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"^1.2.0" + } + }, + "yargs-unparser": { + "version": "1.6.0", + "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz", + "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==", + "dev": true, + "requires": { + "flat": "^4.1.0", + "lodash": "^4.17.15", + "yargs": "^13.3.0" + } + } + } +} diff --git a/package.json b/package.json index af067f5..1072ef9 100644 --- a/package.json +++ b/package.json @@ -7,11 +7,21 @@ "url": "http://dph.am" }, "description": "Talk to your Raspberry PI's general purpose inputs and outputs", - "keywords": ["gpio", "raspberry", "pi"], + "keywords": [ + "gpio", + "raspberry", + "pi" + ], "main": "./lib/gpio.js", "repository": "git://github.com/EnotionZ/GpiO.git", "devDependencies": { - "sinon": "*" + "chai": "^4.2.0", + "mkdirp": "^0.5.1", + "mocha": "^6.2.1", + "rimraf": "^3.0.0" + }, + "scripts": { + "test": "mocha ./test/**/*.spec.js" }, "licenses": [ { @@ -20,4 +30,3 @@ } ] } - diff --git a/test/gpio-mock.js b/test/gpio-mock.js new file mode 100644 index 0000000..e6d16b6 --- /dev/null +++ b/test/gpio-mock.js @@ -0,0 +1,66 @@ +const fs = require('fs') +const path = require('path') +const rimraf = require('rimraf') +const mkdirp = require('mkdirp') + +let GPIO_PATH = './sys/class/gpio' +const FILE_TO_WATCH = { + export: `${GPIO_PATH}/export`, + unexport: `${GPIO_PATH}/unexport` +} +let watcher +const pins = new Set() + +module.exports = { + start: function () { + watcher = fs.watch(path.resolve(GPIO_PATH), function (eventType, filename) { + if (eventType === 'change' && Object.keys(FILE_TO_WATCH).includes(filename)) { + const pinNumber = fs.readFileSync(FILE_TO_WATCH[filename]) + + if (filename === 'export') { + createGPIOStructure(pinNumber) + pins.add(pinNumber) + } + + if (filename === 'unexport') { + removeGPIODir(pinNumber) + pins.delete(pinNumber) + } + } + }) + }, + + stop: function (cb) { + watcher.close() + pins.forEach(pinNumber => { + removeGPIODir(pinNumber.toString()) + }) + }, + + setConfig: function ({ gpiopath }) { + GPIO_PATH = gpiopath || GPIO_PATH + }, + + readPinDirection: function (pinNumber) { + return fs.readFileSync(`${getPinPath(pinNumber)}/direction`).toString() + }, + + readPinValue: function (pinNumber) { + return fs.readFileSync(`${getPinPath(pinNumber)}/value`).toString() + } +} + + +function createGPIOStructure (pinNumber) { + mkdirp.sync(getPinPath(pinNumber)) + fs.writeFileSync(`${getPinPath(pinNumber)}/value`, '') + fs.writeFileSync(`${getPinPath(pinNumber)}/direction`, '') +} + +function removeGPIODir (pinNumber) { + rimraf.sync(getPinPath(pinNumber)) +} + +function getPinPath (pinNumber) { + return `${GPIO_PATH}/gpio${pinNumber}` +} diff --git a/test/gpio.spec.js b/test/gpio.spec.js new file mode 100644 index 0000000..739f619 --- /dev/null +++ b/test/gpio.spec.js @@ -0,0 +1,65 @@ +const gpioMock = require('./gpio-mock.js') +const { expect } = require('chai') + +const gpio = require('./../lib/gpio') + + +describe('gpio', () => { + beforeEach(() => { + gpio.setConfig({ + gpiopath: './sys/class/gpio/' + }) + gpioMock.setConfig({ + gpiopath: './sys/class/gpio/' + }) + + gpioMock.start() + }) + + afterEach(() => { + gpioMock.stop() + }) + + describe('with direction "out"', () => { + const direction = 'out' + + it('should initialize pin with "out" direction', (done) => { + const pin4 = gpio.export(4, { + direction, + value: 1, + ready: function () { + expect(gpioMock.readPinDirection(4)).to.equal("out") + done() + } + }) + }) + + it('should initialize pin with value set to 0', (done) => { + const pin4 = gpio.export(4, { + direction, + ready: function () { + this.set(1, () => { + expect(Number(gpioMock.readPinValue(4))).to.equal(1) + done() + }) + } + }) + }) + + it('should set the pin value to "1" and listen on "change" event', (done) => { + const pin4 = gpio.export(4, { + direction, + ready: function () { + this.set(1) + } + }) + + pin4.on("change", function(val) { + expect(val).to.equal(1) + expect(Number(gpioMock.readPinValue(4))).to.equal(val) + pin4.unexport(done) + }); + }) + + }) +})