enhancedmath/lib/__tests__/matrix_inverse.test.js

This package contains some enhanced mathematical operations

import { describe, test, expect } from 'vitest';
import inverse from '../Matrix/inverse';
describe('Matrix Inverse', () => {
    test('should return undefined for non-square matrix', () => {
        const matrix = [
            [1, 2],
            [3, 4],
            [5, 6],
        ];
        const result = inverse(matrix);
        expect(result).toBeUndefined();
    });
    test('should return identity matrix for identity matrix input', () => {
        const matrix = [
            [1, 0],
            [0, 1],
        ];
        const result = inverse(matrix);
        expect(result).toEqual(matrix);
    });
    test('should return inverse for 2x2 matrix', () => {
        const matrix = [
            [4, 7],
            [2, 6],
        ];
        const expectedInverse = [
            [0.6, -0.7],
            [-0.2, 0.4],
        ];
        const result = inverse(matrix);
        expect(result).toEqual(expectedInverse);
    });
    test('should return inverse for 3x3 matrix', () => {
        const matrix = [
            [3, 0, 2],
            [2, 0, -2],
            [0, 1, 1],
        ];
        const expectedInverse = [
            [0.2, 0.2, 0],
            [-0.2, 0.3, 1],
            [0.2, -0.3, 0],
        ];
        const result = inverse(matrix);
        expect(result).toEqual(expectedInverse);
    });
    test('should return undefined for singular matrix (det = 0)', () => {
        const matrix = [
            [2, 4],
            [1, 2],
        ];
        const result = inverse(matrix);
        expect(result).toBeUndefined();
    });
});