test: 更新单元测试

Author: ArgoZhang

test/UnitTest/Services/BluetoothServiceTest.cs

@@ -29,6 +29,9 @@ public async Task RequestDevice_Ok()
         var val = await device.ReadValue("battery_service", "battery_level");
         Assert.Equal([0x31], val);
 
+        var v = await device.GetBatteryValue();
+        Assert.Equal(0x31, v);
+
         var mi = device.GetType().GetMethod("OnError");
         Assert.NotNull(mi);
         mi.Invoke(device, ["test"]);