add a test to check long sequences (#631)
add a test to check long sequences (#631)

the test fails, as intended,
since #631 is not merged yet in this branch.

unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso