public void Random_resurns_as_many_items_as_SampleSize()
{
// arrange
const int SampleSize = 10;
var collectionOf100 = Enumerable.Range(0, 100).ToList();
var sut = new RandomSampler(SampleSize, collectionOf100.Count);
// act
var result = sut.Random(collectionOf100);
result.Should().HaveCount(SampleSize);
result.Should().OnlyHaveUniqueItems();
}
public void Random_returns_input_when_SampleSize_is_greater_or_equeal_ItemsCount()
{
// arrange
var collectionOf10 = Enumerable.Range(0, 10).ToList();
const int SampleSize = 100;
var sut = new RandomSampler(SampleSize, collectionOf10.Count);
// act
var result = sut.Random(collectionOf10);
// assert
result.Should().BeEquivalentTo(collectionOf10);
}
public void Random_should_reduce_dataset_to_get_samples()
{
// arrange
var collectionOf10_000 = Enumerable.Range(0, 10_000).ToList();
const int SampleSize = 2;
var sut = new RandomSampler(SampleSize, collectionOf10_000.Count);
// act
var result = sut.Random(collectionOf10_000.Take(1000).ToList());
// assert
var dataShouldUsedForSamples = collectionOf10_000.Take(20).ToList();
//result.Should().OnlyContain(x => dataShouldUsedForSamples.Contains(x)); //burilovmv: why???
result.Should().HaveCount(SampleSize);
}