It is my understanding that setting an environment varialbe `TEST_AWS_ACCOUNT_ID` for localstack sets that as the AWS account for the user in localstack.

However, setting it does not actually change any ARNs. For example:

1. Start localstack using `TEST_AWS_ACCOUNT_ID="111111111111" DEBUG=1 localstack start`
2. Deploy anything with an ARN (in this example I deployed a lambda)
3. Check the ARN. Example output for lambda:
```json
$ awslocal lambda list-functions
{
    "Functions": [
        {
            "FunctionName": "localtest-local-hello",
            "FunctionArn": "arn:aws:lambda:us-east-1:000000000000:function:localtest-local-hello",
            "Runtime": "nodejs10.x",
            "Role": "test_role",
            "Handler": "handler.hello",
            "CodeSize": 3077,
            "Description": "",
            "Timeout": 6,
            "MemorySize": 1024,
            "LastModified": "2019-11-06T06:43:53.451+0000",
            "CodeSha256": "V77gR13o90ET7+XquXBBc3Rxr1qDu1bE7S+A0Wbx5ys=",
            "Version": "$LATEST",
            "TracingConfig": {
                "Mode": "PassThrough"
            },
            "RevisionId": "3d4ed679-c1a9-4b7e-ad9e-f27e8543c5e9"
        }
    ]
}
```

ARN is still 000000000000
result = deploy_resource_via_sdk_function(resource_id, resources, resource_type, func, stack_name)
            results.append(result)
    return (results or [None])[0]
def deploy_resource_via_sdk_function(resource_id, resources, resource_type, func_details, stack_name):
    resource = resources[resource_id]
    client = get_client(resource, func_details)
    function = getattr(client, func_details['function'])
    params = func_details.get('parameters') or lambda_get_params()
    defaults = func_details.get('defaults', {})
    if 'Properties' not in resource:
        resource['Properties'] = {}
    resource_props = resource['Properties']
    if callable(params):
        params = params(resource_props, stack_name=stack_name, resources=resources)
    else:
        params = dict(params)
        for param_key, prop_keys in dict(params).items():
            params.pop(param_key, None)
            if not isinstance(prop_keys, list):
                prop_keys = [prop_keys]
            for prop_key in prop_keys:
                if prop_key == PLACEHOLDER_RESOURCE_NAME:
                    params[param_key] = resource_id
                    resource_name = get_resource_name(resource)
                    if resource_name:
                        params[param_key] = resource_name
                    else:
                        
                        try:
                            return resolve_ref(stack_name, resource_id, resources,