public void GetMortgageRates_ReturnsRatesList()
{
var options = new DbContextOptionsBuilder <MortgageDbContext>().UseInMemoryDatabase(databaseName: "MortgageDbTest1").Options;
var dbContext = new MortgageDbContext(options);
Seed(dbContext);
var service = new MortgageService(new MortgageRateRepository(dbContext));
var rates = service.GetMortgageRates();
Assert.NotEmpty(rates);
Assert.Equal(12, rates.Count);
}