test(integration): add module federation test

Cherry-picked from webpack#2723.

Co-authored-by: Loonride <knagaitsev1@gmail.com>

test/fixtures/module-federation-config/entry1.js

@@ -0,0 +1,3 @@
+'use strict';
+
+module.exports = 'entry1';

test/fixtures/module-federation-config/entry2.js

@@ -0,0 +1,3 @@
+'use strict';
+
+module.exports = 'entry2';

test/fixtures/module-federation-config/webpack.config.js

@@ -0,0 +1,15 @@
+'use strict';
+
+module.exports = {
+  mode: 'development',
+  target: 'node',
+  context: __dirname,
+  entry: ['./entry1.js', './entry2.js'],
+  output: {
+    path: '/',
+    libraryTarget: 'umd',
+  },
+  infrastructureLogging: {
+    level: 'warn',
+  },
+};

test/fixtures/module-federation-config/webpack.multi.config.js

@@ -0,0 +1,17 @@
+'use strict';
+
+module.exports = [
+  {
+    mode: 'development',
+    target: 'node',
+    context: __dirname,
+    entry: ['./entry1.js', './entry2.js'],
+    output: {
+      path: '/',
+      libraryTarget: 'umd',
+    },
+    infrastructureLogging: {
+      level: 'warn',
+    },
+  },
+];

test/fixtures/module-federation-config/webpack.object-entry.config.js

@@ -0,0 +1,18 @@
+'use strict';
+
+module.exports = {
+  mode: 'development',
+  target: 'node',
+  context: __dirname,
+  entry: {
+    foo: './entry1.js',
+    main: ['./entry1.js', './entry2.js'],
+  },
+  output: {
+    path: '/',
+    libraryTarget: 'umd',
+  },
+  infrastructureLogging: {
+    level: 'warn',
+  },
+};

test/integration/ModuleFederation.test.js

@@ -0,0 +1,55 @@
+'use strict';
+
+const request = require('supertest');
+const requireFromString = require('require-from-string');
+const testServer = require('../helpers/test-server');
+const simpleConfig = require('../fixtures/module-federation-config/webpack.config');
+const objectEntryConfig = require('../fixtures/module-federation-config/webpack.object-entry.config');
+const multiConfig = require('../fixtures/module-federation-config/webpack.multi.config');
+const port = require('../ports-map').ModuleFederation;
+
+describe('module federation', () => {
+  describe.each([
+    ['simple multi-entry config', simpleConfig],
+    ['object multi-entry config', objectEntryConfig],
+    ['multi compiler config', multiConfig],
+  ])('%s', (title, config) => {
+    let server;
+    let req;
+
+    beforeAll((done) => {
+      server = testServer.start(config, { port }, done);
+      req = request(server.app);
+    });
+
+    afterAll(testServer.close);
+
+    it('should use the last entry export', async () => {
+      const { text, statusCode } = await req.get('/main.js');
+      expect(statusCode).toEqual(200);
+      expect(text).toContain('entry1');
+
+      let exports;
+      expect(() => {
+        exports = requireFromString(text);
+      }).not.toThrow();
+
+      expect(exports).toEqual('entry2');
+    });
+
+    if (title === 'object multi-entry config') {
+      it('should support the named entry export', async () => {
+        const { text, statusCode } = await req.get('/foo.js');
+        expect(statusCode).toEqual(200);
+        expect(text).not.toContain('entry2');
+
+        let exports;
+        expect(() => {
+          exports = requireFromString(text);
+        }).not.toThrow();
+
+        expect(exports).toEqual('entry1');
+      });
+    }
+  });
+});

test/ports-map.js

@@ -44,6 +44,7 @@ const portsList = {
   'static-publicPath-option': 1,
   'contentBasePublicPath-option': 1,
   bundle: 1,
+  ModuleFederation: 1,
 };
 
 let startPort = 8089;