Fix Azure credential test

tests/external/api/test_credentials.py

@@ -5,15 +5,15 @@
 )
 
 from data_safe_haven.directories import config_dir
-from data_safe_haven.exceptions import DataSafeHavenAzureError
+from data_safe_haven.exceptions import DataSafeHavenAzureError, DataSafeHavenCachedCredentialError
 from data_safe_haven.external.api.credentials import (
     AzureSdkCredential,
     DeferredCredential,
     GraphApiCredential,
 )
 
 
-class TestDeferredCredential:
+class TestAzureSdkCredential:
     def test_confirm_credentials_interactive(
         self,
         mock_confirm_yes,  # noqa: ARG002
@@ -37,8 +37,8 @@ def test_confirm_credentials_interactive_fail(
         DeferredCredential.cache_ = set()
         credential = AzureSdkCredential(skip_confirmation=False)
         with pytest.raises(
-            DataSafeHavenAzureError,
-            match="Error getting account information from Azure CLI.",
+            DataSafeHavenCachedCredentialError,
+            match="Selected credentials are incorrect.",
         ):
             credential.get_credential()
 
@@ -67,8 +67,6 @@ def test_decode_token_error(
         ):
             credential.decode_token(credential.token)
 
-
-class TestAzureSdkCredential:
     def test_get_credential(self, mock_azureclicredential_get_token):  # noqa: ARG002
         credential = AzureSdkCredential(skip_confirmation=True)
         assert isinstance(credential.get_credential(), AzureCliCredential)