chore: supply test (#328)

test/component.test.ts

@@ -15,8 +15,14 @@ describe('Counter.vue', () => {
 
     expect(wrapper.find('.inc').exists()).toBe(true)
 
-    await wrapper.get('button').trigger('click')
+    expect(wrapper.find('.dec').exists()).toBe(true)
+
+    await wrapper.get('.inc').trigger('click')
 
     expect(wrapper.text()).toContain('1')
+
+    await wrapper.get('.dec').trigger('click')
+
+    expect(wrapper.text()).toContain('0')
   })
 })