最近研究单元测试，使用 vue-cli3 新建的项目，然后一直报错，其中错误如下
● Test suite failed to run /Users/lyc/Desktop/study/vue/vue-jest1/tests/unit/about.spec.js:1 ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import "core-js/modules/es6.array.find"; ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ SyntaxError: Unexpected string at ScriptTransformer._transformAndBuildScript (node_modules/jest-runtime/build/script_transformer.js:403:17)Test Suites: 1 failed, 1 passed, 2 totalTests: 1 passed, 1 totalSnapshots: 0 totalTime: 1.14sRan all test suites.npm ERR! code ELIFECYCLEnpm ERR! errno 1npm ERR! vue-jest1@0.1.0 test:unit: `vue-cli-service test:unit`npm ERR! Exit status 1npm ERR! npm ERR! Failed at the vue-jest1@0.1.0 test:unit script.npm ERR! This is probably not a problem with npm. There is likely additional logging output above.npm ERR! A complete log of this run can be found in:npm ERR! /Users/lyc/.npm/_logs/2019-06-19T04_20_25_882Z-debug.log找了很久最终在 https://github.com/vuejs/vue-... 找到解决方案。
需要使用 ./node_modules/jest/bin/jest.js --clearCach 或者 npm jest --clearCach，需要清除缓存？
然后再执行 npm run test:unit， 就可以了。
为了避免每次都需要手动清除，直接加载 package.json文件里，
"scripts": { "serve": "vue-cli-service serve", "build": "vue-cli-service build", "test:e2e": "vue-cli-service test:e2e", "test:unit": "jest --clearCache && vue-cli-service test:unit" },这里添加 jest --ClearCach 即可。