React-Native升级后，Jest中的代码覆盖范围错误

Question

我只是将我的项目从react 0.53.3升级到0.57.3。升级后，我的笑话测试不再通过，因为不再达到我的覆盖范围阈值。就我而言，这绝对是配置错误，但是我无法弄清楚为了解决该问题必须进行哪些调整。对于此问题，我提出了最简单的文件来解决。问题发生在我的整个项目中，但是我无法真正分享整个事情。

任何帮助将不胜感激。谢谢！

例如依赖项

{
  "dependencies": {
    "prop-types": "15.6.2",
    "react": "16.6.0-alpha.8af6728",
    "react-native": "0.57.3"
  },
  "devDependencies": {
    "babel-cli": "6.26.0",
    "babel-eslint": "10.0.1",
    "babel-jest": "23.6.0",
    "babel-polyfill": "6.26.0",
    "babel-preset-react-native": "^4.0.1",
    "eslint": "5.7.0",
    "jest": "23.6.0",
    "jest-cli": "23.6.0",
    "metro-react-native-babel-preset": "0.48.1",
    "react-test-renderer": "16.6.0-alpha.8af6728"
  }
}

Jest Config

{
  "jest": {
    "transform": {
      "^.+\\.(js)$": "<rootDir>/node_modules/react-native/jest/preprocessor.js"
    },
    "coverageDirectory": "./coverage/jest",
    "collectCoverage": true,
    "collectCoverageFrom": [
      "src/components/**/*.js",
      "src/lib/components/**/*.js",
    ],
    "coverageThreshold": {
      "global": {
        "statements": 90,
        "branches": 90,
        "functions": 90,
        "lines": 90
      }
    },
    "preset": "react-native"
  }
}

测试文件

import 'react-native';
import React from 'react';
import renderer from 'react-test-renderer';
import H1 from '../../../../src/lib/components/H1';

describe('H1', () => {
  it('should render correctly', () => {
    const tree = renderer.create(<H1>Title</H1>).toJSON();
    expect(tree).toMatchSnapshot();
  });
});

已测试文件

import React, { Component } from 'react';
import PropTypes from 'prop-types';

import Text from '../../containers/TextContainer.js';
import { TEXT_LIGHT } from '../colors';

export default class H1 extends Component {
  static propTypes = {
    children: PropTypes.node.isRequired,
    color: PropTypes.string,
  }

  static defaultProps = {
    color: TEXT_LIGHT,
  }

  render() {
    return (
      <Text
        color={this.props.color}
        fontSizeRatio={3.4}
      >
        {this.props.children}
      </Text>
    );
  }
}

文件的覆盖范围结果

• 声明：83.87％
• 分支机构：60.78％
• 功能：86.67％
• 行：100％
• 未发现的行数：24（从“ ../colors”中导入{TEXT_LIGHT}；）

预期行为

在大多数文件中，我的代码覆盖率在所有类别中均应为100％。