diff --git a/src/count-down/test/__snapshots__/index.legacy.js.snap b/src/count-down/test/__snapshots__/index.legacy.js.snap
deleted file mode 100644
index 24d2499e0..000000000
--- a/src/count-down/test/__snapshots__/index.legacy.js.snap
+++ /dev/null
@@ -1,11 +0,0 @@
-// 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>`;
-
-exports[`milliseconds format S 1`] = `<div class="van-count-down">01-5</div>`;
-
-exports[`milliseconds format SS 1`] = `<div class="van-count-down">01-50</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..6db98621a
--- /dev/null
+++ b/src/count-down/test/__snapshots__/index.spec.js.snap
@@ -0,0 +1,31 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`should format S milliseconds correctly 1`] = `
+<div class="van-count-down">
+  01-5
+</div>
+`;
+
+exports[`should format SS milliseconds correctly 1`] = `
+<div class="van-count-down">
+  01-50
+</div>
+`;
+
+exports[`should format complete time correctly 1`] = `
+<div class="van-count-down">
+  01-05-59-59-999
+</div>
+`;
+
+exports[`should format incomplete time correctly 1`] = `
+<div class="van-count-down">
+  29-59-59-999
+</div>
+`;
+
+exports[`should not start counting when auto-start prop is false 1`] = `
+<div class="van-count-down">
+  100
+</div>
+`;
diff --git a/src/count-down/test/index.legacy.js b/src/count-down/test/index.spec.js
similarity index 68%
rename from src/count-down/test/index.legacy.js
rename to src/count-down/test/index.spec.js
index 6c1f5164e..17c5e27d7 100644
--- a/src/count-down/test/index.legacy.js
+++ b/src/count-down/test/index.spec.js
@@ -1,7 +1,8 @@
+import { nextTick } from 'vue';
 import CountDown from '..';
 import { mount, later } from '../../../test';
 
-test('macro task finish event', async () => {
+test('should emit finish event when finished', async () => {
   const wrapper = mount(CountDown, {
     props: {
       time: 1,
@@ -13,7 +14,7 @@ test('macro task finish event', async () => {
   expect(wrapper.emitted('finish')).toBeTruthy();
 });
 
-test('micro task finish event', async () => {
+test('should emit finish event when finished and millisecond is true', async () => {
   const wrapper = mount(CountDown, {
     props: {
       time: 1,
@@ -26,7 +27,7 @@ test('micro task finish event', async () => {
   expect(wrapper.emitted('finish')).toBeTruthy();
 });
 
-test('macro task re-render', async () => {
+test('should re-render after some time', async () => {
   const wrapper = mount(CountDown, {
     props: {
       time: 1000,
@@ -38,10 +39,10 @@ test('macro task re-render', async () => {
   await later(50);
   const laterSnapShot = wrapper.html();
 
-  expect(prevSnapShot !== laterSnapShot).toBeTruthy();
+  expect(prevSnapShot).not.toEqual(laterSnapShot);
 });
 
-test('micro task re-render', async () => {
+test('should re-render after some time when millisecond is false', async () => {
   const wrapper = mount(CountDown, {
     props: {
       time: 100,
@@ -54,10 +55,10 @@ test('micro task re-render', async () => {
   await later(50);
   const laterSnapShot = wrapper.html();
 
-  expect(prevSnapShot !== laterSnapShot).toBeTruthy();
+  expect(prevSnapShot).not.toEqual(laterSnapShot);
 });
 
-test('disable auto-start prop', async () => {
+test('should not start counting when auto-start prop is false', async () => {
   const wrapper = mount(CountDown, {
     props: {
       time: 100,
@@ -70,7 +71,7 @@ test('disable auto-start prop', async () => {
   expect(wrapper.html()).toMatchSnapshot();
 });
 
-test('start method', async () => {
+test('should start counting after calling the start method', async () => {
   const wrapper = mount(CountDown, {
     props: {
       time: 100,
@@ -83,16 +84,13 @@ test('start method', async () => {
   const prevSnapShot = wrapper.html();
 
   wrapper.vm.start();
-  wrapper.vm.start();
-
   await later(50);
 
   const laterShapShot = wrapper.html();
-
-  expect(prevSnapShot !== laterShapShot).toBeTruthy();
+  expect(prevSnapShot).not.toEqual(laterShapShot);
 });
 
-test('pause method', async () => {
+test('should pause counting after calling the pause method', async () => {
   const wrapper = mount(CountDown, {
     props: {
       time: 100,
@@ -106,27 +104,31 @@ test('pause method', async () => {
   await later(50);
   const laterShapShot = wrapper.html();
 
-  expect(prevSnapShot === laterShapShot).toBeTruthy();
+  expect(prevSnapShot).toEqual(laterShapShot);
 });
 
-test('reset method', async () => {
+test('should reset time after calling the reset method', async () => {
   const wrapper = mount(CountDown, {
     props: {
       time: 100,
       format: 'SSS',
+      autoStart: false,
       millisecond: true,
     },
   });
 
   const prevSnapShot = wrapper.html();
+
+  wrapper.vm.start();
   await later(50);
   wrapper.vm.reset();
+  await nextTick();
   const laterShapShot = wrapper.html();
 
-  expect(prevSnapShot === laterShapShot).toBeTruthy();
+  expect(prevSnapShot).toEqual(laterShapShot);
 });
 
-test('complete format prop', () => {
+test('should format complete time correctly', () => {
   const wrapper = mount(CountDown, {
     props: {
       time: 30 * 60 * 60 * 1000 - 1,
@@ -138,31 +140,7 @@ test('complete format prop', () => {
   expect(wrapper.html()).toMatchSnapshot();
 });
 
-test('milliseconds format SS', () => {
-  const wrapper = mount(CountDown, {
-    props: {
-      time: 1500,
-      autoStart: false,
-      format: 'ss-SS',
-    },
-  });
-
-  expect(wrapper.html()).toMatchSnapshot();
-});
-
-test('milliseconds format S', () => {
-  const wrapper = mount(CountDown, {
-    props: {
-      time: 1500,
-      autoStart: false,
-      format: 'ss-S',
-    },
-  });
-
-  expect(wrapper.html()).toMatchSnapshot();
-});
-
-test('incomplate format prop', () => {
+test('should format incomplete time correctly', () => {
   const wrapper = mount(CountDown, {
     props: {
       time: 30 * 60 * 60 * 1000 - 1,
@@ -174,14 +152,31 @@ test('incomplate format prop', () => {
   expect(wrapper.html()).toMatchSnapshot();
 });
 
-test('pause when unmounted', () => {
-  const wrapper = mount(CountDown);
-  expect(wrapper.vm.counting).toBeTruthy();
-  wrapper.unmount();
-  expect(wrapper.vm.counting).toBeFalsy();
+test('should format SS milliseconds correctly', () => {
+  const wrapper = mount(CountDown, {
+    props: {
+      time: 1500,
+      autoStart: false,
+      format: 'ss-SS',
+    },
+  });
+
+  expect(wrapper.html()).toMatchSnapshot();
 });
 
-test('pause when deactivated', async () => {
+test('should format S milliseconds correctly', () => {
+  const wrapper = mount(CountDown, {
+    props: {
+      time: 1500,
+      autoStart: false,
+      format: 'ss-S',
+    },
+  });
+
+  expect(wrapper.html()).toMatchSnapshot();
+});
+
+test('should pause counting when deactivated', async () => {
   const wrapper = mount({
     template: `
       <keep-alive>
@@ -193,28 +188,18 @@ test('pause when deactivated', async () => {
         render: true,
       };
     },
-    methods: {
-      getCountDown() {
-        return this.$refs.countDown;
-      },
-    },
   });
 
-  const countDown = wrapper.vm.getCountDown();
-  expect(countDown.counting).toBeTruthy();
+  const prevSnapShot = wrapper.html();
+  await wrapper.setData({ render: false });
+  await later(50);
 
-  wrapper.setData({ render: false });
-  expect(countDown.counting).toBeFalsy();
-  wrapper.setData({ render: true });
-  expect(countDown.counting).toBeTruthy();
-
-  countDown.pause();
-  wrapper.setData({ render: false });
-  wrapper.setData({ render: true });
-  expect(countDown.counting).toBeFalsy();
+  await wrapper.setData({ render: true });
+  const laterShapShot = wrapper.html();
+  expect(prevSnapShot).toEqual(laterShapShot);
 });
 
-test('change event', async () => {
+test('should emit change event when counting', async () => {
   const wrapper = mount(CountDown, {
     props: {
       time: 1,
@@ -229,5 +214,6 @@ test('change event', async () => {
     milliseconds: 0,
     minutes: 0,
     seconds: 0,
+    total: 0,
   });
 });