def get_index_from_s3(key):
    try:
        response = s3.get_object(
            Bucket=bucket,
            Key=key
        )
        body = response.get('Body')
        content = body.read().decode('utf-8')
    except ClientError as ex:
        # print 'EXCEPTION MESSAGE: {}'.format(ex.response['Error']['Code'])
        content = '{}'

    message = json.loads(content)
    return message

def arrange(self):
    super(WhenCognitoAndNerfFoundTestCase, self).arrange()
    # self.s3_response = self.s3.get_object.return_value
    self.s3_body = self.s3.get_object.return_value.get.return_value
    self.s3_body.read.return_value.decode.side_effect = [
        self.cognito_content,
        self.nerf_content]
    signed_url = "https://this.is/a/signed/url/index.html"
    self.s3.generate_presigned_url.return_value = signed_url

def arrange(self):
    super(WhenCognitoOnlyFoundTestCase, self).arrange()
    # self.s3_response = MagicMock()
    # botocore.response.StreamingBody
    self.s3.get_object.side_effect = [{},
                                      ClientError]
    # self.s3_response = self.s3.get_object.return_value
    self.s3_body = self.s3.get_object.return_value.get.return_value
    self.s3_body.read.return_value.decode.return_value =
        self.cognito_content

def get_index_from_s3(key):
        try:
            response  = s3.get_object(
                Bucket=bucket,
                Key=key
            )
            body = response.get('Body')
>           content = body.read().decode('utf-8')
E            AttributeError: 'NoneType' object has no attribute 'read'

master_profile.py:66: AttributeError