Add question about desired styles lang

app/index.js

@@ -63,6 +63,25 @@ ReactWebpackGenerator.prototype.askForReactRouter = function () {
   }.bind(this));
 };
 
+ReactWebpackGenerator.prototype.askForStylesLanguage = function () {
+  var done = this.async();
+  this.prompt({
+    type    : 'list',
+    name    : 'stylesLanguage',
+    message : 'Which styles language you want to use?',
+    choices: [
+        {name: 'CSS', value: 'css'},
+        {name: 'SASS', value: 'sass'},
+        {name: 'LESS', value: 'less'},
+        {name: 'Stylus', value: 'stylus'}
+    ],
+    default : 'css'
+  }, function (props) {
+    this.config.set('styles-language', props.stylesLanguage);
+    done();
+  }.bind(this));
+};
+
 ReactWebpackGenerator.prototype.readIndex = function readIndex() {
   this.indexFile = this.engine(this.read('../../templates/common/index.html'), this);
 };

test/test-creation.js

@@ -111,6 +111,46 @@ describe('react-webpack generator', function() {
 
   });
 
+  describe('Generator', function () {
+
+    it('should contain info about used style lang', function (done) {
+      react.run({}, function() {
+        assert.ok(react.config.get('styles-language'));
+        done();
+      });
+    });
+
+    it('by default should use css style lang', function (done) {
+      react.run({}, function() {
+        assert.equal(react.config.get('styles-language'), 'css');
+        done();
+      });
+    });
+
+    var assertStyle = function (lang, done) {
+      helpers.mockPrompt(react, {
+        stylesLanguage: lang
+      });
+      react.run({}, function() {
+        assert.equal(react.config.get('styles-language'), lang);
+        done();
+      });
+    };
+
+    it('should use sass style lang', function (done) {
+      assertStyle('sass', done);
+    });
+
+    it('should use less style lang', function (done) {
+      assertStyle('less', done);
+    });
+
+    it('should use stylus style lang', function (done) {
+      assertStyle('stylus', done);
+    });
+
+  });
+
   describe('Subgenerators', function() {
     var generatorTest = function(generatorType, specType, targetDirectory, scriptNameFn, specNameFn, suffix, done) {