✅ add test cases

tests/plugins/param/param_matcher.py

@@ -0,0 +1,15 @@
+from nonebot.adapters import Event
+from nonebot.matcher import Matcher
+from nonebot.params import Received, LastReceived
+
+
+async def matcher(m: Matcher) -> Matcher:
+    return m
+
+
+async def receive(e: Event = Received("test")) -> Event:
+    return e
+
+
+async def last_receive(e: Event = LastReceived()) -> Event:
+    return e