public async Task Index_ReturnsAViewResult_WithAListOfManagers()
{
//Arrange
var dbContext = await GetDatabaseContext();
var managersController = new ManagersController(dbContext);
//Act
var result = await managersController.Index("", "", "", null);
// Assert
var viewResult = Assert.IsType <ViewResult>(result);
var model = Assert.IsAssignableFrom <IEnumerable <Manager> >(
viewResult.ViewData.Model);
Assert.Equal(2, model.Count());
}