flo-poly/__tests__/basic/expansion/e-subtract.spec.ts

A practical, root-focused JavaScript polynomial utility library.

import { assert, expect } from 'chai';
import { describe } from 'mocha';
import { eSubtract } from '../../../src/index.js';


describe('eSubtract', function() {
	it('should correctly subtract some polynomials with Shewchuk expansion coefficients from each other', 
	function() {
		let p1 = [    [2],[3]];
		let p2 = [[4],[4],[4]];
		let p3 = [[2],[1],[2]];
		let p4: number[][] = [];
			
		expect(eSubtract(p1,p2)).to.eql([[-4],[-2],[-1]]);
		expect(eSubtract(p2,p1)).to.eql([[4],[2],[1]]);
		expect(eSubtract(p2,p3)).to.eql([[2],[3],[2]]);
		expect(eSubtract(p2,p4)).to.eql([[4],[4],[4]]);
		expect(eSubtract(p4,p2)).to.eql([[-4],[-4],[-4]]);
	});
});