# REL08-BP03 Integrate resiliency testing as part of your deployment
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 Resiliency tests (using the [principles of chaos engineering](https://principlesofchaos.org/)) are run as part of the automated deployment pipeline in a pre-production environment. 

 These tests are staged and run in the pipeline in a pre-production environment. They should also be run in production as part of [https://docs.aws.amazon.com/wellarchitected/latest/reliability-pillar/test-reliability.html#GameDays](https://docs.aws.amazon.com/wellarchitected/latest/reliability-pillar/test-reliability.html#GameDays). 

 **Level of risk exposed if this best practice is not established:** Medium 

## Implementation guidance
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+  Integrate resiliency testing as part of your deployment. Use Chaos Engineering, the discipline of experimenting on a workload to build confidence in the workload’s capability to withstand turbulent conditions in production. 
  +  Resiliency tests inject faults or resource degradation to assess that your workload responds with its designed resilience. 
    +  [Well-Architected lab: Level 300: Testing for Resiliency of EC2 RDS and S3](https://wellarchitectedlabs.com/Reliability/300_Testing_for_Resiliency_of_EC2_RDS_and_S3/README.html) 
  +  These tests can be run regularly in pre-production environments in automated deployment pipelines. 
  +  They should also be run in production, as part of scheduled game days. 
  +  Using Chaos Engineering principles, propose hypotheses about how your workload will perform under various impairments, then test your hypotheses using resiliency testing. 
    +  [Principles of Chaos Engineering](https://principlesofchaos.org/) 

## Resources
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 **Related documents:** 
+  [Principles of Chaos Engineering](https://principlesofchaos.org/) 
+  [What is AWS Fault Injection Simulator?](https://docs.aws.amazon.com/fis/latest/userguide/what-is.html) 

 **Related examples:** 
+  [Well-Architected lab: Level 300: Testing for Resiliency of EC2 RDS and S3](https://wellarchitectedlabs.com/Reliability/300_Testing_for_Resiliency_of_EC2_RDS_and_S3/README.html)