tests: add tests for entry in config

test/entry/config-entry/entry-with-index/entry-with-config.test.js

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+'use strict';
+const { join } = require('path');
+const { existsSync } = require('fs');
+const { run } = require('../../../utils/test-utils');
+
+describe('default entry and config entry all exist', () => {
+    it('should use config entry if config entry existed', () => {
+        const { stdout, stderr } = run(__dirname, [], false);
+        // Should contain the relevant entry
+        expect(stdout).toContain('./src/app.js');
+        expect(stdout).toContain('./src/print.js');
+
+        // Should contain the relevant bundle
+        expect(stdout).toContain('app.bundle.js');
+        expect(stdout).toContain('print.bundle.js');
+        expect(stdout).not.toContain('index.js');
+        // Should only generate the files as per the entry in config
+        expect(existsSync(join(__dirname, '/dist/app.bundle.js'))).toBeTruthy();
+        expect(existsSync(join(__dirname, '/dist/print.bundle.js'))).toBeTruthy();
+        // index fallback should not be used even when the file is present
+        expect(existsSync(join(__dirname, '/dist/index.bundle.js'))).toBeFalsy();
+        expect(stderr).toBeFalsy();
+    });
+});

test/entry/config-entry/entry-with-index/src/app.js

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+console.log('app');

test/entry/config-entry/entry-with-index/src/index.js

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+console.log('index')

test/entry/config-entry/entry-with-index/src/print.js

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+console.log('print');

test/entry/config-entry/entry-with-index/webpack.config.js

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+const path = require('path');
+
+module.exports = {
+    mode: 'development',
+    entry: {
+        app: './src/app.js',
+        print: './src/print.js',
+    },
+    output: {
+        filename: '[name].bundle.js',
+        path: path.resolve(__dirname, 'dist'),
+    },
+};