public void SetUp()
{
mainPage = new MainPage(WebDriver);
yandexMusicPage = new YandexMusicPage(WebDriver);
loginPage = new LoginPage(WebDriver);
mailIncomingMessagesPage = new MailPage(WebDriver);
mainPage.MailLoginClick();
windowActions.SwitchBetweenWindows(WebDriver, 1);
loginPage.SignIn(TestData.validLogin, TestData.validPassword);
mailIncomingMessagesPage.YandexHeaderClick();
}