public async Task IndexReturnTypeTest()
{
var optionsBuilder = new DbContextOptionsBuilder <ApplicationDbContext>();
optionsBuilder.UseInMemoryDatabase(databaseName: "db1");
var _dbContext = new ApplicationDbContext(optionsBuilder.Options);
var controller = new BudgetsController(_dbContext);
var result = await controller.Index();
Assert.IsType <ViewResult>(result);
}