Renamed CryptoStatsSourceTest.cs and added a CryptoNameResolver, that resolves cryptocurrency names based on their symbols

Author: topnax

CryptoStatsSource/CryptoNameResolver.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace CryptoStatsSource
+{
+    public interface ICryptoNameResolver
+    {
+        public Task<string> Resolve(string symbol);
+
+        public Task Refresh();
+    }
+
+    public class CryptoNameResolverImpl : ICryptoNameResolver
+    {
+        private ICryptoStatsSource _cryptoStatsSource;
+        private Dictionary<String, String> _symbolToNameMap;
+
+        public CryptoNameResolverImpl(ICryptoStatsSource cryptoStatsSource)
+        {
+            _cryptoStatsSource = cryptoStatsSource;
+        }
+
+        public async Task Refresh()
+        {
+            _symbolToNameMap = new();
+            (await _cryptoStatsSource.GetAvailableCryptocurrencies()).ForEach(c =>
+                _symbolToNameMap.TryAdd(c.Symbol, c.Name));
+        }
+
+
+        public async Task<string> Resolve(string symbol)
+        {
+            if (_symbolToNameMap?.GetValueOrDefault(symbol) == null) await Refresh();
+
+            return _symbolToNameMap.GetValueOrDefault(symbol, null);
+        }
+    }
+}

Tests/Integration/CryptoStatsSource/CryptoNameResolverTest.cs

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+using CryptoStatsSource;
+using Xunit;
+
+namespace Tests.Integration.CryptoStatsSource
+{
+    public class ResolveNameTest
+    {
+        private readonly CoingeckoSource _source;
+        private readonly CryptoNameResolverImpl _resolver;
+
+        public ResolveNameTest()
+        {
+            _source = new();
+            _resolver = new(_source);
+        }
+
+        [Fact]
+        public async void SimpleThreeEntries()
+        {
+            Assert.Equal("Bitcoin", await _resolver.Resolve("btc"));
+            Assert.Equal("Cardano", await _resolver.Resolve("ada"));
+            Assert.Equal("Litecoin", await _resolver.Resolve("ltc"));
+            Assert.Equal("Ethereum", await _resolver.Resolve("eth"));
+            Assert.Null(await _resolver.Resolve("abcefghbzbzrfoo"));
+        }
+    }
+}