diff --git a/t/support.t b/t/support.t
index 1e9a24a6e..bee1987f1 100644
--- a/t/support.t
+++ b/t/support.t
@@ -14,8 +14,24 @@ use Slic3r::Test;
     my $config = Slic3r::Config->new_from_defaults;
     $config->set('raft_layers', 3);
     $config->set('brim_width',  6);
+    $config->set('skirts', 0);
+    $config->set('support_material_extruder', 2);
+    $config->set('layer_height', 0.4);
+    $config->set('first_layer_height', '100%');
     my $print = Slic3r::Test::init_print('20mm_cube', config => $config);
-    ok Slic3r::Test::gcode($print), 'no conflict between raft/support and brim';
+    ok my $gcode = Slic3r::Test::gcode($print), 'no conflict between raft/support and brim';
+    
+    my $tool = 0;
+    Slic3r::GCode::Reader->new(gcode => $gcode)->parse(sub {
+        my ($self, $cmd, $args, $info) = @_;
+        
+        if ($cmd =~ /^T(\d+)/) {
+            $tool = $1;
+        } elsif ($info->{extruding} && $self->Z <= ($config->raft_layers * $config->layer_height)) {
+            fail 'not extruding raft/brim with support material extruder'
+                if $tool != ($config->support_material_extruder-1);
+        }
+    });
 }
 
 __END__