fix(iam): fix a broken test (#4790)
fix(iam): fix a broken test (#4790)

fixes #4770

I think it's sufficient to check if there's a newline.

GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples