def test_credentials_basic():
c = Credentials('id', 'secret', 'us-west-2', 'sqs')
assert c._scope == CredentialScope('us-west-2', 'sqs')
dt = DateTime(2015, 8, 30, 12, 15)
assert c.scope(dt) == DatedCredentialScope('us-west-2', 'sqs', dt)
assert (
c.signing_key(dt).sign('')
== SigningKey('secret', c.scope(dt)).sign('')
)
