[Bug] ImdsManagedIdentitySource.s_cachedBaseEndpoint was never cleared by ApplicationBase.ResetStateForTest()

[gladjohn]

Library version used

latest

.NET version

net 8

Scenario

ManagedIdentityClient - managed identity

Is this a new or an existing app?

This is a new app or experiment

Issue description and reproduction steps

ImdsManagedIdentitySource.s_cachedBaseEndpoint was never cleared by ApplicationBase.ResetStateForTest(), causing tests that modify AZURE_POD_IDENTITY_AUTHORITY_HOST to bleed their cached endpoint into subsequent tests.

Relevant code snippets

Expected behavior

No response

Identity provider

Microsoft Entra ID (Work and School accounts and Personal Microsoft accounts)

Regression

4.76.0

Solution and workarounds

add to reset cache