diff --git a/.gitignore b/.gitignore
index 52d85dc..acc0be2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 .idea
+.iml
 node_modules
-*-converted.js
-*.log
+test/test-output
+*.log
\ No newline at end of file
diff --git a/index.js b/index.js
index ddc28c3..4ffcb86 100644
--- a/index.js
+++ b/index.js
@@ -27,7 +27,14 @@ function native2ascii(str) {
 
 
 function ascii2native(str) {
-    return unescape(str.split('\\').join('%'));
+    if(str.indexOf('\\\\u')>-1){
+        // fix err js minify string
+        return ascii2native.call(null, str.replace(/\\(\\u(\w+){4})/g, function (all, key) {
+            return key;
+        }));
+    }else{
+        return unescape(str.split('\\').join('%'));
+    }
 }
 
 
diff --git a/package.json b/package.json
index 5cd046d..ddca520 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "gulp-native2ascii",
   "description": "native2ascii plugin for gulp",
-  "version": "0.0.3",
+  "version": "0.0.4",
   "homepage": "https://github.com/adamme/gulp-native2ascii",
   "author": {
     "name": "Adam Lau",
@@ -29,15 +29,14 @@
     "gulp",
     "native2ascii"
   ],
-    "scripts": {
-        "test": "node test/test.js"
-    },
+  "scripts": {
+    "test": "node test/test.js"
+  },
   "dependencies": {
     "gulp-util": "^2.2.14",
     "through2": "^0.4.1"
   },
   "devDependencies": {
-    "gulp-mocha": "^0.4.1",
-    "gulp-rename": "^1.1.0"
+    "del": "^0.1.3"
   }
 }
diff --git a/test/cases/default.js b/test/cases/default.js
new file mode 100644
index 0000000..21d54d1
--- /dev/null
+++ b/test/cases/default.js
@@ -0,0 +1 @@
+console.log('你好，世界！');
diff --git a/test/cases/errMinify.js b/test/cases/errMinify.js
new file mode 100644
index 0000000..8ec0d38
--- /dev/null
+++ b/test/cases/errMinify.js
@@ -0,0 +1 @@
+console.log('\\u7f16\\u7801\\u8f6c\\u6362');
\ No newline at end of file
diff --git a/test/reverse.js b/test/cases/reverse.js
similarity index 100%
rename from test/reverse.js
rename to test/cases/reverse.js
diff --git a/test/default.js b/test/default.js
deleted file mode 100644
index e48d21e..0000000
--- a/test/default.js
+++ /dev/null
@@ -1 +0,0 @@
-alert('你好，世界！');
diff --git a/test/test.js b/test/test.js
index 1fbe116..229b8a0 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,20 +1,37 @@
-var n2a = require('../');
-var rename = require('gulp-rename');
-var gulp = require('gulp');
+var gulp = require('gulp'),
+    n2a = require('../'),
+    del = require('del');
 
+const TEST_CASE = './test/cases/';
+const OUTPUT = './test/test-output/';
 
-gulp.src('./**/default.js', {buffer: false})
-    .pipe(n2a())
-    .pipe(rename(function (path) {
-              path.basename += "-converted";
-          }))
-    .pipe(gulp.dest('./'));
+/** 1. clean up output files. **/
+del([OUTPUT], function (err) {
+    if (err) {
+        console.error("clean up output files failed.");
+    } else {
+        testCase();
+    }
+});
 
-gulp.src('./**/reverse.js')
-    .pipe(n2a({
-                  reverse: true
-              }))
-    .pipe(rename(function (path) {
-              path.basename += "-converted";
-          }))
-    .pipe(gulp.dest('./'));
+function testCase() {
+    /** 2. convert unicode to ascii. **/
+    gulp.src(TEST_CASE + 'default.js', {buffer: false})
+        .pipe(n2a())
+        .pipe(gulp.dest(OUTPUT));
+
+    /** 3. convert ascii to unicode. **/
+    gulp.src(TEST_CASE + 'reverse.js')
+        .pipe(n2a({
+            reverse: true
+        }))
+        .pipe(gulp.dest(OUTPUT));
+
+    /** 4. fixs error uglify ascii string to unicode **/
+    gulp.src(TEST_CASE + 'errMinify.js')
+        .pipe(n2a({
+            reverse: true
+        }))
+        .pipe(gulp.dest(OUTPUT));
+
+}