diff --git a/__tests__/index.js b/__tests__/index.js
new file mode 100644
index 0000000..3c4bfcf
--- /dev/null
+++ b/__tests__/index.js
@@ -0,0 +1,27 @@
+import money from '../';
+
+describe('money', () => {
+  test('add', () => {
+    expect(money('2.51').add('0.01').toString()).toBe('2.52');
+  });
+
+  test('sub', () => {
+    expect(money('2.52').sub('0.01').toString()).toBe('2.51');
+  });
+
+  test('mul', () => {
+    expect(money('2.52').mul('6').toString()).toBe('15.12');
+  });
+
+  test('div', () => {
+    expect(money('2.52').div('3').toString()).toBe('0.84');
+  });
+
+  test('manipulate object', () => {
+    expect(money('2.51').add(money('0.01')).toString()).toBe('2.52');
+  });
+
+  test('remove ending zero', () => {
+    expect(money('2.51').sub(money('0.01')).toString()).toBe('2.5');
+  });
+});
diff --git a/babel.config.js b/babel.config.js
new file mode 100644
index 0000000..43e6959
--- /dev/null
+++ b/babel.config.js
@@ -0,0 +1,5 @@
+module.exports = {
+  presets: [
+    'babel-preset-miaoxing',
+  ],
+};
diff --git a/package.json b/package.json
index 2684d5e..5960faa 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,9 @@
   "jest": {
     "preset": "jest-preset-miaoxing"
   },
-  "dependencies": {},
+  "dependencies": {
+    "currency.js": "^2.0.4"
+  },
   "devDependencies": {
     "@miaoxing/dev": "^7.0.1"
   }