Jest single test style problem [identity obj proxy] NPM package

background ：

In the use of jest Single measurement time , Due to the existence of less file , Cause single test failure

 

 

Processing mode ：

1、identity-obj-proxy

Use this npm combination jest To configure , You can delegate styles .

jest Two forms of configuration ：

（1） A separate jest The configuration file

Configure the content ：

module.exports = {
    'moduleNameMapper': {
        '\\.(css|less)$': 'identity-obj-proxy',
    },
};

（2） Directly in package.json To configure

    "jest": {
        "moduleNameMapper": {
            "\\.(css|less)$": "identity-obj-proxy"
        }
    }

 2、 establish mock file

Use webpack · Jest

rootDir: be relative to package.json Path to file

module.exports = {
    'moduleNameMapper': {
        '\\.(css|less)$': '<rootDir>/__mocks__/styleMock.js',
    },
};