add test for sysctls

pytests/test_container_to_args.py

@@ -66,3 +66,35 @@ async def test_runtime(self):
                 "busybox",
             ],
         )
+
+    async def test_sysctl(self):
+        c = create_compose_mock()
+
+        cnt0 = get_minimal_container()
+        cnt1 = get_minimal_container()
+
+        cnt0["sysctls"] = [
+            "net.core.somaxconn=1024",
+            "net.ipv4.tcp_syncookies=0",
+        ]
+        cnt1["sysctls"] = {
+            "net.core.somaxconn": 1024,
+            "net.ipv4.tcp_syncookies": 0,
+        }
+
+        args0 = await container_to_args(c, cnt0)
+        args1 = await container_to_args(c, cnt1)
+        self.assertEqual(
+            args0,
+            args1,
+        )
+
+    async def test_sysctl_wrong_type(self):
+        c = create_compose_mock()
+        cnt = get_minimal_container()
+
+        # check whether wrong types are correctly rejected
+        for wrong_type in [True, 0, 0.0, "wrong", ()]:
+            with self.assertRaises(TypeError):
+                cnt["sysctls"] = wrong_type
+                await container_to_args(c, cnt)