public void GetStockPricesReturnsUniqueTickers()
{
const int NumberOfStocks = 200;
const int TickerLength = 3;
IEnumerable <StockPrice> prices;
using (MockStockPriceFeed feed = new MockStockPriceFeed(NumberOfStocks, TickerLength, 10, 10000))
{
prices = feed.GetStockPrices(null);
}
Assert.False(prices.GroupBy(p => p.Ticker).Any(g => g.Count() > 1), "Tickers are not unique");
}
public void GetStockPricesReturnsAllStocks()
{
const int NumberOfStocks = 10;
const int TickerLength = 3;
IEnumerable <StockPrice> prices;
using (MockStockPriceFeed feed = new MockStockPriceFeed(NumberOfStocks, TickerLength, 10, 10000))
{
prices = feed.GetStockPrices(null);
}
Assert.AreEqual(NumberOfStocks, prices.Count(), "Number of stock prices not as expected");
}
public void GetStockPricesReturnsTickersOfCorrectLength()
{
const int NumberOfStocks = 10;
const int TickerLength = 3;
IEnumerable <StockPrice> prices;
using (MockStockPriceFeed feed = new MockStockPriceFeed(NumberOfStocks, TickerLength, 10, 10000))
{
prices = feed.GetStockPrices(null);
}
foreach (StockPrice stockPrice in prices)
{
Assert.AreEqual(TickerLength, stockPrice.Ticker.Length, "Ticker length not as expected {0}", stockPrice.Ticker);
}
}
public void GetStockPricesFiltersTickersThatStartsWithValue()
{
const int NumberOfStocks = 10;
const int TickerLength = 3;
using (MockStockPriceFeed feed = new MockStockPriceFeed(NumberOfStocks, TickerLength, 10, 10000))
{
IEnumerable <StockPrice> allPrices = feed.GetStockPrices(null);
foreach (char character in "ABCDEFGHIJKLMNOPQRSTUVWXYZ")
{
string filter = character.ToString();
int expected = allPrices.Count(p => p.Ticker.StartsWith(filter));
IEnumerable <StockPrice> filteredPrices = feed.GetStockPrices(filter);
Assert.AreEqual(expected, filteredPrices.Count(), "Number of stock prices that start with {0} not as expected", filter);
foreach (StockPrice stockPrice in filteredPrices)
{
Assert.True(stockPrice.Ticker.StartsWith(filter), "All tickers should start with {0}: {1}", filter, stockPrice.Ticker);
}
}
}
}
public void GetStockPricesReturnsChangedPrices()
{
const int NumberOfStocks = 10;
const int TickerLength = 3;
const int RepriceInterval = 100;
IEnumerable <StockPrice> firstPrices;
IEnumerable <StockPrice> secondPrices;
using (MockStockPriceFeed feed = new MockStockPriceFeed(NumberOfStocks, TickerLength, 100, RepriceInterval))
{
firstPrices = feed.GetStockPrices(null).Select(sp => new StockPrice(sp.Ticker, sp.Price, sp.PriceTime)).ToArray();
Thread.Sleep(RepriceInterval * 2);
secondPrices = feed.GetStockPrices(null).Select(sp => new StockPrice(sp.Ticker, sp.Price, sp.PriceTime)).ToArray();
}
var query = from first in firstPrices
join second in secondPrices
on first.Ticker equals second.Ticker
where first.Price == second.Price
select $"{first.Ticker} | {first.Price} | {second.Price}";
Assert.False(query.Any(), "Not all prices changed: {0}", string.Join(", ", query));
}
