✅ add param tests

tests/plugins/param/param_arg.py

@@ -0,0 +1,14 @@
+from nonebot.adapters import Event, Message
+from nonebot.params import Arg, ArgStr, ArgEvent
+
+
+async def arg(key: Message = Arg()) -> Message:
+    return key
+
+
+async def arg_str(key: str = ArgStr()) -> str:
+    return key
+
+
+async def arg_event(key: Event = ArgEvent()) -> Event:
+    return key

tests/plugins/param/param_default.py

@@ -0,0 +1,2 @@
+async def default(value: int = 1) -> int:
+    return value

tests/plugins/param/param_exception.py

@@ -0,0 +1,6 @@
+from typing import Union
+
+
+async def exc(e: Exception, x: Union[ValueError, TypeError]) -> Exception:
+    assert e == x
+    return e