add unit test to check for issue #1661
add unit test to check for issue #1661

raintank/raintank-metric,replay/metrictank,replay/metrictank,raintank/raintank-metric,raintank/metrictank,raintank/metrictank,replay/metrictank,replay/metrictank,raintank/metrictank,raintank/raintank-metric,raintank/metrictank