test: add test for stripTrailingSlash method

Author: ftonato

test/helper.test.ts

@@ -0,0 +1,13 @@
+import { stripTrailingSlash } from '../src/lib/helpers'
+
+test('Strip trailing slash from URL', () => {
+  const URL = 'http://localhost:3000/'
+  const expectedURL = URL.slice(0, -1)
+  expect(stripTrailingSlash(URL)).toBe(expectedURL)
+})
+
+test('Return the original URL if there is no slash at the end', () => {
+  const URL = 'http://localhost:3000'
+  const expectedURL = URL
+  expect(stripTrailingSlash(URL)).toBe(expectedURL)
+})