The URL specified in the input field of the base URL in the Selenium IDE and the URL specified in the target parameter of the open command are not just combined. Opening /test/ will only be considered an absolute URL for your domain.
However, you can specify the target ./test/ , which, as I said, asks for http://test.info:50/test/test/ . I find this very useful, as in some environments my web application will be in the root and in some other environments in the base path, for example / myapp /.
Regarding the empty base URL, I assume that it worked because the browser page on which the test was running already showed the page from the correct domain. If you run the open command on a page on any other site, the open command would request the / test / page from that site. After that, this base URL would point to this site.
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