial
@@ -332,7 +337,7 @@ def event(self, event: str, timeout: Optional[Union[int, float]] = None):
         signal = self.signal_router.name_index.get(event)
         if not signal:
             raise NotFound("Could not find signal %s" % event)
-        return asyncio.wait_for(signal.ctx.event.wait(), timeout=timeout)
+        return wait_for(signal.ctx.event.wait(), timeout=timeout)
 
     def enable_websocket(self, enable=True):
         """Enable or disable the support for websocket.

sanic/blueprints.py

@@ -254,11 +254,8 @@ def event(self, event: str, timeout: Optional[Union[int, float]] = None):
                 raise NotFound("Could not find signal %s" % event)
             events.add(signal.ctx.event)
 
-        if events:
-            return asyncio.wait(
-                [event.wait() for event in events],
-                return_when=asyncio.FIRST_COMPLETED,
-                timeout=timeout,
-            )
-
-        raise NotFound("Could not find signal %s" % event)
+        return asyncio.wait(
+            [event.wait() for event in events],
+            return_when=asyncio.FIRST_COMPLETED,
+            timeout=timeout,
+        )

tests/test_signals.py

@@ -7,7 +7,7 @@
 from sanic_routing.exceptions import NotFound
 
 from sanic import Blueprint
-from sanic.exceptions import InvalidSignal
+from sanic.exceptions import InvalidSignal, SanicException
 
 
 def test_add_signal(app):
@@ -257,3 +257,17 @@ def test_event_not_exist_on_bp(app):
 
     with pytest.raises(NotFound, match="Could not find signal does.not.exist"):
         bp.event("does.not.exist")
+
+
+def test_event_on_bp_not_registered():
+    bp = Blueprint("bp")
+
+    @bp.signal("foo.bar.baz")
+    def bp_signal():
+        ...
+
+    with pytest.raises(
+        SanicException,
+        match="<Blueprint bp> has not yet been registered to an app",
+    ):
+        bp.event("foo.bar.baz")