diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..a30f452
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2430 @@
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+      "resolved": "https://registry.npmjs.org/to-double-quotes/-/to-double-quotes-2.0.0.tgz",
+      "integrity": "sha1-qvIx1vqUiUn4GTAburRITYWI5Kc=",
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+      "resolved": "https://registry.npmjs.org/to-iso-string/-/to-iso-string-0.0.2.tgz",
+      "integrity": "sha1-TcGeZk38y+Jb2NtQiwDG2hWCVdE=",
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+      "resolved": "https://registry.npmjs.org/to-single-quotes/-/to-single-quotes-2.0.1.tgz",
+      "integrity": "sha1-fMKRUfD18sQZRvEZ9ZMv5VQXASU=",
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+      "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
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+      "integrity": "sha1-diIXzAbbJY7EiQihKY6LlRIejqI=",
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+      "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
+      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
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+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.8.29.tgz",
+      "integrity": "sha1-KcVzMUgFe7Th913zW3qcty5qWd0=",
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+      "resolved": "https://registry.npmjs.org/uglify-to-browserify/-/uglify-to-browserify-1.0.2.tgz",
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+    },
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+      "integrity": "sha1-nHC/2Babwdy/SGBODwS4tJzenp8=",
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+    },
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+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
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+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
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+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
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+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "dev": true
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+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-3.1.0.tgz",
+      "integrity": "sha1-LIaIjy1OrehQ+jjKf3Ij9yCVFuE=",
+      "dev": true,
+      "dependencies": {
+        "lodash": {
+          "version": "3.10.1",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-3.10.1.tgz",
+          "integrity": "sha1-W/Rejkm6QYnhfUgnid/RW9FAt7Y=",
+          "dev": true
+        }
+      }
+    },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+      "dev": true
+    },
+    "yargs": {
+      "version": "3.10.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
+      "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
+      "dev": true,
+      "optional": true
+    }
+  }
+}
diff --git a/package.json b/package.json
index 5649c89..3d25e8f 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   "author": "Tommy Chen <tommy351@gmail.com> (http://zespia.tw)",
   "maintainers": [
     "Abner Chou <hi@abnerchou.me> (http://abnerchou.me)"
-    ],
+  ],
   "license": "MIT",
   "dependencies": {
     "bluebird": "^3.4.0",
diff --git a/test/index.js b/test/index.js
index 0d654e7..aa99843 100644
--- a/test/index.js
+++ b/test/index.js
@@ -32,8 +32,9 @@ describe('fs', function() {
     return fs.mkdirs(tmpDir);
   });
 
-  after(function() {
-    return fs.rmdir(tmpDir);
+  after(function(done) {
+    fs.rmdir(tmpDir);
+    done();
   });
 
   it('exists()', function() {
@@ -1137,7 +1138,9 @@ describe('fs', function() {
 
     return fs.ensureWriteStream(target).then(function(stream) {
       stream.path.should.eql(target);
-      return fs.rmdir(pathFn.dirname(target));
+      stream.on('finish', function() {
+        return fs.unlink(target);
+      });
     });
   });
 
@@ -1147,7 +1150,7 @@ describe('fs', function() {
     fs.ensureWriteStream(target, function(err, stream) {
       should.not.exist(err);
       stream.path.should.eql(target);
-      fs.rmdir(pathFn.dirname(target), callback);
+      callback();
     });
   });
 
@@ -1156,6 +1159,8 @@ describe('fs', function() {
     var stream = fs.ensureWriteStreamSync(target);
 
     stream.path.should.eql(target);
-    return fs.rmdir(pathFn.dirname(target));
+    stream.on('finish', function() {
+      return fs.rmdir(pathFn.dirname(target));
+    });
   });
 });