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preprocessor.spec.ts
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preprocessor.spec.ts
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import { mocked } from 'jest-mock';
import { getWebpackConfig, preprocessTypescript } from './preprocessor';
jest.mock('@cypress/webpack-preprocessor', () => {
return jest.fn(
() =>
(...args) =>
Promise.resolve()
);
});
jest.mock('tsconfig-paths-webpack-plugin');
import * as wp from '@cypress/webpack-preprocessor';
import TsConfigPathsPlugin from 'tsconfig-paths-webpack-plugin';
const mockWp = mocked(wp);
describe('getWebpackConfig', () => {
beforeEach(() => {
(<any>TsConfigPathsPlugin).mockImplementation(
function MockPathsPlugin() {}
);
});
it('should load typescript', () => {
const config = getWebpackConfig({
env: {
tsConfig: './tsconfig.json',
},
});
expect(config.module.rules).toContainEqual({
test: /\.([jt])sx?$/,
loader: require.resolve('ts-loader'),
exclude: [/node_modules/],
options: {
configFile: './tsconfig.json',
// https://github.com/TypeStrong/ts-loader/pull/685
experimentalWatchApi: true,
transpileOnly: true,
},
});
});
it('should resolve tsconfig paths', () => {
const config = getWebpackConfig({
env: {
tsConfig: './tsconfig.json',
},
});
expect(
config.resolve.plugins.some(
(plugin) => plugin instanceof TsConfigPathsPlugin
)
).toEqual(true);
});
it('should resolve relevant extensions', () => {
const config = getWebpackConfig({
env: {
tsConfig: './tsconfig.json',
},
});
expect(config.resolve.extensions).toEqual([
'.ts',
'.tsx',
'.mjs',
'.js',
'.jsx',
]);
});
it('should keep node_modules external', () => {
const config = getWebpackConfig({
env: {
tsConfig: './tsconfig.json',
},
});
const callback = jest.fn();
config.externals[0](null, '@nestjs/core', callback);
expect(callback).toHaveBeenCalledWith(null, 'commonjs @nestjs/core');
});
});
describe('preprocessTypescript', () => {
it('should work if no customizer is passed', async () => {
const preprocessor = preprocessTypescript({
env: {
tsConfig: './tsconfig.json',
},
});
await preprocessor('arg0');
expect(wp).toBeCalled();
expect(
mockWp.mock.calls[mockWp.mock.calls.length - 1][0].webpackOptions.resolve
.extensions
).toEqual(['.ts', '.tsx', '.mjs', '.js', '.jsx']);
});
it('should support customizing the webpack config', async () => {
const preprocessor = preprocessTypescript(
{
env: {
tsConfig: './tsconfig.json',
},
},
(webpackConfig) => {
webpackConfig.resolve.extensions.push('.mdx');
return webpackConfig;
}
);
await preprocessor('arg0');
expect(wp).toBeCalled();
expect(
mockWp.mock.calls[mockWp.mock.calls.length - 1][0].webpackOptions.resolve
.extensions
).toEqual(['.ts', '.tsx', '.mjs', '.js', '.jsx', '.mdx']);
});
});