public void NotMoveOutsideBoundaries(int offset)
{
// Arrange
var line = new InMemoryLineView();
// Act, Assert
Assert.Throws <ArgumentOutOfRangeException>(() => line.Move(offset));
}
public void Move(int startPos, int offset)
{
// Arrange
var line = new InMemoryLineView();
line.Type("test");
line.MoveTo(startPos);
// Act
line.Move(offset);
// Assert
Assert.Equal(startPos + offset, line.Position);
}