How to mock CodeBuild with Step Functions Local

Question

Hi, 
Does Step Functions Local support CodeBuild? I have a step in my state machine which starts as follows:

"StartBuild": {
            "Type": "Task",
            "Resource": "arn:aws:states:::codebuild:startBuild.sync",
            "Parameters": {
              "ProjectName": "${project_name}",
              etc.

I'm mocking the response from this step to have StatusCode 200 in my MockConfigFile.json. When I run this in Step Functions Local, my Docker container gives this error: The provided ARN 'arn:aws:states:us-east-1:123456789012:codebuild:startBuild.sync' is invalid.

Is there any advice on how to mock this step?

Answer

The issue might stem from an incomplete definition in your mock configuration file. If you haven't specified mocked service integration responses in the file, Step Functions Local will attempt to invoke the actual AWS service integration using the ARN provided in your state machine definition.

For instance, if your state machine includes a task with the resource ARN for an AWS CodeBuild project (`arn:aws:states:::codebuild:startBuild.sync`), and there's no mocked response for this task in the configuration file, Step Functions Local will try to start an actual build using the CodeBuild service. This explains the error message you're encountering: `The provided ARN 'arn:aws:states:us-east-1:123456789012:codebuild:startBuild.sync' is invalid.` because the mocked service integration responses were not found.

Try to check the Key sources to properly construct your mock configuration file.

Key sources:
- [Using Mocked Service Integrations](https://docs.aws.amazon.com/step-functions/latest/dg/sfn-local-test-sm-exec.html)
- [Configuration File for Mocked Service Integrations](https://docs.aws.amazon.com/step-functions/latest/dg/sfn-local-mock-cfg-file.html)

How to mock CodeBuild with Step Functions Local

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