Add browser test

[zhiyuanliang-ms]

No description provided.

[juniwang]

The are errors in the build logs https://github.com/Azure/AppConfiguration-JavaScriptProvider/actions/runs/17439118545/job/49517111057?pr=220. Are they expected?

Failed to load. Error message: Test Error. Retrying in 5000 ms.
Refresh failed: Error: All fallback clients failed to get configuration settings.
    at #executeWithFailoverPolicy (file:///home/runner/work/AppConfiguration-JavaScriptProvider/AppConfiguration-JavaScriptProvider/out/esm/src/appConfigurationImpl.js:701:15)
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    at async #getConfigurationSetting (file:///home/runner/work/AppConfiguration-JavaScriptProvider/AppConfiguration-JavaScriptProvider/out/esm/src/appConfigurationImpl.js:633:24)
    at async #refreshKeyValues (file:///home/runner/work/AppConfiguration-JavaScriptProvider/AppConfiguration-JavaScriptProvider/out/esm/src/appConfigurationImpl.js:544:30)
    at async Promise.allSettled (index 0)
    at async #refreshTasks (file:///home/runner/work/AppConfiguration-JavaScriptProvider/AppConfiguration-JavaScriptProvider/out/esm/src/appConfigurationImpl.js:370:25)
    at async AzureAppConfigurationImpl.refresh (file:///home/runner/work/AppConfiguration-JavaScriptProvider/AppConfiguration-JavaScriptProvider/out/esm/src/appConfigurationImpl.js:274:13)
    at async Context.<anonymous> (file:///home/runner/work/AppConfiguration-JavaScriptProvider/AppConfiguration-JavaScriptProvider/out/esm/test/requestTracing.test.js:177:13)
Failed to load. Error message: All fallback clients failed to get configuration settings.. Retrying in 5000 ms.
Failed to load. Error message: All fallback clients failed to get configuration settings.. Retrying in 5000 ms.

[zhiyuanliang-ms]

The are errors in the build logs https://github.com/Azure/AppConfiguration-JavaScriptProvider/actions/runs/17439118545/job/49517111057?pr=220. Are they expected?

Failed to load. Error message: Test Error. Retrying in 5000 ms.
Refresh failed: Error: All fallback clients failed to get configuration settings.
    at #executeWithFailoverPolicy (file:///home/runner/work/AppConfiguration-JavaScriptProvider/AppConfiguration-JavaScriptProvider/out/esm/src/appConfigurationImpl.js:701:15)
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    at async #getConfigurationSetting (file:///home/runner/work/AppConfiguration-JavaScriptProvider/AppConfiguration-JavaScriptProvider/out/esm/src/appConfigurationImpl.js:633:24)
    at async #refreshKeyValues (file:///home/runner/work/AppConfiguration-JavaScriptProvider/AppConfiguration-JavaScriptProvider/out/esm/src/appConfigurationImpl.js:544:30)
    at async Promise.allSettled (index 0)
    at async #refreshTasks (file:///home/runner/work/AppConfiguration-JavaScriptProvider/AppConfiguration-JavaScriptProvider/out/esm/src/appConfigurationImpl.js:370:25)
    at async AzureAppConfigurationImpl.refresh (file:///home/runner/work/AppConfiguration-JavaScriptProvider/AppConfiguration-JavaScriptProvider/out/esm/src/appConfigurationImpl.js:274:13)
    at async Context.<anonymous> (file:///home/runner/work/AppConfiguration-JavaScriptProvider/AppConfiguration-JavaScriptProvider/out/esm/test/requestTracing.test.js:177:13)
Failed to load. Error message: All fallback clients failed to get configuration settings.. Retrying in 5000 ms.
Failed to load. Error message: All fallback clients failed to get configuration settings.. Retrying in 5000 ms.

@juniwang Yes.

This testcase The initial load and refresh will both fail, but we only need to check whether request contains the header we want, this is achieved through a pipeline policy.