Question

A developer is building a serverless application with AWS SAM. A Lambda function is triggered by an S3 object-created event and must be tested locally before deploying to any AWS environment. The developer wants to invoke the function on their laptop using a realistic S3 event payload without deploying anything to the cloud. Which approach accomplishes this with the least effort?

Accepted Answer

Run 'sam local generate-event s3 put' to produce a sample S3 event and pipe it into 'sam local invoke' with the '-e' flag.

Answer

Deploy the stack with 'sam deploy', upload a test object to the S3 bucket, and inspect CloudWatch Logs to verify behavior.

Answer

Create a CodeBuild project with a buildspec that installs the AWS CLI and invokes the deployed Lambda function using 'aws lambda invoke'.

Answer

Use 'sam local start-api' to expose the function over HTTP and send a crafted JSON body using curl to simulate the S3 trigger.