public void Statistics_Calculated_In_Constructor()
{
var chats = Data.GetChatsB();
var calculator = new SummaryStatisticsCalculator();
var lines = calculator.GetStatisticsFromEnumerable(chats.Select(chat => (double)chat.Lines));
var minutes = calculator.GetStatisticsFromEnumerable(chats.Select(chat => (double)chat.Minutes));
var collection = new ChatCollection(chats);
Assert.AreEqual(lines, collection.LineStatistics);
Assert.AreEqual(minutes, collection.MinuteStatistics);
}
public void Statistics_Updated_On_Add()
{
var collection = new ChatCollection(Data.GetChatsB());
collection.Add(Data.GetChatA());
var chats = Data.GetChatsB().ToList();
chats.Add(Data.GetChatA());
var calculator = new SummaryStatisticsCalculator();
var lines = calculator.GetStatisticsFromEnumerable(chats.Select(chat => (double)chat.Lines));
var minutes = calculator.GetStatisticsFromEnumerable(chats.Select(chat => (double)chat.Minutes));
Assert.AreEqual(lines, collection.LineStatistics);
Assert.AreEqual(minutes, collection.MinuteStatistics);
}
public void Overloads_Match()
{
var data = new[]
{
new { x = 1, y = 2 },
new { x = 5, y = 17 },
new { x = 12, y = -9 }
};
var calculator = new SummaryStatisticsCalculator();
var selectorSummary = calculator.GetStatisticsFromEnumerable(data, obj => obj.x + obj.y);
var array = data.Select(obj => (double)obj.x + obj.y);
var nonSelectorSummary = calculator.GetStatisticsFromEnumerable(array);
Assert.AreEqual(selectorSummary, nonSelectorSummary);
}
public void Calculates_Correct_Summary_Statistics()
{
var data = new [] { 11, 21, 38, 25, 3, 5, 16, 49, 48, 66, 21, 41, 8, 80, 16, 44, 88, 82, 60, 30 };
var statistics = new SummaryStatisticsCalculator().GetStatisticsFromEnumerable(data, x => (double)x);
var expectedStatistics = new SummaryStatistics
{
Minimum = 3,
Maximum = 88,
Median = 34,
Sum = 752,
Mean = 37.6,
StandardDeviation = 25.935304
};
Assert.AreEqual(statistics, expectedStatistics);
}
public void Calculates_Correct_Median_When_Length_Is_Odd()
{
var statistics = new SummaryStatisticsCalculator().GetStatisticsFromEnumerable(new double[] { 1, 2, 3 });
Assert.AreEqual(statistics.Median, 2);
}
