Add what's new check in the build Fixed #3592

.travis.yml

@@ -18,6 +18,7 @@ before_script:
 - "sh -e /etc/init.d/xvfb start"
 - sleep 3 # give xvfb some time to start
 script: 
+- gulp tests-whatsnew
 - set -e
 - gulp typescript-all
 - gulp typedoc-all

Tools/Gulp/gulpfile.js

@@ -27,13 +27,14 @@ var sass = require("gulp-sass");
 var webpack = require("webpack-stream");
 var typedoc = require("gulp-typedoc");
 var validateTypedoc = require("./gulp-validateTypedoc");
+var request = require('request');
+var fs = require("fs");
+var karmaServer = require('karma').Server;
 
 var config = require("./config.json");
 
 var del = require("del");
 
-var karmaServer = require('karma').Server;
-
 var debug = require("gulp-debug");
 var includeShadersStream;
 var shadersStream;
@@ -939,3 +940,45 @@ gulp.task("tests-unit", ["tests-unit-transpile"], function (done) {
     var server = new karmaServer(kamaServerOptions, done);
     server.start();
 });
+
+gulp.task("tests-whatsnew", function(done) {
+    // Only checks on Travis
+    if (!process.env.TRAVIS) {
+        done();
+        return;
+    }
+
+    // Only checks on Pull Requests
+    if (process.env.TRAVIS_PULL_REQUEST == "false") {
+        done();
+        return;
+    }
+
+    // Do not check deploy
+    if (process.env.TRAVIS_BRANCH == "preview") {
+        done();
+        return;
+    }
+
+    // Compare what's new with the current one in the preview release folder.
+    const https = require("https");
+    const url = "https://rawgit.com/BabylonJS/Babylon.js/master/dist/preview%20release/what's%20new.md";
+    https.get(url, res => {
+        res.setEncoding("utf8");
+        let oldData = "";
+        res.on("data", data => {
+            oldData += data;
+        });
+        res.on("end", () => {
+            fs.readFile("../../dist/preview release/what's new.md", "utf-8", function(err, newData) {
+                if (err || oldData != newData) {
+                    done();
+                    return;
+                }
+                
+                console.error("What's new file did not change.");
+                process.exit(1);
+            });
+        });
+    });
+});

dist/preview release/what's new.md

@@ -1,7 +1,7 @@
 # 3.2.0
 
 ## Major updates
-- Improved building process: We now run a full visual validation test for each pull request. Furthermore, code comments are now mandatory ([sebavan](https://github.com/sebavan))
+- Improved building process: We now run a full visual validation test for each pull request. Furthermore, code comments and what's new updates are now mandatory ([sebavan](https://github.com/sebavan))
 - Introduced texture binding atlas. This optimization allows the engine to reuse texture bindings instead of rebinding textures when they are not on constant sampler indexes ([deltakosh](https://github.com/deltakosh))
 - New [AnimationGroup class](http://doc.babylonjs.com/how_to/group) to control simultaneously multiple animations with different targets ([deltakosh](https://github.com/deltakosh))
 - `WebVRCamera` now supports GearVR ([brianzinn](https://github.com/brianzinn))