The update_function_configuration currently returns an empty dict no matter what but certain lambda libraries (ie, Zappa) require a realistic return value... which is simply the current config after being updated.

https://github.com/localstack/localstack/blob/9cba1010dfcbf2b7672df4d7da46b7e8ab287f64/localstack/services/awslambda/lambda_api.py#L872

https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/lambda.html#Lambda.Client.update_function_configuration

There might also be some other magic enriching that result but my quick read-through looks like it's an empty dict.



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def test_dotnet_lambda_running_in_docker(self):
        if not use_docker():
            return
        testutil.create_lambda_function(
            func_name=TEST_LAMBDA_NAME_DOTNETCORE2,
            zip_file=self.zip_file_content,
            handler='DotNetCore2::DotNetCore2.Lambda.Function::SimpleFunctionHandler',
            runtime=LAMBDA_RUNTIME_DOTNETCORE2
        )
        result = self.lambda_client.invoke(
            FunctionName=TEST_LAMBDA_NAME_DOTNETCORE2, Payload=b'{}')
        result_data = result['Payload'].read()
        self.assertEqual(result['StatusCode'], 200)
        self.assertEqual(to_str(result_data).strip(), '{}')
        
        expected = ['Running .NET Core 2.0 Lambda']
        self.check_lambda_logs(TEST_LAMBDA_NAME_DOTNETCORE2, expected_lines=expected)
        
        testutil.delete_lambda_function(TEST_LAMBDA_NAME_DOTNETCORE2)
class TestRubyRuntimes(LambdaTestBase):
    @classmethod
    def setUpClass(cls):
        cls.lambda_client = aws_stack.connect_to_service('lambda')
    def test_ruby_lambda_running_in_docker(self):
        if not use_docker():
            return
        zip_file = testutil.create_zip_file(
            TEST_LAMBDA_RUBY, get_content=True)
        testutil.create_lambda_function(
            func_name=TEST_LAMBDA_NAME_RUBY,