[英]Jest testing with React, Typescript and ES6
I'm having some issues testing a React component written in Typescript(v2.0.3) with Jest(v16.0.1) tests written in ES6. 我在用ES6编写的Jest(v16.0.1)测试用Typescript(v2.0.3)编写的React组件时遇到一些问题。
I'm using the ts-jest(v0.1.8) preprocessor and the relevant part of my package.json looks like 我正在使用ts-jest(v0.1.8)预处理器,并且package.json的相关部分看起来像
"jest": {
"scriptPreprocessor": "<rootDir>/node_modules/ts-jest/preprocessor.js",
"testRegex": "(/__tests__/.*|\\.(test|spec))\\.(ts|tsx|js)$",
"moduleFileExtensions": [
"ts",
"tsx",
"js"
]
}
But when I run the tests I get: 但是当我运行测试时,我得到:
FAIL app/components/__tests__/TestTotalNumberOfTeapots.js
● Test suite failed to run
/Users/aaron/Desktop/teabot_stats/app/components/__tests__/TestTotalNumberOfTeapots.js:1
({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import React from 'react';
^^^^^^
SyntaxError: Unexpected token import
at transformAndBuildScript (node_modules/jest-runtime/build/transform.js:284:10)
Test Suites: 1 failed, 1 total
Tests: 0 total
Snapshots: 0 total
Time: 0.673s
Ran all test suites.
My test looks like 我的测试看起来像
import React from 'react';
import TotalNumberOfTeapots from '../TotalNumberOfTeapots.tsx';
import renderer from 'react-test-renderer';
it('renders correctly', () => {
const tree = renderer.create(
<TotalNumberOfTeapots numberOfTeapots='1' />
).toJSON();
expect(tree).toMatchSnapshot();
});
I assume I need to have a setup where my components are transpiled from Typescript to ES5 using ts-jest and my tests are transpiled from ES6 to ES5 using babel-jest before Jest reads them but I'm not sure how? 我假设我需要一个设置,其中使用ts-jest将组件从Typescript转换为ES5,并使用babel-jest将测试从ES6转换为ES5,然后Jest读取它们,但我不确定如何?
Managed to work this out, needed to write my own preprocessor: 设法解决这个问题,需要编写自己的预处理器:
const tsc = require('typescript');
const babelJest = require('babel-jest');
module.exports = {
process(src, path) {
if (path.endsWith('.ts') || path.endsWith('.tsx')) {
return tsc.transpile(
src,
{
module: tsc.ModuleKind.CommonJS,
jsx: tsc.JsxEmit.React,
},
path,
[]
);
}
if (path.endsWith('.js') || path.endsWith('.jsx')) {
return babelJest.process(src, path);
}
return src;
},
};
And update my package.json to have: 并将我的package.json更新为:
"jest": {
"scriptPreprocessor": "preprocessor.js",
"moduleFileExtensions": ["js", "jsx", "json", "ts", "tsx"]
},
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