btcpayserver/BTCPayServer/Services/Rates/MockRateProvider.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using System.Threading.Tasks;

namespace BTCPayServer.Services.Rates
{
    public class MockRateProvider : IRateProvider
    {
        List<Rate> _Rates;

        public MockRateProvider(params Rate[] rates)
        {
            _Rates = new List<Rate>(rates);
        }
        public MockRateProvider(List<Rate> rates)
        {
            _Rates = rates;
        }
        public Task<decimal> GetRateAsync(string currency)
        {
            var rate = _Rates.FirstOrDefault(r => r.Currency.Equals(currency, StringComparison.OrdinalIgnoreCase));
            if (rate == null)
                throw new RateUnavailableException(currency);
            return Task.FromResult(rate.Value);
        }

        public Task<ICollection<Rate>> GetRatesAsync()
        {
            ICollection<Rate> rates = _Rates;
            return Task.FromResult(rates);
        }
    }
}