# Type of request: This is a ...
[ ] bug report
[x] feature request

# Detailed description
As a Developer,
I want to be able to simulate BadDigest and InvalidDigest errors,
So that I can test the error handling logic

## Expected behavior
https://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html
BadDigest: The Content-MD5 you specified did not match what we received.
InvalidDigest: The Content-MD5 you specified is not valid.

## Actual behavior
localstack returns InvalidDigest when MD5 does not match payload.


context.request._cached_data = '{}'
        context.request.args = {'Qualifier': '$LATEST'}
        context.request.environ['HTTP_X_AMZ_INVOCATION_TYPE'] = 'RequestResponse'
        self._create_function(self.FUNCTION_NAME)
    @mock.patch('localstack.services.awslambda.lambda_api.run_lambda')
    def test_invoke_plain_text_response(self, mock_run_lambda):