fix: join base url and relative path with a single slash (#5738)

Playwright amOnPage produced https://host/app///path whenever the base url
ended with a slash, and Puppeteer/WebDriver concatenated without any
separator. Route all of them through appendBaseUrl and fix its trimUrl,
which never stripped the leading slash.

Co-authored-by: DavertMik <davert@testomat.io>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: 3 people

lib/helper/Playwright.js

@@ -27,6 +27,7 @@ import {
   normalizeSpacesInString,
   normalizePath,
   resolveUrl,
+  appendBaseUrl,
   relativeDir,
   getMimeType,
   base64EncodeFile,
@@ -1365,7 +1366,7 @@ class Playwright extends Helper {
     }
 
     if (!/^\w+\:(\/\/|.+)/.test(url)) {
-      url = this.options.url + (!this.options.url.endsWith('/') && url.startsWith('/') ? url : `/${url}`)
+      url = appendBaseUrl(this.options.url, url)
       this.debug(`Changed URL to base url + relative path: ${url}`)
     }
 
@@ -3124,7 +3125,7 @@ class Playwright extends Helper {
 
     if (url.startsWith('/')) {
       // local url
-      url = this.options.url + url
+      url = appendBaseUrl(this.options.url, url)
       this.debugSection('URL', url)
     }
 

lib/helper/Puppeteer.js

@@ -30,6 +30,7 @@ import {
   normalizeSpacesInString,
   normalizePath,
   resolveUrl,
+  appendBaseUrl,
   getMimeType,
   base64EncodeFile,
 } from '../utils.js'
@@ -751,7 +752,7 @@ class Puppeteer extends Helper {
    */
   async amOnPage(url) {
     if (!/^\w+\:\/\//.test(url)) {
-      url = this.options.url + url
+      url = appendBaseUrl(this.options.url, url)
     }
 
     if (this.options.basicAuth && this.isAuthenticated !== true) {

lib/helper/WebDriver.js

@@ -27,6 +27,7 @@ import {
   modifierKeys,
   normalizePath,
   resolveUrl,
+  appendBaseUrl,
   getMimeType,
   base64EncodeFile,
 } from '../utils.js'
@@ -1063,7 +1064,7 @@ class WebDriver extends Helper {
     let split_url
     if (this.options.basicAuth) {
       if (url.startsWith('/')) {
-        url = this.options.url + url
+        url = appendBaseUrl(this.options.url, url)
       }
       split_url = url.split('//')
       url = `${split_url[0]}//${this.options.basicAuth.username}:${this.options.basicAuth.password}@${split_url[1]}`

lib/utils.js

@@ -372,11 +372,7 @@ function shouldAppendBaseUrl(url) {
 }
 
 function trimUrl(url) {
-  const firstChar = url.substr(1)
-  if (firstChar === '/') {
-    url = url.slice(1)
-  }
-  return url
+  return url.replace(/^\/+/, '')
 }
 
 function joinUrl(baseUrl, url) {
@@ -390,11 +386,7 @@ export const appendBaseUrl = function (baseUrl = '', oneOrMoreUrls) {
   if (!(typeof oneOrMoreUrls === 'string' || Array.isArray(oneOrMoreUrls))) {
     throw new Error(`Expected type of Urls is 'string' or 'array', Found '${typeof oneOrMoreUrls}'.`)
   }
-  // Remove '/' if it's at the end of baseUrl
-  const lastChar = baseUrl.substr(-1)
-  if (lastChar === '/') {
-    baseUrl = baseUrl.slice(0, -1)
-  }
+  baseUrl = baseUrl.replace(/\/+$/, '')
 
   if (!Array.isArray(oneOrMoreUrls)) {
     return joinUrl(baseUrl, oneOrMoreUrls)

test/unit/utils_test.js

@@ -47,6 +47,25 @@ describe('utils', () => {
     })
   })
 
+  describe('#appendBaseUrl', () => {
+    it('should join base url and path with a single slash', () => {
+      expect(utils.appendBaseUrl('http://localhost', '/login')).equal('http://localhost/login')
+      expect(utils.appendBaseUrl('http://localhost', 'login')).equal('http://localhost/login')
+      expect(utils.appendBaseUrl('http://localhost/', '/login')).equal('http://localhost/login')
+      expect(utils.appendBaseUrl('http://localhost/', 'login')).equal('http://localhost/login')
+    })
+
+    it('should keep the path of the base url', () => {
+      expect(utils.appendBaseUrl('http://localhost/app/', '/')).equal('http://localhost/app/')
+      expect(utils.appendBaseUrl('http://localhost/app/', '/login')).equal('http://localhost/app/login')
+      expect(utils.appendBaseUrl('http://localhost/app', '?q=1')).equal('http://localhost/app/?q=1')
+    })
+
+    it('should not touch absolute urls', () => {
+      expect(utils.appendBaseUrl('http://localhost', 'https://example.com/a')).equal('https://example.com/a')
+    })
+  })
+
   describe('#beautify', () => {
     it('should beautify JS code', () => {
       expect(utils.beautify('module.exports = function(a, b) { a++; b = a; if (a == b) { return 2 }};')).eql(`module.exports = function(a, b) {