examples enhance

* utils for products generator

* load test for each *.test.js file in packages folder

* [test] unit test for utils/common

* refactor all products with productGenerator for all examples

* refactor folder structure

* move component <Code /> to src/components/common
* rename component file name

packages/react-bootstrap-table2-example/test/utils/common.test.js

@@ -0,0 +1,36 @@
+import { productsGenerator } from '../../src/utils/common';
+
+describe('Utils', () => {
+  describe('productsGenerator', () => {
+    const quantity = 2;
+
+    it('should return an array', () => {
+      expect(Array.isArray(productsGenerator())).toBe(true);
+    });
+
+    it('should return 5 products without params', () => {
+      expect(productsGenerator().length).toEqual(5);
+    });
+
+    it('should return an array with given quntity', () => {
+      expect(productsGenerator(quantity).length).toEqual(quantity);
+    });
+
+    describe('when callback is defined', () => {
+      const callback = (value, index) => ({
+        id: index,
+        name: 'react-bootstrap-table-2'
+      });
+
+      it('should return customized products format', () => {
+        const products = productsGenerator(quantity, callback);
+        const product = products[0];
+
+        expect(Array.isArray(products)).toBe(true);
+        expect(products.length).toBe(quantity);
+        expect(product).toHaveProperty('id', 0);
+        expect(product).toHaveProperty('name', 'react-bootstrap-table-2');
+      });
+    });
+  });
+});