public void EmptyStream()
{
// Arrange
var emptyByteArray = new byte[0];
var needle = "needle";
using (var memStream = new MemoryStream(emptyByteArray))
using (var sStream = new SearchableStringStream(memStream))
{
sStream.Seek(0, SeekOrigin.End);
// Act
var foundPositions = sStream.IndexOfAllBackwards(needle);
// Assert
Assert.AreEqual(0, foundPositions.Length);
}
}
public void NotInStream()
{
// Arrange
var haystackByteArray = Encoding.ASCII.GetBytes("This haystack does not contain a n-e-e-d-l-e");
var needle = "needle";
using (var memStream = new MemoryStream(haystackByteArray))
using (var sStream = new SearchableStringStream(memStream))
{
sStream.Seek(0, SeekOrigin.End);
// Act
var foundPositions = sStream.IndexOfAllBackwards(needle);
// Assert
Assert.AreEqual(0, foundPositions.Length);
}
}
public void SingleOccuranceAtEnd()
{
// Arrange
var haystackByteArray = Encoding.ASCII.GetBytes("haystack with a needle");
var needle = "needle";
using (var memStream = new MemoryStream(haystackByteArray))
using (var sStream = new SearchableStringStream(memStream))
{
sStream.Seek(0, SeekOrigin.End);
// Act
var foundPositions = sStream.IndexOfAllBackwards(needle);
// Assert
Assert.AreEqual(1, foundPositions.Length);
Assert.AreEqual(16, foundPositions[0]);
}
}
public void MultipleOccuranceSelectTwo()
{
// Arrange
var haystackByteArray = Encoding.ASCII.GetBytes("This hay stack has a needle here and another needle here and another needle here");
var needle = "needle";
using (var memStream = new MemoryStream(haystackByteArray))
using (var sStream = new SearchableStringStream(memStream))
{
sStream.Seek(0, SeekOrigin.End);
// Act
var foundPositions = sStream.IndexOfAllBackwards(needle, 2);
// Assert
Assert.AreEqual(2, foundPositions.Length);
Assert.AreEqual(45, foundPositions[1]);
Assert.AreEqual(69, foundPositions[0]);
}
}