When you create a Lambda permission you send the __statement id__ as mandatory parameter.

https://docs.aws.amazon.com/lambda/latest/dg/API_AddPermission.html#API_AddPermission_RequestSyntax

However this id is generated by a random value. 

https://github.com/localstack/localstack/blob/b3917bf248b77ced8ef80a3d5c0561960066db5d/localstack/services/awslambda/lambda_api.py#L927

Due to this problem, the tools like Terraform or Ansible fail when it has to be retrieved to check the existence of this element.

If you agree I could make a PR with the fix and its test.
zip_file = testutil.create_lambda_archive(
            load_file(TEST_LAMBDA_PYTHON), get_content=True,
            libs=TEST_LAMBDA_LIBS, runtime=LAMBDA_RUNTIME_PYTHON36,
            file_name='abc/def/main.py')
        testutil.create_lambda_function(func_name=func_name, zip_file=zip_file,
            handler='abc.def.main.handler', runtime=LAMBDA_RUNTIME_PYTHON36)
        
        result = self.lambda_client.invoke(FunctionName=func_name, Payload=b'{}')
        result_data = json.loads(result['Payload'].read())
        self.assertEqual(result['StatusCode'], 200)
        self.assertEqual(result_data['event'], json.loads('{}'))
class TestNodeJSRuntimes(LambdaTestBase):
    @classmethod
    def setUpClass(cls):
        cls.lambda_client = aws_stack.connect_to_service('lambda')
    def test_nodejs_lambda_running_in_docker(self):
        if not use_docker():
            return
        zip_file = testutil.create_zip_file(
            TEST_LAMBDA_NODEJS, get_content=True)
        testutil.create_lambda_function(
            func_name=TEST_LAMBDA_NAME_JS,
            zip_file=zip_file,
            handler='lambda_integration.handler',
            runtime=LAMBDA_RUNTIME_NODEJS810
        )
        result = self.lambda_client.invoke(
            FunctionName=TEST_LAMBDA_NAME_JS, Payload=b'{}')
        result_data = result['Payload'].read()
        self.assertEqual(result['StatusCode'], 200)