'Verify correct access token request body construction.'

def test_prepare_token_request(self):

    self.assertFormBodyEqual(prepare_token_request(**self.grant_body), self.auth_grant_body)
    self.assertFormBodyEqual(prepare_token_request(**self.pwd_body), self.password_body)
    self.assertFormBodyEqual(prepare_token_request(**self.cred_grant), self.cred_body)
