tests: add tests for function config

test/config/function/functional-config.test.js

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+'use strict';
+const { resolve } = require('path');
+const { stat } = require('fs');
+const { run } = require('../../utils/test-utils');
+
+describe('functional config', () => {
+    it('should work as expected in case of single config', (done) => {
+        const { stderr, stdout, exitCode } = run(__dirname, ['--config', resolve(__dirname, 'single-webpack.config.js')]);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('./src/index.js');
+        expect(exitCode).toBe(0);
+
+        stat(resolve(__dirname, './bin/dist-single.js'), (err, stats) => {
+            expect(err).toBe(null);
+            expect(stats.isFile()).toBe(true);
+            done();
+        });
+    });
+
+    it('should work as expected in case of multiple config', (done) => {
+        const { stderr, stdout, exitCode } = run(__dirname, ['--config', resolve(__dirname, 'multi-webpack.config.js')]);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('first');
+        expect(stdout).toContain('second');
+        expect(exitCode).toBe(0);
+
+        stat(resolve(__dirname, './bin/dist-first.js'), (err, stats) => {
+            expect(err).toBe(null);
+            expect(stats.isFile()).toBe(true);
+            done();
+        });
+        stat(resolve(__dirname, './bin/dist-second.js'), (err, stats) => {
+            expect(err).toBe(null);
+            expect(stats.isFile()).toBe(true);
+            done();
+        });
+    });
+});

test/config/function/multi-webpack.config.js

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+module.exports = () => [
+    {
+        output: {
+            filename: './dist-first.js',
+        },
+        name: 'first',
+        entry: './src/first.js',
+        mode: 'development',
+        stats: 'minimal',
+    },
+    {
+        output: {
+            filename: './dist-second.js',
+        },
+        name: 'second',
+        entry: './src/second.js',
+        mode: 'production',
+        stats: 'minimal',
+    },
+];

test/config/function/single-webpack.config.js

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+module.exports = () => {
+    return {
+        output: {
+            filename: './dist-single.js',
+        },
+        name: 'single',
+        mode: 'development',
+    };
+};

test/config/function/src/first.js

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+console.log('first entry');

test/config/function/src/index.js

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+console.log('default index');

test/config/function/src/second.js

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+console.log('second entry');