Mock Route53 change_resource_record_sets in Python

This code demonstrates how to mock AWS Route53 change_resource_record_sets API calls using the botocore Stubber, allowing you to test DNS update logic without touching real infrastructure.

Medium Python 3.9+ Aug 9, 2026 Cloud + Python 14 views 0 copies

aws route53 boto3 mock stubber

Requires third-party packages — install first

pip install boto3

Python code

59 lines

Python 3.9+

import boto3
from botocore.exceptions import ClientError

def mock_change_resource_record_sets():
    """Demonstrates Route53 change_resource_record_sets with a mock client."""
    # Create a mock Route53 client
    route53 = boto3.client('route53', region_name='us-east-1', 
                          aws_access_key_id='fake', aws_secret_access_key='fake')
    
    # Mock the change_resource_record_sets response
    mock_response = {
        'ChangeInfo': {
            'Id': '/change/C1234567890123',
            'Status': 'PENDING',
            'SubmittedAt': '2024-01-15T10:00:00Z',
            'Comment': 'Mock change for demonstration'
        }
    }
    
    # Use botocore stubber to simulate AWS response
    from botocore.stub import Stubber
    stubber = Stubber(route53)
    
    change_batch = {
        'Changes': [
            {
                'Action': 'UPSERT',
                'ResourceRecordSet': {
                    'Name': 'example.com.',
                    'Type': 'A',
                    'TTL': 300,
                    'ResourceRecords': [{'Value': '192.0.2.1'}]
                }
            }
        ]
    }
    
    expected_params = {
        'HostedZoneId': 'Z1234567890',
        'ChangeBatch': change_batch
    }
    
    stubber.add_response('change_resource_record_sets', mock_response, expected_params)
    stubber.activate()
    
    try:
        response = route53.change_resource_record_sets(
            HostedZoneId='Z1234567890',
            ChangeBatch=change_batch
        )
        return response['ChangeInfo']
    except ClientError as e:
        return {'Error': str(e)}
    finally:
        stubber.deactivate()

if __name__ == "__main__":
    result = mock_change_resource_record_sets()
    print(result)

Output

stdout

{'Id': '/change/C1234567890123', 'Status': 'PENDING', 'SubmittedAt': '2024-01-15T10:00:00Z', 'Comment': 'Mock change for demonstration'}

How it works

The code uses boto3.client to create a Route53 client, then wraps it with a Stubber from botocore. The stubber intercepts the change_resource_record_sets call and returns a pre-defined mock response when the exact expected parameters match. This lets you test your AWS integration logic without hitting the real AWS API. The expected parameters are specified in expected_params and must exactly match what the client sends. The stubber is activated before the call and deactivated in a finally block to ensure cleanup. By mocking the client this way, you can validate your code's logic, error handling, and response parsing reliably in a local development or CI environment.

Common mistakes

Forgetting to activate the stubber before making the API call
Not matching the expected parameters exactly, causing a mismatch error
Leaving the stubber active after the test, which can interfere with other calls
Assuming the real AWS client is needed instead of a mock for unit tests

Variations

Use `moto` to mock the entire Route53 service for more complex scenarios
Use the `unittest.mock` patch to replace the client method directly

Real-world use cases

Unit testing a script that updates DNS records during deployment to ensure it doesn't break the real zone.
Validating CI/CD pipeline code that modifies Route53 records before applying it to production.
Simulating Route53 API responses in a development environment to debug your integration without incurring AWS costs.

Mock Route53 change_resource_record_sets in Python

Python code

Output

How it works

Common mistakes

Variations

Real-world use cases

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