public void Counts_a_nucleotide_only_once()
{
var dna = new Dna("GGTTGG");
dna.Count('T');
Assert.That(dna.Count('T'), Is.EqualTo(2));
}
private void UpdatePosition(Point a, MoveDir dir)
{
//trim out redundant back and forth movement
if (Dna.Count() > 1 && (int)dir == (int)(Dna.Last() + 2) % 4)
{
//reset our position back
switch (Dna.Last())
{
case MoveDir.N:
Pos = new Point(Pos.X, Pos.Y + 1);
break;
case MoveDir.W:
Pos = new Point(Pos.X + 1, Pos.Y);
break;
case MoveDir.S:
Pos = new Point(Pos.X, Pos.Y - 1);
break;
case MoveDir.E:
Pos = new Point(Pos.X - 1, Pos.Y);
break;
}
//remove last dna record
Dna.RemoveAt(Dna.Count() - 1);
Path.RemoveAt(Path.Count() - 1);
return;
}
Path.Add(a);
Pos = a;
Dna.Add(dir);
}
public void Validates_nucleotides()
{
var dna = new Dna("GGTTGG");
Assert.Throws <InvalidNucleotideException>(() => dna.Count('X'));
}
public void Counts_only_thymidine()
{
var dna = new Dna("GGGGTAACCCGG");
Assert.That(dna.Count('T'), Is.EqualTo(1));
}
public void Repetitive_cytidine_gets_counts()
{
var dna = new Dna("CCCCC");
Assert.That(dna.Count('C'), Is.EqualTo(5));
}
public void Has_no_adenosine()
{
var dna = new Dna("");
Assert.That(dna.Count('A'), Is.EqualTo(0));
}
