Quotes are your friend. Try

sage: cd "test-123"

It would be virtually impossible to adapt the preparser in a reasonable way 
to recognize this exceptional pattern. We'd basically have to teach it 
these specific prefixes. If we ever look at hooking preparsing somewhere 
else, then this might be an example to take into account (IPyhton must 
somehow recognize this and not subject it to python parsing, meaning we 
should hook in after that distinction has been made)

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