var mock = require('mock-fs');
var fs = require('fs');

var gpio = require('../gpio');

describe('GPIO API', function () {
    it('opens a pin with out', function (done) {
        mock({
            '/sys/class/gpio/gpio23/direction': ''
        });

        gpio.open(16, 'out', function () {
            const direction = fs.readFileSync('/sys/class/gpio/gpio23/direction').toString();

            expect(direction).toEqual('out');

            done();
        });
    });

    it('writes to a pin with a high value', function (done) {
        mock({
            '/sys/class/gpio/gpio23/value': '0'
        });

        gpio.write(16, 5, function () {
            const value = fs.readFileSync('/sys/class/gpio/gpio23/value').toString();

            expect(value).toEqual('1');

            done();
        });
    });

    it('writes to a pin with a low value', function (done) {
        mock({
            '/sys/class/gpio/gpio23/value': '1'
        });

        gpio.write(16, 0, function () {
            const value = fs.readFileSync('/sys/class/gpio/gpio23/value').toString();

            expect(value).toEqual('0');

            done();
        });
    });

    afterEach(function () {
        mock.restore();
    });
});