Make nodejs test cases compatible with npm and local source

wrappers/nodejs/test/README.md

@@ -0,0 +1,18 @@
+# Nodejs Wrapper Tests
+
+# Installing node-librealsense #
+There are two ways to get node-librealsense module before testing: **install from npm** and **build from source**, both used **mocha** (`npm install mocha`) as test framework.
+
+## Install From Npm
+Used for feature validation in released node-librealsense module which updates bi-weekly.
+Execute `npm i` under `/path/to/wrappers/nodejs/test` to download and install latest module from [npm](https://www.npmjs.com/package/node-librealsense).
+
+## Build From Source
+Used for checking latest features in development branch which hasn't been released on npm.
+Execute `npm list node-librealsense` to check if you had installed node-librealsense before, if yes, remove it by using `npm remove node-librealsense`
+
+# Running the Tests #
+Use mocha to run test cases, for example:
+Execute `mocha *.js` for all test cases under `/path/to/wrappers/nodejs/test`
+or
+Execute `mocha test-colorizer.js` for single test case

wrappers/nodejs/test/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "node-librealsense2-tests",
+  "version": "0.0.1",
+  "description": "",
+  "author": "",
+  "license": "Apache-2.0",
+  "dependencies": {
+    "node-librealsense": "^0.281.0"
+  }
+}

wrappers/nodejs/test/test-colorizer.js

@@ -5,7 +5,12 @@
 
 /* global describe, it, before, after */
 const assert = require('assert');
-const rs2 = require('../index.js');
+let rs2;
+try {
+  rs2 = require('node-librealsense');
+} catch (e) {
+  rs2 = require('../index.js');
+}
 
 let ctx;
 describe('Colorizer test', function() {

wrappers/nodejs/test/test-context.js

@@ -7,9 +7,23 @@
 /* global describe, it */
 const assert = require('assert');
 const EventEmitter = require('events');
-const librealsense2 = require('../index.js');
+let librealsense2;
+try {
+  librealsense2 = require('node-librealsense');
+} catch (e) {
+  librealsense2 = require('../index.js');
+}
 
 describe('Context test', function() {
+  before(function() {
+    const ctx = new librealsense2.Context();
+    const devices = ctx.queryDevices().devices;
+    assert(devices.length > 0); // Device must be connected
+  });
+
+  after(function() {
+    librealsense2.cleanup();
+  });
   it('testing constructor', () => {
     assert.doesNotThrow(() => {
       new librealsense2.Context();

wrappers/nodejs/test/test-depthsensor.js

@@ -6,7 +6,12 @@
 
 /* global describe, it, before, after */
 const assert = require('assert');
-const rs2 = require('../index.js');
+let rs2;
+try {
+  rs2 = require('node-librealsense');
+} catch (e) {
+  rs2 = require('../index.js');
+}
 
 let ctx;
 let depthSensor;

wrappers/nodejs/test/test-device.js

@@ -6,7 +6,12 @@
 
 /* global describe, it, beforeEach, afterEach */
 const assert = require('assert');
-const rs2 = require('../index.js');
+let rs2;
+try {
+  rs2 = require('node-librealsense');
+} catch (e) {
+  rs2 = require('../index.js');
+}
 
 let ctx;
 let dev;

wrappers/nodejs/test/test-frame.js

@@ -6,7 +6,12 @@
 
 /* global describe, it, before, after */
 const assert = require('assert');
-const rs2 = require('../index.js');
+let rs2;
+try {
+  rs2 = require('node-librealsense');
+} catch (e) {
+  rs2 = require('../index.js');
+}
 
 let frame;
 describe('Frame test', function() {

wrappers/nodejs/test/test-frameset.js

@@ -6,7 +6,12 @@
 
 /* global describe, it, before, after */
 const assert = require('assert');
-const rs2 = require('../index.js');
+let rs2;
+try {
+  rs2 = require('node-librealsense');
+} catch (e) {
+  rs2 = require('../index.js');
+}
 
 let frameset;
 describe('FrameSet test', function() {

wrappers/nodejs/test/test-functional.js

@@ -6,9 +6,24 @@
 
 /* global describe, it, before, after */
 const assert = require('assert');
-const rs2 = require('../index.js');
+let rs2;
+try {
+  rs2 = require('node-librealsense');
+} catch (e) {
+  rs2 = require('../index.js');
+}
 
 describe('Pipeline tests', function() {
+  before(function() {
+    const ctx = new rs2.Context();
+    const devices = ctx.queryDevices().devices;
+    assert(devices.length > 0); // Device must be connected
+  });
+
+  after(function() {
+    rs2.cleanup();
+  });
+
   it('Default pipeline', () => {
     const pipe = new rs2.Pipeline();
     pipe.start();
@@ -616,6 +631,7 @@ describe(('DeviceHub test'), function() {
   after(() => {
     hub.destroy();
     ctx.destroy();
+    rs2.cleanup();
   });
   it('API test', () => {
     const dev = hub.waitForDevice();

wrappers/nodejs/test/test-pipeline.js

@@ -6,7 +6,12 @@
 
 /* global describe, it, before, after */
 const assert = require('assert');
-const rs2 = require('../index.js');
+let rs2;
+try {
+  rs2 = require('node-librealsense');
+} catch (e) {
+  rs2 = require('../index.js');
+}
 
 let ctx;
 let dev;

wrappers/nodejs/test/test-pointcloud.js

@@ -6,7 +6,12 @@
 
 /* global describe, it, before, after */
 const assert = require('assert');
-const rs2 = require('../index.js');
+let rs2;
+try {
+  rs2 = require('node-librealsense');
+} catch (e) {
+  rs2 = require('../index.js');
+}
 
 let ctx;
 describe('Pointcloud test', function() {

wrappers/nodejs/test/test-points.js

@@ -6,7 +6,12 @@
 
 /* global describe, it, before, after */
 const assert = require('assert');
-const rs2 = require('../index.js');
+let rs2;
+try {
+  rs2 = require('node-librealsense');
+} catch (e) {
+  rs2 = require('../index.js');
+}
 
 let ctx;
 describe('Points test', function() {

wrappers/nodejs/test/test-sensor.js

@@ -6,7 +6,12 @@
 
 /* global describe, it, before, after */
 const assert = require('assert');
-const rs2 = require('../index.js');
+let rs2;
+try {
+  rs2 = require('node-librealsense');
+} catch (e) {
+  rs2 = require('../index.js');
+}
 const RS2 = require('bindings')('node_librealsense');
 
 let ctx;