App.xaml

<ui:RunnerApplication
    x:Class="Plugin.BluetoothLE.Uwp.Tests.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Plugin.BluetoothLE.Uwp.Tests"
    xmlns:ui="using:Xunit.Runners.UI"
    RequestedTheme="Light">

</ui:RunnerApplication>