It often takes a bit more than 30s to run on my local machine.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Meson has the ability to classify tests according to "suites", a list of
tags. This is especially useful when we want to run specific sets of
tests — e.g. only GLib's tests — instead of the whole test suite. It
also allows us to classify special tests, like "slow" ones, so that we
can only run them when needed.

These two still fail occasionally due to timeouts, so increase it a bit.

TESTS_ENVIRONMENT is reserved for the user to be able to set when
running the tests. AM_TESTS_ENVIRONMENT is for the tests’ Makefile to
set itself.

https://www.gnu.org/software/automake/manual/html_node/Scripts_002dbased-Testsuites.html

Signed-off-by: Philip Withnall <withnall@endlessm.com>

https://bugzilla.gnome.org/show_bug.cgi?id=782996

It's unnecessary, and only adds visual noise; we have been fairly
inconsistent in the past, but the semi-colon-less version clearly
dominates in the code base.

https://bugzilla.gnome.org/show_bug.cgi?id=669355

rand() is in the C library and some C libraries (uclibc, for example) end up
with rand() defined even if stdlib.h isn't included explicitly.

https://bugzilla.gnome.org/show_bug.cgi?id=774421

https://bugzilla.gnome.org/show_bug.cgi?id=711047

Recent changes to the properties testcase made invalid use of the GArray
free function.  This free function takes a pointer to the item to be
freed, not the item itself.  Since that item was a pointer to a GObject,
g_object_unref() was getting a GObject**, rather than a GObject*.

The use of GArray in this testcase is pretty questionable in the first
place, so just use C arrays instead.