Fix setsockopt signature to match standard socket API

mocket/socket.py

@@ -225,20 +225,26 @@ def gettimeout(self) -> float | None:
         """
         return self._timeout
 
-    def setsockopt(self, family: int, type: int, proto: int) -> None:
-        """Set socket options.
+    def setsockopt(
+        self,
+        level: int,
+        optname: int,
+        value: int | bytes | None,
+        optlen: int | None = None,
+    ) -> None:
+        """Set socket option.
 
         Args:
-            family: Address family
-            type: Socket type
-            proto: Protocol number
+            level: Socket option level (e.g., socket.SOL_SOCKET)
+            optname: Socket option name (e.g., socket.SO_REUSEADDR)
+            value: Option value as an integer or bytes, or None when optlen is provided
+            optlen: Option length (used when value is None)
         """
-        self._family = family
-        self._type = type
-        self._proto = proto
-
         if self._true_socket:
-            self._true_socket.setsockopt(family, type, proto)
+            if optlen is not None:
+                self._true_socket.setsockopt(level, optname, value, optlen)
+            else:
+                self._true_socket.setsockopt(level, optname, value)
 
     def settimeout(self, timeout: float | None) -> None:
         """Set the socket timeout.

tests/test_socket.py

@@ -1,4 +1,6 @@
 import socket
+import struct
+from unittest.mock import MagicMock
 
 import pytest
 
@@ -126,3 +128,22 @@ def test_recvfrom_into():
     assert nbytes == len(test_data)
     assert buf[:nbytes] == test_data
     assert addr == sock._address
+
+
+def test_setsockopt_without_optlen():
+    sock = MocketSocket(socket.AF_INET, socket.SOCK_STREAM)
+    sock._true_socket = MagicMock()
+    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    sock._true_socket.setsockopt.assert_called_once_with(
+        socket.SOL_SOCKET, socket.SO_REUSEADDR, 1
+    )
+
+
+def test_setsockopt_with_optlen():
+    sock = MocketSocket(socket.AF_INET, socket.SOCK_STREAM)
+    sock._true_socket = MagicMock()
+    linger_value = struct.pack("ii", 1, 5)
+    sock.setsockopt(socket.SOL_SOCKET, socket.SO_LINGER, linger_value, len(linger_value))
+    sock._true_socket.setsockopt.assert_called_once_with(
+        socket.SOL_SOCKET, socket.SO_LINGER, linger_value, len(linger_value)
+    )