test: add test for string utils

src/install.js

@@ -3,7 +3,7 @@ import * as directives from './directives';
 import * as services from './services';
 import locale from './locale';
 
-const install = (app, options = {}) => {
+export const install = (app, options = {}) => {
   // Setup language, en-US for default
   locale.use(options.locale);
   locale.i18n(options.i18n);
@@ -28,5 +28,3 @@ const install = (app, options = {}) => {
     });
   });
 };
-
-export { install };

src/install.spec.js

@@ -11,6 +11,10 @@ describe('install', () => {
     dSpy = jest.spyOn(app, 'directive');
   });
 
+  it('should have install function', async () => {
+    expect(uiv.install).toEqual(expect.any(Function));
+  });
+
   it('should be able to install with prefix', () => {
     // simulate a Vue.use
     app.use(uiv, { prefix: 'uiv' });

src/utils/string.utils.js

@@ -1,7 +1,7 @@
 export function pad(value, num) {
-  value = value + '';
-  for (let i = num - value.length; i > 0; i--) {
-    value = '0' + value;
+  let res = value.toString();
+  for (let i = num - res.length; i > 0; i--) {
+    res = '0' + res;
   }
-  return value;
+  return res;
 }

src/utils/string.utils.spec.js

@@ -0,0 +1,15 @@
+import * as utils from './string.utils';
+
+describe('string.utils', () => {
+  describe('#pad ', () => {
+    it('should be able to pad string', () => {
+      expect(utils.pad('1', 2)).toEqual('01');
+      expect(utils.pad('01', 2)).toEqual('01');
+      expect(utils.pad('001', 2)).toEqual('001');
+    });
+
+    it('should be able to pad non string', () => {
+      expect(utils.pad(100, 5)).toEqual('00100');
+    });
+  });
+});