# 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.


""" A context manager that captures stdout/stderr of the current thread. Use it as follows:
        with CaptureOutput() as c:
            ...
        print(c.stdout(), c.stderr())
    """
    orig_stdout = sys.stdout
    orig_stderr = sys.stderr
    orig___stdout = sys.__stdout__
    orig___stderr = sys.__stderr__
    CONTEXTS_BY_THREAD = {}
    class LogStreamIO(io.StringIO):
        def write(self, s):
            if isinstance(s, str) and hasattr(s, 'decode'):
                s = s.decode('unicode-escape')
            return super(CaptureOutput.LogStreamIO, self).write(s)
    def __init__(self):