Update tests/test_utils_sendmail.py

tests/test_utils_sendmail.py

@@ -1,6 +1,5 @@
 import os
-import subprocess
-import getpass
+import tempfile
 from email.mime.text import MIMEText
 import sys
 sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))