validate has an exception and is before authenticate so authenticate …

…should not be triggered and could do with an empty mock

tests/unit/plugins/modules/test_vault_pki_generate_certificate.py

@@ -27,7 +27,7 @@
 def failed_authenticator():
     authenticator = HashiVaultAuthenticator
     authenticator.validate = mock.Mock(side_effect=HashiVaultValueError("Authentication failed"))
-    authenticator.authenticate = mock.Mock(wraps=lambda client: 'throwaway')
+    authenticator.authenticate = mock.Mock()
 
     return authenticator