How do you mock an aws service that's not mocked by moto?

Question

I'm using moto to mock out aws services to write my test cases and supported use cases is fine:

@mock_sts
def test_check_aws_profile(self):
    session = boto3.Session(profile_name='foo')
    client = session.client('sts')
    client.get_caller_identity().get('Account')

But there are a few services like es that isn't supported at all. How do I begin to mock this?

I've tried this alternative mocking approach for testing but not sure if there's a better approach

def test_with_some_domains(self, mocker):
    mocked_boto = mocker.patch('mymodule.boto3')
    mocked_session = mocked_boto.Session()
    mocked_client.list_domain_names.return_value = ['foo-bar-baz']
    mymodule.function_call()

mymodule.py 

def function_call():
    session = boto3.Session(profile_name=my_profile)
    client = session.client('es', some_region)
    domain_names = client.list_domain_names()

Answer 1

The ElasticSearch has now been implemented as of Moto 2.2.20

Other unimplemented services/features can be mocked like so:

import boto3
import botocore
from unittest.mock import patch

orig = botocore.client.BaseClient._make_api_call

def mock_make_api_call(self, operation_name, kwarg):
    if operation_name == 'UnsupportedOperation':
        # Make whatever changes you expect to happen during this operation
        return {
            "expected": "response",
            "for this": "operation"
        }
    # If we don't want to patch the API call, call the original API
    return orig(self, operation_name, kwarg)


# add supported services as appropriate 
@mock_s3
def test_unsupported_feature()

    with patch('botocore.client.BaseClient._make_api_call', new=mock_make_api_call):
        function_under_test()

This allows you to completely customize the boto3 behaviour, on a per-method basis.

Taken from the Moto documentation here: http://docs.getmoto.org/en/latest/docs/services/patching_other_services.html