These were a bit hard to navigate before, it was difficult to determine
where to look if you wanted to write a test for new functionality. Now
everything devoted to making "make check" work is in Makefile-test.am.
The file is delineated into sections and comments are added.

All the rules for converting some of the tests into installed tests, and
installing them in the right place, are in Makefile-insttest.am now.

https://bugzilla.gnome.org/show_bug.cgi?id=775205