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Mock CDK Synth Output in Python for Template Testing

Simulate AWS CDK synth output with MagicMock to test or preview CloudFormation templates without running a real CDK app.

aws cdk cloudformation

Python

import json
from unittest.mock import MagicMock

def mock_cdk_synth() -> dict:
    """Simulate AWS CDK synth output for a simple S3 bucket."""
    cdk_app = MagicMock()
    cdk_app.synth.return_value.template = {
        "Resources": {
            "MyBucket": {
                "Type": "AWS::S3::Bucket",
              …

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