isAsync and some refactoring

- restored htmlBeautifier func-ty
- reworked langs it render
- added isAsync flag to force calling .apply on engine

lib/assets/it.jst

@@ -1,13 +1,47 @@
-it('should be equal `${ it }` by ${ engine.name }', function (<% if (saveHtml) { %>done<% } %>) {
-    var bemjson = references['${ it }'].bemjson,
-        expected = references['${ it }'].html,
-        actual = engines['${ engine.name }'].apply(bemjson);
+<%
+// prepares
+var titleSuffix = lang ? ' in `' + lang + '` lang' : '';
+var subreference = lang ? '[' + lang + ']' : '';
+var prettifyEngineName = function (ngn) {
+    return lang ? String(ngn).toLowerCase().replace(' ', '-') + '.' + lang : ngn;
+};
+if (saveHtml) { %>
+function saveHtmlFile(filename, actual, done) {
+    fs.writeFile(path.join(__dirname, filename), beautifyHtml(actual), done);
+}<%
+}%>
+it('should be equal `${ it }` by ${ engine.name }${ titleSuffix }', function (<% if (saveHtml || engine.isAsync) { %>done<% } %>) {
+    var bemjson = references['${ it }']${ subreference }.bemjson,
+        expected = references['${ it }']${ subreference }.html;<%
+
+if (saveHtml) {%>
+    var filename = [it, prettifyEngineName(engine.name), 'html'].join('.');
+}<%
+
+if (!engine.isAsync) {%>
+    // sync mode
+    var actual = engines['${ engine.name }']${ subreference }.apply(bemjson);
 
     assertHtml(actual, expected);<%
-    if (saveHtml) {
-        var filename = [it, engine.name, 'html'].join('.'),
-            sep = '\n            ';
 
-        print(sep + 'fs.writeFile(path.join(__dirname, \'' + filename + '\'), beautifyHtml(actual), done);');
-    } %>
+if (saveHtml) {%>
+    saveHtmlFile('${ filename }', actual, done);
+<%}
+
+} else {%>
+    // async mode
+    engines['${ engine.name }']${ subreference }.apply(bemjson, function (errs, actual) {
+        if (errs !== null) {
+            done(errs);
+            return;
+        }
+
+        assertHtml(actual, expected, function (err) {
+            err && done(err);%>
+if (saveHtml) {%>
+            saveHtmlFile('${ filename }', actual, done);
+%>}
+        });
+    });<%
+}%>
 });

lib/assets/tmpl-spec.jst

@@ -2,7 +2,9 @@ var assert = require('assert'),
     path = require('path'),
 <% if (saveHtml) { %>
     fs = require('fs'),
-    beautifyHtml = require('${ paths['js-beautify'] }').html,
+    beautifyHtml = function (html) {
+        return require('${ paths['js-beautify'] }').html(html, beautifyHtmlConfig);
+    },
 <% } %>
     beautifyHtmlConfig = { unformatted: [
     'a', 'span', 'img', 'address', 'script',
@@ -72,9 +74,10 @@ describe('${ it }', function() {
 });<% }); %>
 });
 
-function assertHtml(actual, expected) {
+function assertHtml(actual, expected, done) {
     if (htmlDiffer.isEqual(actual, expected)) {
         assert.ok(actual);
+        done && done(null);
     } else {
         assert.fail(actual, expected, null, '\n');
     }

lib/techs/tmpl-spec.js

@@ -98,6 +98,7 @@ module.exports = require('enb/lib/build-flow').create()
                                     var langTarget = target.replace('.js', '.' + lang + '.js');
                                     return {
                                         name: lang,
+                                        isAsync: engine.options.isAsync,
                                         target: langTarget,
                                         exportName: exportName
                                     };
@@ -107,6 +108,7 @@ module.exports = require('enb/lib/build-flow').create()
 
                         return {
                             name: engine.name,
+                            isAsync: engine.options.isAsync,
                             target: target,
                             exportName: exportName
                         };