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Web Tests failing with the latest insiders of VS Code #16645

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@DonJayamanne

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@DonJayamanne

Logs here https://github.com/microsoft/vscode-jupyter/actions/runs/15063137656/job/42342002908

(72%)Downloading VS Code Insiders: 15664157/20275505 (77%)Downloading VS Code Insiders: 18431031/20275505 (91%)Downloading VS Code Insiders: complete
Extracted to /home/runner/work/vscode-jupyter/vscode-jupyter/.vscode-test-web/vscode-web-insider-65fd0a7764119263ab3d566[91](https://github.com/microsoft/vscode-jupyter/actions/runs/14937221921/job/41967375873?pr=16625#step:44:92)53ee900ef1844ed
Serving dev extensions from /home/runner/work/vscode-jupyter/vscode-jupyter
Serving local content /home/runner/work/vscode-jupyter/vscode-jupyter/src/test/datascience at /static/mount
Listening on http://localhost:3000
Opening browser on http://localhost:3000...
GET /static/build/out/vs/webPackagePaths.js 404 6.7[92](https://github.com/microsoft/vscode-jupyter/actions/runs/14937221921/job/41967375873?pr=16625#step:44:93) ms - 9
GET /static/build/out/vs/workbench/workbench.web.main.nls.js 404 7.008 ms - 9
Failed to load resource: the server responded with a status of 404 (Not Found)
Failed to load resource: the server responded with a status of 404 (Not Found)
%c WARN color: #9[93](https://github.com/microsoft/vscode-jupyter/actions/runs/14937221921/job/41967375873?pr=16625#step:44:94) Ignoring the error while validating workspace folder vscode-test-web://mount/ - ENOPRO: No file system provider found for resource 'vscode-test-web://mount/'
Ignoring the error while validating workspace folder vscode-test-web://mount/ - ENOPRO: No file system provider found for resource 'vscode-test-web://mount/'
%c WARN color: #993 Via 'product.json#extensionEnabledApiProposals' extension 'ms-python.vscode-pylance' wants API proposal 'mcpConfigurationProvider' but that proposal DOES NOT EXIST. Likely, the proposal has been finalized (check 'vscode.d.ts') or was abandoned.
Via 'product.json#extensionEnabledApiProposals' extension 'ms-python.vscode-pylance' wants API proposal 'mcpConfigurationProvider' but that proposal DOES NOT EXIST. Likely, the proposal has been finalized (check 'vscode.d.ts') or was abandoned.
%c INFO color: #33f Found additional builtin location extensions in env [http://localhost:3000/static/extensions/fs]
Found additional builtin location extensions in env [ 'http://localhost:3000/static/extensions/fs' ]
%c INFO color: #33f Updating additional builtin extensions cache
Updating additional builtin extensions cache
%c INFO color: #33f Loading development extension at /static/devextensions
Loading development extension at /static/devextensions
Overwriting extension <<copilot-instructions.md>> to now point to mime <<text/x-instructions>>
%c INFO color: #33f ChatSessionStore: Migrating 0 chat sessions from storage service to file system
ChatSessionStore: Migrating 0 chat sessions from storage service to file system
%c INFO color: #33f vscode-test-web-support fs provider registers for vscode-test-web, initial content from http://localhost:3000/static/mount
vscode-test-web-support fs provider registers for vscode-test-web, initial content from http://localhost:3000/static/mount
GET /static/devextensions/out/extension.web.bundle 404 1.593 ms - 9
%c  ERR color: #f33 Error: Not Found
	at Tj.yb (http://localhost:3000/static/build/out/vs/workbench/api/worker/extensionHostWorkerMain.js:157:1162)
	at async Tj.sb (http://localhost:3000/static/build/out/vs/workbench/api/worker/extensionHostWorkerMain.js:121:17409)
	at async Tj.$extensionTestsExecute (http://localhost:3000/static/build/out/vs/workbench/api/worker/extensionHostWorkerMain.js:121:17158)
Error: Not Found
	at Tj.yb (http://localhost:3000/static/build/out/vs/workbench/api/worker/extensionHostWorkerMain.js:157:[116](https://github.com/microsoft/vscode-jupyter/actions/runs/14937221921/job/41967375873?pr=16625#step:44:117)2)
	at async Tj.sb (http://localhost:3000/static/build/out/vs/workbench/api/worker/extensionHostWorkerMain.js:121:17409)
	at async Tj.$extensionTestsExecute (http://localhost:3000/static/build/out/vs/workbench/api/worker/extensionHostWorkerMain.js:121:17158)
Error: Not Found
Failed to run tests Error: Test failed
    at /home/runner/work/vscode-jupyter/vscode-jupyter/node_modules/@vscode/test-web/out/server/index.js:60:23
    at async BindingCall.call (/home/runner/work/vscode-jupyter/vscode-jupyter/node_modules/playwright-core/lib/client/page.js:690:18)
    at async Page._onBinding (/home/runner/work/vscode-jupyter/vscode-jupyter/node_modules/playwright-core/lib/client/page.js:163:7)

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