enhancedmath/lib/__tests__/matrix_cofactor.test.js

This package contains some enhanced mathematical operations

import { test, describe, expect } from 'vitest';
import cofactorMatrix from '../Matrix/cofactor';
describe('Matrix Co-factor', () => {
    test('should return correct cofactor matrix for 2x2 matrix', () => {
        const matrix = [
            [1, 2],
            [3, 4],
        ];
        const expected = [
            [4, -3],
            [-2, 1],
        ];
        const result = cofactorMatrix(matrix);
        expect(result).toEqual(expected);
    });
    test('should return correct cofactor matrix for 3x3 matrix', () => {
        const matrix = [
            [1, 2, 3],
            [4, 5, 6],
            [7, 8, 9],
        ];
        const expected = [
            [-3, 6, -3],
            [6, -12, 6],
            [-3, 6, -3],
        ];
        const result = cofactorMatrix(matrix);
        expect(result).toEqual(expected);
    });
    test('should return correct cofactor matrix for 4x4 matrix', () => {
        const matrix = [
            [1, 2, 3, 4],
            [5, 6, 7, 8],
            [9, 10, 11, 12],
            [13, 14, 15, 16],
        ];
        const expected = [
            [0, 0, 0, 0],
            [0, 0, 0, 0],
            [0, 0, 0, 0],
            [0, 0, 0, 0],
        ];
        const result = cofactorMatrix(matrix);
        expect(result).toEqual(expected);
    });
    test('should return correct cofactor matrix for 4x4 matrix', () => {
        const matrix = [
            [1, 2, 3, 23],
            [4, 5, 6, 1],
            [7, 8, 9, 15],
            [34, 65, 22, 34],
        ];
        const expected = [
            [3689, -1384, -1269, -222],
            [7346, -2704, -4050, 444],
            [-6391, 2792, 1971, -222],
            [108, -216, 108, 0],
        ];
        const result = cofactorMatrix(matrix);
        expect(result).toEqual(expected);
    });
    test('should return undefined when input matrix is not square', () => {
        const matrix = [
            [1, 2, 3],
            [4, 5, 6],
        ];
        const result = cofactorMatrix(matrix);
        expect(result).toBeUndefined();
    });
});