AppiumTests.cs

private static AndroidDriver<AndroidElement> _driver;

[ClassInitialize]
public static void ClassInitialize(TestContext context)
{
    string testAppPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Resources", "ApiDemos-debug.apk");
    var desiredCaps = new AppiumOptions();
    desiredCaps.AddAdditionalCapability(MobileCapabilityType.DeviceName, "Android_Accelerated_x86_Oreo");
    desiredCaps.AddAdditionalCapability(AndroidMobileCapabilityType.AppPackage, "io.appium.android.apis");
    desiredCaps.AddAdditionalCapability(MobileCapabilityType.PlatformName, "Android");
    desiredCaps.AddAdditionalCapability(MobileCapabilityType.PlatformVersion, "7.1");
    desiredCaps.AddAdditionalCapability(AndroidMobileCapabilityType.AppActivity, ".ApiDemos");
    desiredCaps.AddAdditionalCapability(MobileCapabilityType.App, testAppPath);

    _driver = new AndroidDriver<AndroidElement>(new Uri("http://127.0.0.1:4723/wd/hub"), desiredCaps);
    _driver.CloseApp();
}

[TestInitialize]
public void TestInitialize()
{
    if (_driver != null)
    {
        _driver.LaunchApp();
        _driver.StartActivity("io.appium.android.apis", ".ApiDemos");
    }
}

[TestCleanup]
public void TestCleanup()
{
    _driver?.CloseApp();
}