Trailing slash in Redis URL causes invalid db number

[alexmic]

Description

When running tests on Heroku CI, the in-dyno Redis URL environment variable is set as redis://h:xxx@localhost:6379/. The trailing slash causes this error: ReplyError: ERR invalid DB index, I presume because the url parser does not check if the / split actually yields a valid database number

bull/lib/queue.js

Line 304 in 1898b5a

redisOpts.db = redisUrl.pathname ? redisUrl.pathname.split('/')[1] : 0;

Bull version

3.14.0

[stale]

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