Use the event_loop fixture for tests that need one

Without this, many tests fail in Python 3.14.0a2 because
`asyncio.get_event_loop()` no longer automatically starts an event loop,
instead raising a `RuntimeError` if there is no current event loop. See
https://docs.python.org/dev/library/asyncio-eventloop.html#asyncio.get_event_loop,
https://docs.python.org/dev/whatsnew/3.14.html#id3, and
python/cpython#126353.

For documentation on the fixture, see
https://pytest-asyncio.readthedocs.io/en/latest/reference/fixtures/#event-loop.

tests/test_service.py

@@ -9,7 +9,7 @@ class TestService:
     @pytest.mark.parametrize(
         ('rate_limit', 'period'), ((1, 0.5), (3, 1.0), (100, 1.5))
     )
-    def test_service(self, rate_limit: int, period: float):
+    def test_service(self, rate_limit: int, period: float, event_loop):
         s = Service(rate_limit, period)
 
         async def request(value: float):
@@ -22,7 +22,7 @@ async def request(value: float):
     @pytest.mark.parametrize(
         ('max_simultaneous',), ((1,), (3,), (100,))
     )
-    def test_service_simultaneous(self, max_simultaneous: int):
+    def test_service_simultaneous(self, max_simultaneous: int, event_loop):
         s = ServiceSimultaneous(max_simultaneous)
 
         async def request(value: float):

tests/test_throttler.py

@@ -21,7 +21,7 @@ def test_exceptions(self, rate_limit: int, period: float):
         tuple(product((1, 3, 5), (0.5, 1.0, 1.5), (3, 5, 7))) +
         tuple(product((100, 1000), (0.5, 1.0, 1.5), (10, 1000)))
     )
-    def test_via_service(self, rate_limit: int, period: float, count: int):
+    def test_via_service(self, rate_limit: int, period: float, count: int, event_loop):
         s = Service(rate_limit, period)
 
         @throttle(rate_limit, period)

tests/test_throttler_simultaneous.py

@@ -10,7 +10,7 @@ class TestThrottlerSimultaneous:
     @pytest.mark.parametrize(
         ('max_simultaneous', 'count'), ((1, 10), (3, 10), (100, 500))
     )
-    def test_via_service_simultaneous(self, max_simultaneous: int, count: int):
+    def test_via_service_simultaneous(self, max_simultaneous: int, count: int, event_loop):
         s = ServiceSimultaneous(max_simultaneous)
 
         @throttle_simultaneous(max_simultaneous)