nexxtway/react-rainbow

import { getContrastRatio } from '../color';

jest.mock('../color/getLuminance', () => color => {
    if (color === '#f00') {
        return 0.5;
    }
    return 0.41;
});

describe('getContrastRatio', () => {
    const colors = [
        {
            foreground: '#f00',
            background: '#01b6f5',
            result: 1.195,
        },
        {
            foreground: 'rgb(255, 255, 255)',
            background: 'rgb(1, 182, 245)',
            result: 0.999,
        },
        {
            foreground: 'hsl(0, 0%, 100%)',
            background: 'hsl(0, 100%, 50%)',
            result: 0.999,
        },
    ];

    it('should return the right value', () => {
        colors.forEach((value, idx) => {
            expect(getContrastRatio(value.foreground, value.background)).toBeCloseTo(
                colors[idx].result,
            );
        });
    });
});