--- /dev/null
+use strict;
+use warnings;
+
+BEGIN {
+ $ENV{RT_TEST_WEB_HANDLER} = 'inline';
+}
+
+use RT::Test tests => undef;
+use Test::Warn;
+
+my ($base, $m) = RT::Test->started_ok;
+
+$m->login;
+$m->content_like(qr/RT at a glance/i, 'homepage');
+
+warning_like {
+ ok !RT->InstallMode(1), 'install mode failed to turn on';
+} qr/tried to turn on InstallMode/;
+
+$m->reload;
+$m->content_like(qr/RT at a glance/i, 'still homepage');
+
+undef $m;
+done_testing;