Add some unit tests

sanic/app.py

@@ -1563,7 +1563,7 @@ def _loop_add_task(
         else:
             task = loop.create_task(prepped, name=name)
 
-        if name and register:
+        if name and register and sys.version_info > (3, 7):
             app._task_registry[name] = task
 
         return task
@@ -1625,10 +1625,12 @@ def add_task(
     def get_task(
         self, name: str, *, raise_exception: bool = True
     ) -> Optional[Task]:
-        if sys.version_info == (3, 7):
-            raise RuntimeError(
-                "This feature is only supported on using Python 3.8+."
+        if sys.version_info < (3, 8):
+            error_logger.warning(
+                "This feature (get_task) is only supported on using "
+                "Python 3.8+."
             )
+            return
         try:
             return self._task_registry[name]
         except KeyError:
@@ -1645,10 +1647,12 @@ async def cancel_task(
         *,
         raise_exception: bool = True,
     ) -> None:
-        if sys.version_info == (3, 7):
-            raise RuntimeError(
-                "This feature is only supported on using Python 3.8+."
+        if sys.version_info < (3, 8):
+            error_logger.warning(
+                "This feature (cancel_task) is only supported on using "
+                "Python 3.8+."
             )
+            return
         task = self.get_task(name, raise_exception=raise_exception)
         if task and not task.cancelled():
             args: Tuple[str, ...] = ()
@@ -1667,10 +1671,12 @@ async def cancel_task(
                 ...
 
     def purge_tasks(self):
-        if sys.version_info == (3, 7):
-            raise RuntimeError(
-                "This feature is only supported on using Python 3.8+."
+        if sys.version_info < (3, 8):
+            error_logger.warning(
+                "This feature (purge_tasks) is only supported on using "
+                "Python 3.8+."
             )
+            return
         for task in self.tasks:
             if task.done() or task.cancelled():
                 name = task.get_name()
@@ -1683,10 +1689,12 @@ def purge_tasks(self):
     def shutdown_tasks(
         self, timeout: Optional[float] = None, increment: float = 0.1
     ):
-        if sys.version_info == (3, 7):
-            raise RuntimeError(
-                "This feature is only supported on using Python 3.8+."
+        if sys.version_info < (3, 8):
+            error_logger.warning(
+                "This feature (shutdown_tasks) is only supported on using "
+                "Python 3.8+."
             )
+            return
         for task in self.tasks:
             task.cancel()
 
@@ -1700,10 +1708,12 @@ def shutdown_tasks(
 
     @property
     def tasks(self):
-        if sys.version_info == (3, 7):
-            raise RuntimeError(
-                "This feature is only supported on using Python 3.8+."
+        if sys.version_info < (3, 8):
+            error_logger.warning(
+                "This feature (tasks) is only supported on using "
+                "Python 3.8+."
             )
+            return
         return iter(self._task_registry.values())
 
     # -------------------------------------------------------------------- #

tests/test_create_task.py

@@ -2,6 +2,7 @@
 import sys
 
 from threading import Event
+from unittest.mock import Mock
 
 import pytest
 
@@ -77,6 +78,25 @@ async def stop(app, _):
     app.run()
 
 
+def test_named_task_called(app):
+    e = Event()
+
+    async def coro():
+        e.set()
+
+    @app.route("/")
+    async def isset(request):
+        await asyncio.sleep(0.05)
+        return text(str(e.is_set()))
+
+    @app.before_server_start
+    async def setup(app, _):
+        app.add_task(coro, name="dummy_task")
+
+    request, response = app.test_client.get("/")
+    assert response.body == b"True"
+
+
 @pytest.mark.skipif(sys.version_info < (3, 8), reason="Not supported in 3.7")
 def test_create_named_task_fails_outside_app(app):
     async def dummy():