test: add testcase for ellipsis

components/shared/__tests__/__snapshots__/ellipsis.test.tsx.snap

@@ -0,0 +1,12 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Ellipsis should render correctly 1`] = `
+"<div style=\\"width: 1px;\\"><span>text<style>
+        span {
+          overflow: hidden;
+          text-overflow: ellipsis;
+          white-space: nowrap;
+          min-width: 0;
+        }
+      </style></span></div>"
+`;

components/shared/__tests__/ellipsis.test.tsx

@@ -0,0 +1,15 @@
+import React from 'react'
+import { mount } from 'enzyme'
+import Ellipsis from '../ellipsis'
+
+describe('Ellipsis', () => {
+  it('should render correctly', () => {
+    const wrapper = mount(
+      <div style={{ width: '1px' }}>
+        <Ellipsis>text</Ellipsis>
+      </div>,
+    )
+    expect(wrapper.html()).toMatchSnapshot()
+    expect(() => wrapper.unmount()).not.toThrow()
+  })
+})