[Bug]: By.ClassName selector for IOS Driver not working as expected

[tahmeednabi]

Description

I am trying to find an element by classname, with code as shown below:

_driver = new IOSDriver(serverUri, driverOptions);
var UserNameElement = _driver.FindElement(By.ClassName("XCUIElementTypeTextField"));

However, I get an error during test run:

Error Message:
   OpenQA.Selenium.InvalidSelectorException : Unsupported CSS selector '.XCUIElementTypeTextField'. Reason: ''[object Object].XCUIElementTypeTextField'
      is not a valid ios class. Must be a single string (e.g.: XCUIElementTypeWindow) without
      dots separating them'; For documentation on this error, please visit: https://www.selenium.dev/documentation/webdriver/troubleshooting/errors#invalid-selector-exception

For some reason, there is an [object Object] interpolated into the string selection. I think this may be a bug in the By.ClassName selector code.

Environment

• .NET Appium Client 5.0.0
• Appium 2.10.3
• macOS
• Node.js version 18
• iOS 17
• Simulator

Details

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Exception stack traces

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
I am in Login Test method 
test passed web element click
  Failed LoginTest [5 s]
  Error Message:
   OpenQA.Selenium.InvalidSelectorException : Unsupported CSS selector '.XCUIElementTypeTextField'. Reason: ''[object Object].XCUIElementTypeTextField'
      is not a valid ios class. Must be a single string (e.g.: XCUIElementTypeWindow) without
      dots separating them'; For documentation on this error, please visit: https://www.selenium.dev/documentation/webdriver/troubleshooting/errors#invalid-selector-exception
  Stack Trace:
     at OpenQA.Selenium.WebDriver.UnpackAndThrowOnError(Response errorResponse, String commandToExecute)
   at OpenQA.Selenium.WebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)
   at OpenQA.Selenium.Appium.AppiumDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)
   at OpenQA.Selenium.WebDriver.FindElement(String mechanism, String value)
   at OpenQA.Selenium.By.<.ctor>b__11_0(ISearchContext context)
   at OpenQA.Selenium.By.FindElement(ISearchContext context)
   at OpenQA.Selenium.WebDriver.FindElement(By by)
   at OpenQA.Selenium.Appium.AppiumDriver.FindElement(By by)
   at fpa.BaseTests.LoginTest() in /Users/tahmeednabi/Desktop/Projects/fpa-test-automation-mobile/fpa-test-automation-mobile/src/Tests/BaseTests.cs:line 60
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)

Link to Appium logs

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[Dor-bl]

Does other class name values work for you?

[tahmeednabi]

Does other class name values work for you?

No, unfortunately any string I put in the By.ClassName method gives me the same error

[Dor-bl]

@tahmeednabi
By.ClassName is a Selenium Selector.
For Appium you should be using: MobileBy.ClassName

[tahmeednabi]

Ah, silly me! Thank you!