public async Task GetHistoricalPrices_WithChartCloseOnly_Should_FetchResults() { var config = new ConfigurationBuilder() .AddJsonFile("appsettings.json") .Build(); string token = config["TOKEN"]; IEXClient client = new IEXClient(IEXBaseUrl.SandboxUrl, token); string result = await client.GetHistoricalPrices("msft", "5d", chartCloseOnly : true); result.Should().NotBeNullOrEmpty(); }