As part of your deployment pipeline, you want to enable automated testing of your AWS CloudFormation template. What testing should be performed to enable faster feedback while minimizing costs and risk? Select three answers from the options given below

Answer options:

A.Use the AWS CloudFormation Validate Template to validate the syntax of the template
B.Use the AWS CloudFormation Validate Template to validate the properties of resources defined in the template.
C.Validate the template’s is syntax using a general JSON parser.
D.Validate the AWS CloudFormation template against the official XSD scheme definition published by Amazon Web Services.
E.In the testing environment create and update the stack with the template. If the template fails rollback will return the stack and its resources to exactly the same state.
F.In the testing environment, while creating the stack, specify an Amazon SNS topic for subscription. Your testing environment runs tests when it receives notification when the stack is created or updated.

Answer – A,E and F
The AWS documentation mentions the following
The aws cloudformation validate-template command is designed to check only the syntax of your template. It does not ensure that the property values that you have specified for a resource are valid for that resource. Nor does it determine the number of resources that will exist when the stack is created.
To check the operational validity, you need to attempt to create the stack. There is no sandbox or test area for AWS CloudFormation stacks, so you are charged for the resources you create during testing.
Option F is needed for notification.
For more information on Cloudformation template validation, please visit the link:
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-validate-template.html