diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..cca1794
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,12 @@
+language: node_js
+
+node_js:
+  - "4.4.3"
+  - "5.11.0"
+  - "6.1"
+
+before_script:
+  - npm install
+
+script:
+  - npm run test
\ No newline at end of file
diff --git a/cli.js b/cli.js
index 7314957..06385a2 100755
--- a/cli.js
+++ b/cli.js
@@ -1,4 +1,3 @@
-#!/usr/bin/env node
 'use strict';
 
 const glob = require('glob');
@@ -9,15 +8,6 @@ const sh = require('shelljs');
 const mkdirp = require('mkdirp');
 const convert = require('./convert');
 
-const ARGS = yargs
-  .describe('output', 'Output file')
-  .describe('version', 'Print version number and exit')
-  .help('help')
-  .alias('o', 'output')
-  .alias('h', 'help')
-  .alias('v', 'version')
-  .argv;
-
 const cwd = sh.pwd().toString();
 
 const convertAndWrite = (file, outputPath) => {
@@ -27,49 +17,67 @@ const convertAndWrite = (file, outputPath) => {
     output = convert(output);
   } catch ( e ) {
     console.error('ERROR: convert error. Input code is too complex to convert.');
-    process.exit(1);
+    return 1;
   }
   const outputDir = path.join(cwd, '/' + outputPath);
   mkdirp(outputPath);
   fs.writeFileSync(outputDir + path.basename(file), output);
+  return 0;
 };
 
-if (ARGS.version || ARGS.v) {
-  const json = require('./package.json');
-  console.log(json.name + ' ' + json.version);
-  process.exit(0);
-}
-
-
-if (ARGS._[0]) {
-  const input = ARGS._[0];
-  let output = undefined;
-  if (ARGS.output || ARGS.o) {
-    output = ARGS.output || ARGS.o;
-  } else {
-    console.error('ERROR: Invalid output');
-    process.exit(1);
+const cli = (args) => {
+  if (typeof args === 'undefined') {
+    return 1;
   }
-  if (fs.existsSync(input)) {
-    convertAndWrite(input, output);
-    process.exit(0);
+  if (typeof args !== 'object') {
+    return 1;
   }
-  glob(input, (err, files) => {
-    if (err) {
-      console.error('ERROR: Invalid glob definition');
-      process.exit(1);
+  yargs
+    .describe('output', 'Output file')
+    .describe('version', 'Print version number and exit')
+    .help('help')
+    .alias('o', 'output')
+    .alias('h', 'help')
+    .alias('v', 'version');
+
+  if (args.version || args.v) {
+    const json = require('./package.json');
+    console.log(json.name + ' ' + json.version);
+    return 0;
+  }
+
+
+  if (args._[0]) {
+    const input = args._[0];
+    let output = undefined;
+    if (args.output || args.o) {
+      output = args.output || args.o;
+    } else {
+      console.error('ERROR: Invalid output');
+      return 1;
     }
-    for (let file of files) {
-      convertAndWrite(file, output);
+    if (fs.existsSync(input)) {
+      return convertAndWrite(input, output);
     }
-  });
-  process.exit(0);
-}
+    glob(input, (err, files) => {
+      if (err) {
+        console.error('ERROR: Invalid glob definition');
+        return 1;
+      }
+      for (let file of files) {
+        convertAndWrite(file, output);
+      }
+    });
+    return 0;
+  }
 
-if ((ARGS.output || ARGS.o) && !ARGS._[0]) {
-  console.error('ERROR: Invalid input');
-  process.exit(1);
-}
+  if ((args.output || args.o) && !args._[0]) {
+    console.error('ERROR: Invalid input');
+    return 1;
+  }
+
+  console.log('Usage: kaomojify <input> -o <output>');
+  return 0;
+};
 
-console.log('Usage: kaomojify <input> -o <output>');
-process.exit(0);
\ No newline at end of file
+module.exports = cli;
\ No newline at end of file
diff --git a/cli.test.js b/cli.test.js
new file mode 100644
index 0000000..5ae99db
--- /dev/null
+++ b/cli.test.js
@@ -0,0 +1,30 @@
+'use strict';
+
+const assert = require('power-assert');
+const cli = require('./cli');
+
+const buildArgs = (str) => {
+  let args = new Object();
+  args._ = [];
+  args[str] = true;
+  return args;
+};
+
+describe('cli', () => {
+
+  describe('options', () => {
+  	
+    it('throw error of run `kaomojify` (empty)', () => {
+      assert.strictEqual(cli(), 1);
+    });
+
+    it('no error of run `kaomojify -v`', () => {
+      assert.strictEqual(cli(buildArgs('-v')), 0);
+    });
+
+    it('no error of run `kotori -h`', () => {
+      assert.strictEqual(cli(buildArgs('-h')), 0);
+    });
+
+  });
+});
diff --git a/convert.js b/convert.js
index 9d9b702..5f10da4 100644
--- a/convert.js
+++ b/convert.js
@@ -1,6 +1,6 @@
-'use strict';
-
 module.exports = (text) => {
+  'use strict';
+  
   let t;
   const b = [
     "(c^_^o)",
diff --git a/kaomojify.js b/kaomojify.js
new file mode 100755
index 0000000..a32c94b
--- /dev/null
+++ b/kaomojify.js
@@ -0,0 +1,11 @@
+#!/usr/bin/env node
+'use strict';
+
+const yargs = require('yargs');
+const cli = require('./cli');
+
+const exitCode = cli(yargs.argv);
+
+process.on('exit', () => {
+  process.exit(exitCode);
+});
\ No newline at end of file
diff --git a/package.json b/package.json
index 616dda5..293fe9f 100644
--- a/package.json
+++ b/package.json
@@ -1,14 +1,10 @@
 {
   "name": "kaomojify",
-  "version": "0.1.4",
+  "version": "0.2.0",
   "description": "Kaomojify Javascript code",
   "main": "",
   "bin": {
-    "kaomojify": "./cli.js"
-  },
-  "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
-    "lint": "eslint ./"
+    "kaomojify": "./kaomojify.js"
   },
   "repository": {
     "type": "git",
@@ -23,14 +19,20 @@
     "url": "https://github.com/kokororin/kaomojify/issues"
   },
   "homepage": "https://github.com/kokororin/kaomojify#readme",
-  "devDependencies": {
-    "eslint": "^3.5.0",
-    "eslint-config-crocodile": "^1.0.0"
-  },
   "dependencies": {
     "glob": "^7.0.6",
     "mkdirp": "^0.5.1",
     "shelljs": "^0.7.4",
     "yargs": "^5.0.0"
+  },
+  "devDependencies": {
+    "eslint": "^3.5.0",
+    "eslint-config-crocodile": "^1.0.0",
+    "mocha": "^3.0.2",
+    "power-assert": "^1.4.1"
+  },
+  "scripts": {
+    "test": "mocha ./*.test.js",
+    "lint": "eslint ./"
   }
 }