verify database connectivity once for all databases before running any of the tests

[hamiltont]

the toolset alreday does some DB setup before each test, like restarting or something. It should probably also verify database connectivity too, using something like nc -vz <db host> <db port>. This would be really helpful for cassandra and mongodb, who are not ready to start handling connections just because service <foo> restart has returned

See #1082

[marko-asplund]

Something like this could do the trick:

CASSANDRA_PORT=9160
for i in 1 2 3 4 5; do
nc -vz $TFB_DATABASE_HOST $CASSANDRA_PORT && echo 'C* ok' && break || echo 'waiting for C*'; sleep 2
if [ $i -eq '5' ]; then
echo 'ERROR: failed to connect to Cassandra'
fi
done

[marko-asplund]

@hamiltont please see my take on implementing this feature in PR #1357

[hamiltont]

Fixed in #1357, thanks @marko-asplund!