test: add test for isExternal

Author: sy-records

test/unit/core-util.test.js

@@ -60,10 +60,8 @@ describe('core/util', () => {
  expect(result).toBeTruthy();
  });
 
- test('external url with two \\ ', () => {
- const result = isExternal(
- '/\\\\example.github.io/docsify/demo.md'
- );
+ test('external url with two \\', () => {
+ const result = isExternal('/\\\\example.github.io/docsify/demo.md');
 
  expect(result).toBeTruthy();
  });