diff --git a/views/ngXosLib/generator-xos/app/templates/gulp/build.js b/views/ngXosLib/generator-xos/app/templates/gulp/build.js
index b2b1ade..b66cdbc 100644
--- a/views/ngXosLib/generator-xos/app/templates/gulp/build.js
+++ b/views/ngXosLib/generator-xos/app/templates/gulp/build.js
@@ -150,6 +150,7 @@
   gulp.task('build', function() {
     runSequence(
       'clean',
+      'sass',
       'templates',
       'babel',
       'scripts',
diff --git a/views/ngXosLib/generator-xos/package.json b/views/ngXosLib/generator-xos/package.json
index fc31c37..0098496 100644
--- a/views/ngXosLib/generator-xos/package.json
+++ b/views/ngXosLib/generator-xos/package.json
@@ -4,7 +4,7 @@
   "description": "View generator for XOS",
   "main": "index.js",
   "scripts": {
-    "test": "mocha test --timeout 5000"
+    "test": "mocha test"
   },
   "author": "Matteo Scandolo",
   "license": "ISC",
diff --git a/views/ngXosLib/generator-xos/test/build.spec.js b/views/ngXosLib/generator-xos/test/build.spec.js
new file mode 100644
index 0000000..dd49b03
--- /dev/null
+++ b/views/ngXosLib/generator-xos/test/build.spec.js
@@ -0,0 +1,182 @@
+'use strict';
+var path = require('path');
+var helpers = require('yeoman-test');
+var assert = require('yeoman-assert');
+var exec = require('child_process').exec;
+var fs = require('fs');
+const rimraf = require('rimraf');
+
+const getMillisec = min => min * 60 * 1000;
+const deleteFile = file => {
+  if(fs.existsSync(file)){
+    // console.log(`deleting: ${file}`);
+    fs.unlinkSync(file);
+  }
+}
+
+// source files
+const viewName = 'testDashboard';
+const fileName = viewName.replace(/^./, viewName[0].toUpperCase());
+const sourcePath = path.join(__dirname, `../../../ngXosViews/${viewName}/`);
+
+// dest files
+const basePath = '../../../../xos/core/xoslib';
+const destHtml = path.join(__dirname, basePath + '/dashboards/xosTestDashboard.html');
+const destJs = path.join(__dirname, basePath + '/static/js/xosTestDashboard.js');
+const destVendor = path.join(__dirname, basePath + '/static/js/vendor/xosTestDashboardVendor.js');
+const destCss = path.join(__dirname, basePath + '/static/css/xosTestDashboard.css');
+
+describe('The XOS Build script', function(){
+  const buildCmd = 'gulp build';
+  
+  this.timeout(getMillisec(5));
+
+  before(done => {
+    console.log('Running generator');
+    this.generator = helpers
+      .run(require.resolve('../app'))
+      .inDir(sourcePath)
+      .withOptions({ 'skip-install': false })
+      .withPrompts({
+        name: viewName,
+        host: 'test-host',
+        token: 'test-token',
+        session: 'test-session'
+      })
+      .on('end', () => {
+        process.stdout.write('Installing Node Modules');
+        let npmInstall = setInterval(() => {
+          process.stdout.write('.');
+        }, 1000);
+        exec('npm install', {
+          cwd: sourcePath
+        }, (err) => {
+          clearInterval(npmInstall);
+          process.stdout.write('\nInstalling Bower Components');
+          let bowerInstall = setInterval(() => {
+            process.stdout.write('.');
+          }, 1000);
+          exec('bower install', {
+            cwd: sourcePath
+          }, (err) => {
+            clearInterval(bowerInstall);
+            done(err);
+          });
+        });
+      });
+  });
+
+  describe('when no styles or vendors are added', () => {
+    
+    before((done) => {
+      process.stdout.write('\nBuilding App');
+      let appBuild = setInterval(() => {
+        process.stdout.write('.');
+      }, 1000);
+      exec(buildCmd, {
+        cwd: sourcePath
+      }, (err) => {
+        console.log(err);
+        clearInterval(appBuild);
+        done(err);
+      });
+    });
+
+    it('should have build the app', () => {
+      assert.file([destHtml, destJs]);
+    });
+
+    it('should include only minified files in the index', () => {
+      assert.fileContent(destHtml, `<script src="/static/js/xos${fileName}.js"></script>`);
+      assert.noFileContent(destHtml, `<!-- bower:css -->`);
+      assert.noFileContent(destHtml, `<!-- bower:js -->`);
+    });
+  });
+
+  describe('when a third party library is added', () => {
+    before((done) => {
+    process.stdout.write('\nInstalling 3rd party library');
+      let bowerInstall = setInterval(() => {
+        process.stdout.write('.');
+      }, 1000);
+      exec('bower install d3 --save', {
+        cwd: sourcePath
+      }, (err, out) => {
+        clearInterval(bowerInstall);
+        process.stdout.write('\nBuilding App');
+        let appBuild = setInterval(() => {
+          process.stdout.write('.');
+        }, 1000);
+        exec(buildCmd, {
+          cwd: sourcePath
+        }, (err) => {
+          console.log(err);
+          clearInterval(appBuild);
+          done(err);
+        }); 
+      });
+    });
+
+    it('should have build the app with a vendor file', () => {
+      assert.file([destHtml, destJs, destVendor]);
+    });
+
+    it('should include only minified files and minified deps in the index', () => {
+      assert.fileContent(destHtml, `<script src="/static/js/xos${fileName}.js"></script>`);
+      assert.fileContent(destHtml, `<script src="/static/js/vendor/xos${fileName}Vendor.js"></script>`);
+      assert.noFileContent(destHtml, `<!-- bower:css -->`);
+      assert.noFileContent(destHtml, `<!-- bower:js -->`);
+    });
+  });
+
+  describe('when some styles are added', () => {
+    before((done) => {
+      let styleContent = `
+        @import '../../../../style/sass/lib/_variables.scss';
+
+        #xosTestDashboard {
+          background: $brand-primary;
+        }
+      `;
+
+      fs.writeFile(`${sourcePath}src/sass/main.scss`, styleContent, function(err) {
+        process.stdout.write('\nBuilding the Application');
+        let appBuild = setInterval(() => {
+          process.stdout.write('.');
+        }, 1000);
+        exec('bower uninstall d3 --save', {
+          cwd: sourcePath
+        }, (err, out) => {
+          exec(buildCmd, {
+            cwd: sourcePath
+          }, (err, out) => {
+            clearInterval(appBuild);
+            done();
+          })
+        })
+      });
+    });
+
+    it('should have build the app with a css file', () => {
+      assert.file([destHtml, destJs, destCss]);
+    });
+
+    it('should include only minified files and minified deps in the index', () => {
+      assert.fileContent(destHtml, `<script src="/static/js/xos${fileName}.js"></script>`);
+      assert.fileContent(destHtml, `<link rel="stylesheet" href="/static/css/xos${fileName}.css">`);
+      assert.noFileContent(destHtml, `<!-- bower:css -->`);
+      assert.noFileContent(destHtml, `<!-- bower:js -->`);
+
+      assert.fileContent(destCss, `background:#337ab7`);
+    });
+  });
+
+  after(done => {
+    // deleting the folder used for test
+    deleteFile(destHtml);
+    deleteFile(destJs);
+    deleteFile(destVendor);
+    deleteFile(destCss);
+    rimraf(sourcePath, {}, done);
+  });
+});
\ No newline at end of file
diff --git a/views/ngXosLib/generator-xos/test/xos.spec.js b/views/ngXosLib/generator-xos/test/generator.spec.js
similarity index 100%
rename from views/ngXosLib/generator-xos/test/xos.spec.js
rename to views/ngXosLib/generator-xos/test/generator.spec.js