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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Jerome Van Der Linden (@jeromevdl) Automate Local Testing of CDK-defined Step Functions Solutions Architect Builder @ AWS

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Who am I ? Jérôme Van Der Linden Solutions Architect Builder @ AWS (Geneva, Switzerland) Former consultant, developer, tech lead, agile & devops coach, architect @ OCTO Technology Husband and Dad of 3 jeromevdl

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Objec8ves • Unit testing AWS Step Functions State Machines • Defined with CDK code • Locally without reaching the cloud • Automate as much as possible the process

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Big Picture

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Big Picture

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark CDK-defined Step Functions State Machine

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark CDK-defined Step Functions State Machine

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark CDK-defined Step Functions State Machine

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark CDK Deploy

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark CDK Deploy Since I recorded this video, I discovered cdk-asl-extractor It permits to retrieve the ASL without deploying the stack. 😀🤩 Use cdk synth to get the CloudFormation template and use cdk-asl-extractor to get the ASL from the template.

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Outputs 🌀🌩☠ ❗💥🤯 output.json Stack name Output name Randomly generated string Construct name

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Extracting the State Machine definition Rocks!

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark State Machine definition state_machine.asl.json

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Wrap-up: CDK code to JSON ASL

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Mocked service integration MockConfigFile.json State Machine name Mocked states Mocked responses names Mocked responses definitions

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Step Func8ons Local Start stepfunctions-local: Mocked Configuration

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Step Functions Local Create the state machine locally: State machine definition (ASL / JSON) State Machine name (same as in the MockConfigFile.json)

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Wrap-up: Step-Func8ons local bootstrap

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Unit Tests State Machine name (same as in the MockConfigFile.json) Test case name (same as in the MockConfigFile.json) Local endpoint

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Unit Tests Test case name (same as in the MockConfigFile.json)

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Wrap-up

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Wrap-up 1. Retrieve the state machine ASL from the CDK code

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Wrap-up 1. Retrieve the state machine ASL from the CDK code 2. Create Mocked Service integration config

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Wrap-up 1. Retrieve the state machine ASL from the CDK code 2. Create Mocked Service integration config 3. Start Step Functions local with this mocked configuration 4. Create a State Machine locally

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Wrap-up 1. Retrieve the state machine ASL from the CDK code 2. Create Mocked Service integration config 3. Start Step Functions local with this mocked configuration 4. Create a State Machine locally 5. Run your tests (using the SDK)

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Wrap-up 1. Retrieve the state machine ASL from the CDK code 2. Create Mocked Service integration config 3. Start Step Functions local with this mocked configuration 4. Create a State Machine locally 5. Run your tests (using the SDK)

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Resources

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark • Testing Step Functions State Machines Locally • https://docs.aws.amazon.com/step-functions/latest/dg/sfn-local.html • Using Mocked Service Integrations • https://docs.aws.amazon.com/step-functions/latest/dg/sfn-local-test-sm-exec.html • Mocking service integrations with AWS Step Functions Local • https://aws.amazon.com/blogs/compute/mocking-service-integrations-with-aws-step-functions-local/ • Code Sample GitHub • https://github.com/aws-samples/step-functions-direct-integrations/tree/main/direct-integration/infra

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© 2022, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark © 2019, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Amazon Confidential and Trademark Thank you jeromevdl Jérôme Van Der Linden