def test_smtpapiheader_setUniqueArgs(self):
"""Test SendGrid SMTP Header unique args"""
expected = 'X-SMTPAPI: {"unique_args": {"testa": 1, "testb": 2}}'
h = SmtpApiHeader()
h.set_unique_args({'testa': 1, 'testb': 2})
self.assertEqual(h.__str__(), expected)
