# 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.


bucket_name = 'test-bucket-%s' % short_uid()
        self.s3_client.create_bucket(Bucket=bucket_name)
        
        object_key = 'test-presigned-post-key'
        presigned_request = self.s3_client.generate_presigned_post(
            Bucket=bucket_name,
            Key=object_key,
            ExpiresIn=2
        )
        
        time.sleep(3)
        
        files = {'file': 'file content'}
        response = requests.post(presigned_request['url'], data=presigned_request['fields'], files=files, verify=False)
        self.assertEqual(response.status_code, 400)
        self.assertTrue('ExpiredToken' in response.text)
        
        self._delete_bucket(bucket_name)
    def test_s3_delete_response_content_length_zero(self):