def test_smtpapiheader_addTo(self):
"""Test SendGrid SMTP header with recipients"""
expected = 'X-SMTPAPI: {"to": ["*****@*****.**", ' + \
'"*****@*****.**", "*****@*****.**"]}'
tos = ['*****@*****.**',
'*****@*****.**',
'*****@*****.**']
h = SmtpApiHeader()
h.add_to(tos)
# remember we are testing a string against a string
self.assertEqual(h.__str__(), expected)
