tested fixedZero and isUrl (#2600)

src/utils/utils.test.js

+import { fixedZero, isUrl } from './utils';
+
+describe('fixedZero tests', () => {
+  it('should not pad large numbers', () => {
+    expect(fixedZero(10)).toEqual(10);
+    expect(fixedZero(11)).toEqual(11);
+    expect(fixedZero(15)).toEqual(15);
+    expect(fixedZero(20)).toEqual(20);
+    expect(fixedZero(100)).toEqual(100);
+    expect(fixedZero(1000)).toEqual(1000);
+  });
+
+  it('should pad single digit numbers and return them as string', () => {
+    expect(fixedZero(0)).toEqual('00');
+    expect(fixedZero(1)).toEqual('01');
+    expect(fixedZero(2)).toEqual('02');
+    expect(fixedZero(3)).toEqual('03');
+    expect(fixedZero(4)).toEqual('04');
+    expect(fixedZero(5)).toEqual('05');
+    expect(fixedZero(6)).toEqual('06');
+    expect(fixedZero(7)).toEqual('07');
+    expect(fixedZero(8)).toEqual('08');
+    expect(fixedZero(9)).toEqual('09');
+  });
+
+});
+
+describe('isUrl tests', () => {
+  it('should return false for invalid and corner case inputs', () => {
+    expect(isUrl([])).toBeFalsy();
+    expect(isUrl({})).toBeFalsy();
+    expect(isUrl(false)).toBeFalsy();
+    expect(isUrl(true)).toBeFalsy();
+    expect(isUrl(NaN)).toBeFalsy();
+    expect(isUrl(null)).toBeFalsy();
+    expect(isUrl(undefined)).toBeFalsy();
+    expect(isUrl()).toBeFalsy();
+    expect(isUrl('')).toBeFalsy();
+  });
+
+  it('should return false for invalid URLs', () => {
+    expect(isUrl('foo')).toBeFalsy();
+    expect(isUrl('bar')).toBeFalsy();
+    expect(isUrl('bar/test')).toBeFalsy();
+    expect(isUrl('http:/example.com/')).toBeFalsy();
+    expect(isUrl('ttp://example.com/')).toBeFalsy();
+  });
+
+  it('should return true for valid URLs', () => {
+    expect(isUrl('http://example.com/')).toBeTruthy();
+    expect(isUrl('https://example.com/')).toBeTruthy();
+    expect(isUrl('http://example.com/test/123')).toBeTruthy();
+    expect(isUrl('https://example.com/test/123')).toBeTruthy();
+    expect(isUrl('http://example.com/test/123?foo=bar')).toBeTruthy();
+    expect(isUrl('https://example.com/test/123?foo=bar')).toBeTruthy();
+    expect(isUrl('http://www.example.com/')).toBeTruthy();
+    expect(isUrl('https://www.example.com/')).toBeTruthy();
+    expect(isUrl('http://www.example.com/test/123')).toBeTruthy();
+    expect(isUrl('https://www.example.com/test/123')).toBeTruthy();
+    expect(isUrl('http://www.example.com/test/123?foo=bar')).toBeTruthy();
+    expect(isUrl('https://www.example.com/test/123?foo=bar')).toBeTruthy();
+  });
+
+});