pytest fixture to mock out the moto AWS Lambda capability such that it DOES NOT try to execute the code in a Docker container

pytest_fixture_mock_moto_lambda.py

import pytest
import moto

from mock import mock, patch
from moto import mock_lambda


@pytest.fixture(scope='function')
def aws_credentials():
    """Mocked AWS Credentials for moto."""
    os.environ['AWS_ACCESS_KEY_ID'] = 'testing'
    os.environ['AWS_SECRET_ACCESS_KEY'] = 'testing'
    os.environ['AWS_SECURITY_TOKEN'] = 'testing'
    os.environ['AWS_SESSION_TOKEN'] = 'testing'


@pytest.fixture(scope='function')
def lambda_mock(aws_credentials):
    with mock_lambda():
        yield boto3.client('lambda', region_name='us-east-1')


@pytest.fixture(scope='function')
def no_docker_lambda(lambda_mock):
    # Mock out the moto lambda code so that it __does not__ make a Docker container to run it 🤦
    p = patch.object(moto.awslambda.models.LambdaFunction, 'invoke', lambda *args, **kwargs: '{}')
    p.start()
    
    lambda_mock.create_function(FunctionName='some-function',
                                Runtime='python3.7',
                                Role='somerole',
                                Handler='lambda_handler',
                                Code={'ZipFile': b'muh lamduh'})
    
    yield
    
    p.stop()


def test_lambda(lambda_mock, no_docker_lambda):
   lambda_mock.invoke(FunctionName='some-function', InvocationType='Event', Payload='{}')