WebDriver: Difference between revisions

Revision as of 17:03, 2 January 2020

This page is still a work in progress.

The W3C WebDriver API is a platform and language-neutral interface and wire protocol allowing programs or scripts to control the behavior of a web browser.

Introduction

WebDriver API

WebDriver enables developers to create automated tests that simulate user interaction. This is different from JavaScript unit tests because WebDriver has access to functionality and information that JavaScript running in the browser doesn't, and it can more accurately simulate user events or OS-level events. WebDriver can also manage testing across multiple windows, tabs and webpages in a single test session.

WebDriver UDF

The WebDriver UDF allows to interact with any browser that supports the W3C WebDriver specifications. Supporting multiple browsers via the same code base is now possible with just a few configuration settings.

Requirements

(Last modified: 2019/12/29)

The following UDFs need to be installed - independent of the Browser you try to automate:

One of the following Drivers needs to be installed - depending on the Browser type and version you try to automate:

Browser	Download Link	Latest Version / Date	Comments
Chrome	Google	80.0.3987.16 / 2019.12.19	Follow this link to select the correct version depending on the Chrome version you run!
Edge	Microsoft	81.0.370.0
FireFox	github	0.26 / 2019.10.12	Firefox version ≥ 60 is recommended Note: You must still have the Microsoft Visual Studio redistributable runtime installed on your system for the binary to run. This is a known bug in version 0.26 which the authors weren't able fix for this release.
Internet Explorer	Microsoft
Opera	github	78.0.3904.87 - 2019.11.14	The versioning of OperaDriver matches the Chromium version on which Opera browser is based on.

Limitations

Not all WebDriver functions have been implemented by each browser. To check the status goto the corresponding website below:

Big Picture

How the browser independent and browser dependent parts fit together:

Installation

(Last modified: 2019/12/31)

The following steps are needed to install everything you need to automate your browser:

Download the files listed in section "Requirements"
Move the UDFs to a directory where SciTE and Autoit can find them:
- Json.au3 and BinaryCall.au3 from the JSON UDF
- wd_Core.au3 and wd_helper.au3 from the WebDriver UDF
- WinHttp.au3 and WinHttpConstants.au3 from the WinHttp UDF
Move the browser dependent WebDriver to the same directory:
- chromedriver.exe for Chrome
- geckodriver.exe for Firefox
- msedgedriver.exe for Edge (Chromium) or MicrosoftWebDriver.exe for Edge (EdgeHTML)
Run the installation test script (WD_Demo.au3) and select "DemoNavigation" to validate the installation.
The result (for Firefox) displayed in the DOS window should be similar to the following:

1577745813519   geckodriver     DEBUG   Listening on 127.0.0.1:4444
1577745813744   webdriver::server       DEBUG   -> POST /session {"capabilities": {"alwaysMatch": {"browserName": "firefox", "acceptInsecureCerts":true}}}
1577745813746   geckodriver::capabilities       DEBUG   Trying to read firefox version from ini files
1577745813747   geckodriver::capabilities       DEBUG   Found version 71.0
1577745813757   mozrunner::runner       INFO    Running command: "C:\\Program Files\\Mozilla Firefox\\firefox.exe" "-marionette" "-foreground" "-no-remote" "-profile" "C:\\Users\\xy\\AppData\\Local\\Temp\\rust_mozprofileaWURpD"
1577745813783   geckodriver::marionette DEBUG   Waiting 60s to connect to browser on 127.0.0.1:55184
1577745817392   geckodriver::marionette DEBUG   Connection to Marionette established on 127.0.0.1:55184.
1577745817464   webdriver::server       DEBUG   <- 200 OK {"value":{"sessionId":"925641bf-6c5d-4fe2-a985-02de9b1c7c74","capabilities":{"acceptInsecureCerts":true,"browserName":"firefox","browserVersion":"71.0","moz:accessibilityChecks":false,"moz:buildID":"20191202093317","moz:geckodriverVersion":"0.26.0","moz:headless":false,"moz:processID":50220,"moz:profile":"C:\\Users\\xy\\AppData\\Local\\Temp\\rust_mozprofileaWURpD","moz:shutdownTimeout":60000,"moz:useNonSpecCompliantPointerOrigin":false,"moz:webdriverClick":true,"pageLoadStrategy":"normal","platformName":"windows","platformVersion":"10.0","rotatable":false,"setWindowRect":true,"strictFileInteractability":false,"timeouts":{"implicit":0,"pageLoad":300000,"script":30000},"unhandledPromptBehavior":"dismiss and notify"}}}

Debugging

Debug the WebDriver setup

FireFox

(Last modified: 2019/12/28)

Problem	Solution	Reference
The installation testing script does not start up FireFox and does not display the DOS window for geckodriver. When you manually run the geckodriver in a DOS window you get message "geckodriver: error: An invalid argument was supplied. (os error 10022)"	Run the gecko driver from a local HDD.	Stackoverflow

Debug your Script

FAQ

(Last modified: 2019/12/30)

Connect to a running browser instance

Q: How can I connect to a running browser instance?
A: That's described (for Firefox, but should work similar for other browsers) in this post or in the Github wiki.

References