public void LookAheadReturnsNothingWhenOutOfRange()
{
//Arrange
var input = "123";
var scanState = new SourceScanState(input.AsMemory());
//Act
scanState.LookAhead(4).IsEmpty.Should().BeTrue();
}
public void LookAheadReturnsStuff()
{
//Arrange
var input = "123";
var scanState = new SourceScanState(input.AsMemory());
//Act
scanState.LookAhead(2).ToArray().Should().BeEquivalentTo(new[] { '1', '2' });
}
public void LookAheadWhenAtEndReturnsEmpty()
{
//Arrange
var input = "123";
var scanState = new SourceScanState(input.AsMemory());
scanState.Advance();
scanState.Advance();
scanState.Advance();
//Act & Assert
scanState.LookAhead(2).IsEmpty.Should().BeTrue();
}