[Identity] Add broker credential to "dev" env group (#42599)

Signed-off-by: Paul Van Eck <[email protected]>

Author: pvaneck

sdk/identity/azure-identity/CHANGELOG.md

@@ -17,6 +17,7 @@
 ### Bugs Fixed
 
 - Fixed an issue where CAE (Continuous Access Evaluation) caches were not properly used by `AuthorizationCodeCredential` and the asynchronous `OnBehalfOfCredential`. ([#42145](https://github.com/Azure/azure-sdk-for-python/pull/42145))
+- Fixed an issue where brokered authentication was not included in the `DefaultAzureCredential` chain when `AZURE_TOKEN_CREDENTIALS` was set to `dev`. ([#42599](https://github.com/Azure/azure-sdk-for-python/pull/42599))
 
 ### Other Changes
 

sdk/identity/azure-identity/azure/identity/_internal/utils.py

@@ -161,7 +161,7 @@ def process_credential_exclusions(credential_config: dict, exclude_flags: dict,
 
     if token_credentials_env == "dev":
         # In dev mode, use only developer credentials
-        dev_credentials = {"visual_studio_code", "cli", "developer_cli", "powershell", "shared_token_cache"}
+        dev_credentials = {"visual_studio_code", "cli", "developer_cli", "powershell", "shared_token_cache", "broker"}
         for cred_key in credential_config:
             exclude_flags[cred_key] = cred_key not in dev_credentials
     elif token_credentials_env == "prod":

sdk/identity/azure-identity/tests/test_token_credentials_env.py

@@ -17,6 +17,7 @@
     SharedTokenCacheCredential,
     WorkloadIdentityCredential,
 )
+from azure.identity._credentials.broker import BrokerCredential
 from azure.identity._constants import EnvironmentVariables
 
 
@@ -39,6 +40,7 @@ def test_token_credentials_env_dev():
         assert AzureCliCredential in actual_classes
         assert AzureDeveloperCliCredential in actual_classes
         assert AzurePowerShellCredential in actual_classes
+        assert BrokerCredential in actual_classes
 
         # Assert no duplicates
         assert len(actual_classes) == len(set(actual_classes))