public async Task Get_Trades_By_Symbol_Valid_Count()
{
string symbol = "REL";
var builder = new DbContextOptionsBuilder <ExchangeContext>();
builder.UseInMemoryDatabase(databaseName: "TestTrade2");
var context = new ExchangeContext(builder.Options);
exchangeContextInit(context);
var repo = new TradeRepository(context);
var result = await repo.GetBySymbol(symbol) as List <Trade>;;
var count = result.Count;
Assert.AreEqual(2, count);
}