meson: gio/tests: add more missing tests

gobject/tests/meson.build

@@ -17,9 +17,17 @@ gobject_tests = [
   'ifaceproperties',
 ]
 
+# FIXME: use new environment() object
+# FIXME: put common bits of test environment() in one location
+# Not entirely random of course, but at least it changes over time
+random_number = minor_version.to_int() + meson.version().split('.').get(1).to_int()
+
 test_env = [
   'G_TEST_SRCDIR=' + meson.current_source_dir(),
   'G_TEST_BUILDDIR=' + meson.current_build_dir(),
+  'G_DEBUG=gc-friendly',
+  'MALLOC_CHECK_=2',
+  'MALLOC_PERTURB_=@0@'.format(random_number % 256),
 ]
 
 foreach test_name : gobject_tests