test: Rollup - add config tests

Author: vio

test/package/rollup/case-config.js

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+/* eslint-disable @typescript-eslint/no-require-imports */
+const { defineConfig } = require('rollup');
+const webpackStatsPlugin = require('rollup-plugin-webpack-stats');
+
+module.exports = defineConfig({
+  input: 'src/index.js',
+  output: {
+    dir: 'dist',
+  },
+  plugins: [webpackStatsPlugin()],
+});

test/package/rollup/case-config.mjs

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+import { defineConfig } from 'rollup';
+import webpackStatsPlugin from 'rollup-plugin-webpack-stats';
+
+export default defineConfig({
+  input: 'src/index.js',
+  output: {
+    dir: 'dist',
+  },
+  plugins: [webpackStatsPlugin()],
+});

test/package/rollup/case-config.ts

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+import { defineConfig } from 'rollup';
+import webpackStatsPlugin from 'rollup-plugin-webpack-stats';
+
+export default defineConfig({
+  input: 'src/index.js',
+  output: {
+    dir: 'dist',
+  },
+  plugins: [webpackStatsPlugin({})],
+});

test/package/rollup/configs.test.ts

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+import { promisify } from 'node:util';
+import { exec as execCallback} from 'node:child_process';
+import { describe, expect, test } from 'vitest';
+
+const exec = promisify(execCallback);
+
+const testCases = [
+  { type: 'commonjs', run: 'npm run build-commonjs' },
+  { type: 'esm', run: 'npm run build-esm' },
+  { type: 'ts', run: 'npm run build-ts' },
+];
+
+describe('package - rollup configs', () => {
+  testCases.forEach((testCase) => {
+    test(`should build successfully with rollup ${testCase.type} config`, async () => {
+      const { stderr } = await exec(`cross-env NO_COLOR=true ${testCase.run}`);
+
+      expect(stderr).toMatch('Stats saved to dist');
+      expect(stderr).toMatch('created dist in');
+    });
+  });
+});