public void adding_null_vector_throws()
{
var left = new VectorD(3);
VectorD right = null;
Assert.Throws <ArgumentNullException>(() => left.GetSum(right));
}
public void adding_vectors_of_different_size_throws()
{
var left = new VectorD(3);
var right = new VectorD(4);
Assert.NotEqual(left.Dimensions, right.Dimensions);
Assert.Throws <ArgumentOutOfRangeException>(() => left.GetSum(right));
}
public void adding_vectors_does_not_mutate_operands()
{
var left = new VectorD(3);
left.Set(0, 1);
left.Set(1, 3);
left.Set(2, -4);
var expectedLeft = new VectorD(left);
var right = new VectorD(3);
right.Set(0, -10);
right.Set(1, 4);
right.Set(2, -20);
var expectedRight = new VectorD(right);
left.GetSum(right);
Assert.Equal(expectedRight, right);
Assert.Equal(expectedLeft, left);
}
public void can_add_vectors_of_same_size()
{
var left = new VectorD(3);
left.Set(0, 1);
left.Set(1, 3);
left.Set(2, -4);
var right = new VectorD(3);
right.Set(0, -10);
right.Set(1, 4);
right.Set(2, -20);
var expected = new VectorD(3);
expected.Set(0, -9);
expected.Set(1, 7);
expected.Set(2, -24);
var actual = left.GetSum(right);
Assert.Equal(expected, actual);
}