public void subtracting_vector_produces_diff_vector()
{
var left = new Vector4D(1, 15, 5, 3);
var right = new Vector4D(3, 2, 10, 1);
var expected = new Vector4D(-2, 13, -5, 2);
var actual = left.GetDifference(right);
Assert.Equal(expected, actual);
}
public void op_subtraction_mimics_subtract()
{
var left = new Vector4D(1, 2, 4, 5);
var right = new Vector4D(-3, -100, 40, 52);
var expected = left.GetDifference(right);
var actual = left - right;
Assert.Equal(expected, actual);
}
public void subtracting_vectors_leaves_operands_unchanged()
{
var left = new Vector4D(1, 2, 3, 4);
var expectedLeft = new Vector4D(left);
var right = new Vector4D(3, 4, 5, 6);
var expectedRight = new Vector4D(right);
var result = left.GetDifference(right);
Assert.Equal(expectedLeft, left);
Assert.Equal(expectedRight, right);
}
