correct usage of location context?

[Szymon Polom]

I'm trying to shift my nginx instance from a multi-subdomain-setting to 
a one-domain-setting. I have the following config in the same server 
context:

location /redmine/ {
  root /var/www/redmine/public;
  passenger_enabled on;
}

location /test/ {
  root /var/www/test;
  autoindex on;
}

location / {
  root /var/www/main;
  autoindex on;
}

When I try to access http://example.com/test/testfile, nginx tries to 
read the file at /var/www/test/test/testfile instead of at 
/var/www/test/testfile. I guess my configuration is not correct; how can 
I force nginx to e.g.

serve everything beginning with /redmine/
from /var/www/redmine/public

?

Any help would be appreciated.