[js]: Fix sendKeys command fail on FileDetector.handleFile error.

[garg3133]

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Description

When using the .sendKeys command with a file detector, if the promise returned by the handleFile method of file detector results in a rejection, the control moves to the catch clause and then to the last this.execute_ function call.

Now, the problem with this flow is that in case of the handleFile error, the keys variable remains an Array as opposed to it being converted to a string if handleFile runs without any error. But, the last this.execute_ function call expects keys to be a string.

This results in keys.split is not a function error when the flow goes through the catch() clause.

So, this PR fixes this issue by converting keys to string if the flow goes through the catch clause so that the last this.execute_ always receives keys in a string format, as expected.

Motivation and Context

One of the Nightwatch.js users is facing an issue due to this: nightwatchjs/nightwatch#4280. They are using a remote file detector (new require('selenium-webdriver/remote').FileDetector()) in their test and when they try to send a large block of text to a text input using the .sendKeys command, they are getting the keys.split is not a function error

Please check this comment for more detailed analysis. tl;dr: Sending long text using .sendKeys with the file detector enabled leads to ENAMETOOLONG error which is not handled by the remote file detector's handleFile method, causing the method to be rejected, due to which the control flow lands inside the catch() clause in webdriver.js > sendKeys with keys variable still an Array, and using the .split method on an Array leads to the keys.split is not a function error.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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PR Type

Bug fix, Tests

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Description

• Fixed a bug in the sendKeys command where an error in handleFile would cause a keys.split is not a function error by ensuring keys is converted to a string in the catch block.
• Added a new test case to verify the behavior of sendKeys when the file detector's handleFile method rejects, ensuring robust error handling.

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Changes walkthrough 📝

	Relevant files
Bug fix	webdriver.js Fix `sendKeys` command to handle file detector errors correctly javascript/node/selenium-webdriver/lib/webdriver.js Added a line to convert keys to a string in the catch block. Ensures keys is always a string before calling this.execute_. +1/-0
Tests	webdriver_test.js Add test for `sendKeys` handling file detector errors        javascript/node/selenium-webdriver/test/lib/webdriver_test.js Added a new test case for sendKeys with a file detector handling errors. Ensures the sendKeys function behaves correctly when handleFile rejects. +26/-0

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ❌ 4280 - Not compliant Not compliant requirements: Fix the issue where calling location_once_scrolled_into_view before click() causes the wrong element to be clicked Ensure that location_once_scrolled_into_view does not change the element being interacted with

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Error Handling The added line converts keys to a string in the catch block, but it's unclear if this fully addresses the original issue or if it might introduce new problems.

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PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Score
Best practice	Improve test robustness by explicitly asserting the expected rejection Consider using a more specific assertion method like assert.rejects() to test for the rejected promise, ensuring the error is handled correctly. javascript/node/selenium-webdriver/test/lib/webdriver_test.js [959] -return driver.findElement(By.id('foo')).sendKeys('original/', 'path') +return assert.rejects( + () => driver.findElement(By.id('foo')).sendKeys('original/', 'path'), + /unhandled file error/ +) Apply this suggestion Suggestion importance[1-10]: 9 Why: Using assert.rejects() explicitly tests for promise rejections, ensuring that the test accurately verifies the error handling behavior. This is a best practice for testing asynchronous code and enhances test reliability.	9
Possible issue	Improve robustness by checking if keys is an array before joining Consider using Array.isArray() to check if keys is an array before calling join(). This ensures the code works correctly even if keys is not an array. javascript/node/selenium-webdriver/lib/webdriver.js [2755] -keys = keys.join('') +keys = Array.isArray(keys) ? keys.join('') : keys Apply this suggestion Suggestion importance[1-10]: 8 Why: This suggestion enhances the robustness of the code by ensuring that keys is an array before calling join(). This prevents potential runtime errors if keys is not an array, making the code more reliable.	8
Enhancement	Enhance error logging by including the full error object Consider logging the full error object instead of just concatenating it to the string. This will provide more detailed error information for debugging. javascript/node/selenium-webdriver/lib/webdriver.js [2754] -this.log_.severe('Error trying parse string as a file with file detector; sending keys instead' + ex) +this.log_.severe('Error trying parse string as a file with file detector; sending keys instead', ex) Apply this suggestion Suggestion importance[1-10]: 7 Why: Logging the full error object provides more detailed information for debugging, which can be crucial for diagnosing issues. This suggestion improves the quality of error logging without altering the core functionality.	7

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[garg3133]

cc: @harsha509 @pujagani

[harsha509]

Thank you @garg3133 !

[garg3133]

Somehow got the tests working locally and without the change made in this PR, the added test failed with the below error (as expected):

So, the added test is working correctly.

cc: @AutomatedTester