public async Task Test(TransactionViewModel transaction, IEnumerable <RateModel> rates, decimal expectedValue)
{
Mock <IRateService <RateModel> > service = new Mock <IRateService <RateModel> >();
Mock <IDuplicateRatesCleaner> duplicateRatesCleaner = new Mock <IDuplicateRatesCleaner>();
service.Setup(opt => opt.TryGetRates()).ReturnsAsync(rates);
duplicateRatesCleaner.Setup(opt => opt.DeletingDuplicates(rates)).Returns(rates);
ICurrencyConverter converter = new CurrencyConverter(service.Object, duplicateRatesCleaner.Object);
TransactionViewModel result = await converter.ApplyConversion(transaction);
Assert.That(Equals(result.AmountConverted, expectedValue), $"Value expected {expectedValue}, value result {result.AmountConverted}");
}