tests: spell out hg commands for readability These are the abbreviations that are used just in a couple of places in the tests. `hg d` is in my opinion an abbreviation of core command that everyone should know, but I'd rather not use "unofficial" abbreviations in tests because it takes a second to mentally expand what the command is when you're reading it. In CLI when you type commands, it makes sense to abbreviate things to type less. But tests are read much more often than they are written, so I'd like to apply the same guidelines to them as to regular code: readability first. Apart from readability, it's also consistency, because these particular abbreviations are rare, and everywhere else the commands are spelled out.