diff --git a/src/count-down/test/__snapshots__/demo.spec.js.snap b/src/count-down/test/__snapshots__/demo.spec.js.snap
deleted file mode 100644
index 237f2ee09..000000000
--- a/src/count-down/test/__snapshots__/demo.spec.js.snap
+++ /dev/null
@@ -1,35 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`renders demo correctly 1`] = `
-<div>
-  <div>
-    <div class="van-count-down">30:00:00</div>
-  </div>
-  <div>
-    <div class="van-count-down">01 天 06 时 00 分 00 秒</div>
-  </div>
-  <div>
-    <div class="van-count-down">30:00:00:000</div>
-  </div>
-  <div>
-    <div class="van-count-down"><span class="item">6</span> <span class="item">0</span> <span class="item">0</span></div>
-  </div>
-  <div>
-    <div class="van-count-down">03:000</div>
-    <div class="van-grid van-hairline--top">
-      <div class="van-grid-item" style="flex-basis: 33.333333333333336%;">
-        <div class="van-grid-item__content van-grid-item__content--center van-grid-item__content--clickable van-hairline"><i class="van-icon van-icon-play-circle-o van-grid-item__icon">
-            <!----></i><span class="van-grid-item__text">开始</span></div>
-      </div>
-      <div class="van-grid-item" style="flex-basis: 33.333333333333336%;">
-        <div class="van-grid-item__content van-grid-item__content--center van-grid-item__content--clickable van-hairline"><i class="van-icon van-icon-pause-circle-o van-grid-item__icon">
-            <!----></i><span class="van-grid-item__text">暂停</span></div>
-      </div>
-      <div class="van-grid-item" style="flex-basis: 33.333333333333336%;">
-        <div class="van-grid-item__content van-grid-item__content--center van-grid-item__content--clickable van-hairline"><i class="van-icon van-icon-replay van-grid-item__icon">
-            <!----></i><span class="van-grid-item__text">重置</span></div>
-      </div>
-    </div>
-  </div>
-</div>
-`;
diff --git a/src/count-down/test/__snapshots__/index.spec.js.snap b/src/count-down/test/__snapshots__/index.spec.js.snap
new file mode 100644
index 000000000..6a6dc9335
--- /dev/null
+++ b/src/count-down/test/__snapshots__/index.spec.js.snap
@@ -0,0 +1,7 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`complete format prop 1`] = `<div class="van-count-down">01-05-59-59-999</div>`;
+
+exports[`disable auto-start prop 1`] = `<div class="van-count-down">100</div>`;
+
+exports[`incomplate format prop 1`] = `<div class="van-count-down">29-59-59-999</div>`;
diff --git a/src/count-down/test/demo.spec.js b/src/count-down/test/demo.spec.js
deleted file mode 100644
index d647cfabc..000000000
--- a/src/count-down/test/demo.spec.js
+++ /dev/null
@@ -1,4 +0,0 @@
-import Demo from '../demo';
-import demoTest from '../../../test/demo-test';
-
-demoTest(Demo);
diff --git a/src/count-down/test/index.spec.js b/src/count-down/test/index.spec.js
new file mode 100644
index 000000000..eb5226990
--- /dev/null
+++ b/src/count-down/test/index.spec.js
@@ -0,0 +1,151 @@
+import CountDown from '..';
+import { mount, later } from '../../../test/utils';
+
+test('macro task finish event', async () => {
+  const wrapper = mount(CountDown, {
+    propsData: {
+      time: 1
+    }
+  });
+
+  expect(wrapper.emitted('finish')).toBeFalsy();
+  await later(20);
+  expect(wrapper.emitted('finish')).toBeTruthy();
+});
+
+test('micro task finish event', async () => {
+  const wrapper = mount(CountDown, {
+    propsData: {
+      time: 1,
+      millisecond: true
+    }
+  });
+
+  expect(wrapper.emitted('finish')).toBeFalsy();
+  await later(20);
+  expect(wrapper.emitted('finish')).toBeTruthy();
+});
+
+test('macro task re-render', async () => {
+  const wrapper = mount(CountDown, {
+    propsData: {
+      time: 1000,
+      format: 'SSS'
+    }
+  });
+
+  const prevSnapShot = wrapper.html();
+  await later(20);
+  const laterSnapShot = wrapper.html();
+
+  expect(prevSnapShot !== laterSnapShot).toBeTruthy();
+});
+
+test('micro task re-render', async () => {
+  const wrapper = mount(CountDown, {
+    propsData: {
+      time: 100,
+      format: 'SSS',
+      millisecond: true
+    }
+  });
+
+  const prevSnapShot = wrapper.html();
+  await later(20);
+  const laterSnapShot = wrapper.html();
+
+  expect(prevSnapShot !== laterSnapShot).toBeTruthy();
+});
+
+test('disable auto-start prop', async () => {
+  const wrapper = mount(CountDown, {
+    propsData: {
+      time: 100,
+      format: 'SSS',
+      autoStart: false
+    }
+  });
+
+  await later(20);
+  expect(wrapper).toMatchSnapshot();
+});
+
+test('start method', async () => {
+  const wrapper = mount(CountDown, {
+    propsData: {
+      time: 100,
+      format: 'SSS',
+      autoStart: false,
+      millisecond: true
+    }
+  });
+
+  const prevSnapShot = wrapper.html();
+
+  wrapper.vm.start();
+  wrapper.vm.start();
+
+  await later(20);
+
+  const laterShapShot = wrapper.html();
+
+  expect(prevSnapShot !== laterShapShot).toBeTruthy();
+});
+
+test('pause method', async () => {
+  const wrapper = mount(CountDown, {
+    propsData: {
+      time: 100,
+      format: 'SSS',
+      millisecond: true
+    }
+  });
+
+  const prevSnapShot = wrapper.html();
+  wrapper.vm.pause();
+  await later(20);
+  const laterShapShot = wrapper.html();
+
+  expect(prevSnapShot === laterShapShot).toBeTruthy();
+});
+
+test('reset method', async () => {
+  const wrapper = mount(CountDown, {
+    propsData: {
+      time: 100,
+      format: 'SSS',
+      millisecond: true
+    }
+  });
+
+  const prevSnapShot = wrapper.html();
+  await later(20);
+  wrapper.vm.reset();
+  const laterShapShot = wrapper.html();
+
+  expect(prevSnapShot === laterShapShot).toBeTruthy();
+});
+
+test('complete format prop', () => {
+  const wrapper = mount(CountDown, {
+    propsData: {
+      time: 30 * 60 * 60 * 1000 - 1,
+      autoStart: false,
+      format: 'DD-HH-mm-ss-SSS'
+    }
+  });
+
+  expect(wrapper).toMatchSnapshot();
+});
+
+test('incomplate format prop', () => {
+  const wrapper = mount(CountDown, {
+    propsData: {
+      time: 30 * 60 * 60 * 1000 - 1,
+      autoStart: false,
+      format: 'HH-mm-ss-SSS'
+    }
+  });
+
+  expect(wrapper).toMatchSnapshot();
+});