AWS Lambda function is not updating in basic test environment

Question

I'm trying to set up a very basic AWS Lambda script, but I struggle to get the AWS Lambda Test functionality to recognize the changes I make.

To setup the simplest possible test, I created a new AWS Lambda function for Python 3.7. I then make a simple change in the code as below, add a test output and run Test:

import json

def lambda_handler(event, context):
    # TODO implement
    return {
        'statusCode': 200,
        'body': json.dumps('I changed this text')
    }

I've verified that Version: is set to $LATEST - yet when I run the test, there is no change in my output - it keeps returning the original code output. Further, if I try to export the function, I get the original code - not my updated code above (despite having saved it).

I realize this seems very basic, but I wanted to check if others have experienced this as well.

I did click Save - I tried doing so both via File/Save, Ctrl + S. If I hit Deploy and then Test I get the updated result - but I would expect that it would be possible to test changes without deploying — mfcss
– mfcss, Commented Nov 3, 2020 at 20:10
I'm not sure what's the official expected behavior, but in my case I gotta hit deploy. — xialin
– xialin, Commented Nov 3, 2020 at 22:59

Aaron C · Accepted Answer · 2023-10-18 04:16:39Z

49

Based on feedback, it seems hitting Deploy is required in order to be able to test the updated function

additional: Deploy updates the code the test runs against.

However, if you want to test different inputs to the same code then you can create a test and invoke it without deploying. See the hello world template for how to pass the input.

edited Oct 18, 2023 at 4:16

Aaron C

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answered Nov 4, 2020 at 7:04

mfcss

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Comments

ouflak · Accepted Answer · 2021-10-22 13:05:44Z

10

Even with hitting deploy, there's a definite delay. Try adding a print statement and hitting deploy and then testing. This will show that it often doesn't accept the new code right away. EXTREMELY frustrating for debugging. I have to literally refresh my lambda console page to get the changes to take.

edited Oct 22, 2021 at 13:05

ouflak

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answered Oct 22, 2021 at 12:58

Strider

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