These are the straightforward ones.
Note that there is a line in zerver.lib.test_classes.build_webhook_url
that lost test coverage. That's because most of our tests test using
stream messages so the webhook URLs being tested always have a query
parameter. So the line that accounts for there being no query
parameters never gets called, which is fine, but we should still
keep it.
This is just a basic Dropbox webhook integration. It just
notifies a user when something has changed, it does not
specify what changed. Doing so would require storing data,
as Dropbox API was created mainly for file managers, not
integrations like this.
Closes#5672
Aditya Bansal
Eeshan Garg
Angelika Serwa