Question

我很新来做出反应。我正在编写将在<svg>标签中使用的组件。

我想对这些组件进行测试。但是，我所有的测试都无法识别<svg>的有效子级，例如<path>，<rect>和<circle>等

import React from 'react';
import ReactDOM from 'react-dom';
import { Layout } from './Layout';
import { LayoutAlignmentHorizontal, LayoutAlignmentVertical, LayoutFlow } from './Layout.enum';


it('renders without crashing', () => {
  const svg = document.createElement('svg');
  svg.setAttribute('xmlns','http://www.w3.org/2000/svg');
    ReactDOM.render(<Layout flow={LayoutFlow.COLUMN}
                            horizontalAlignment={LayoutAlignmentHorizontal.LEFT}
                            verticalAlignment={LayoutAlignmentVertical.TOP}>
      <rect width={50} height={50} fill={'red'}/>
      <circle r={15} fill={'blue'} transform="translate(15 15)"/>
      <path transform="scale(.15)"
            d="M 10,30 A 20,20 0,0,1 50,30
               A 20,20 0,0,1 90,30
               Q 90,60 50,90
               Q 10,60 10,30 z"
            fill={'green'}/>
    </Layout>, svg);
  ReactDOM.unmountComponentAtNode(svg);
});

实际：

$ react-scripts test
 FAIL  src/containers/layout/Layout.test.tsx
  ● Console

    console.error node_modules/react-dom/cjs/react-dom.development.js:506
      Warning: The tag <rect> is unrecognized in this browser. If you meant to render a React component, start its name with an uppercase letter.
          in rect (at Layout.test.tsx:11)
          in g (at Layout.tsx:60)
          in g (at Layout.tsx:71)
          in Layout (at Layout.test.tsx:10)
    console.error node_modules/react-dom/cjs/react-dom.development.js:506
      Warning: The tag <g> is unrecognized in this browser. If you meant to render a React component, start its name with an uppercase letter.
          in g (at Layout.tsx:60)
          in g (at Layout.tsx:71)
          in Layout (at Layout.test.tsx:10)
    console.error node_modules/react-dom/cjs/react-dom.development.js:506
      Warning: The tag <circle> is unrecognized in this browser. If you meant to render a React component, start its name with an uppercase letter.
          in circle (at Layout.test.tsx:12)
          in g (at Layout.tsx:60)
          in g (at Layout.tsx:71)
          in Layout (at Layout.test.tsx:10)
    console.error node_modules/react-dom/cjs/react-dom.development.js:506
      Warning: The tag <path> is unrecognized in this browser. If you meant to render a React component, start its name with an uppercase letter.
          in path (at Layout.test.tsx:13)
          in g (at Layout.tsx:60)
          in g (at Layout.tsx:71)
          in Layout (at Layout.test.tsx:10)

预期： svg标签应呈现

Answer 1

我在Jest测试套件中使用SVG组件遇到了这个问题。

FWIW，您只需用<svg>包装该组件即可通过Jest测试：

test('something', () => {
  mount(<svg><MySVGComponent /></svg>)
})

Answer 2

感谢DoMiNeLa10的评论。

React应该呈现<svg>元素，然后才起作用：）

it('renders without crashing', () => {
  const div = document.createElement('div');
    ReactDOM.render(<svg xmlns="http://www.w3.org/2000/svg">
      <Layout flow={LayoutFlow.COLUMN}
                  horizontalAlignment={LayoutAlignmentHorizontal.LEFT}
                  verticalAlignment={LayoutAlignmentVertical.TOP}>
        <rect width={50} height={50} fill={'red'}/>
        <circle r={15} fill={'blue'} transform="translate(15 15)"/>
        <path transform="scale(.15)"
              d="M 10,30 A 20,20 0,0,1 50,30
                 A 20,20 0,0,1 90,30
                 Q 90,60 50,90
                 Q 10,60 10,30 z"
              fill={'green'}/>
      </Layout>
    </svg>, div);
  ReactDOM.unmountComponentAtNode(div);
});

如何测试呈现svg的组件？

2 个答案: