diff --git a/testcases/t/lib/i3test.pm b/testcases/t/lib/i3test.pm
index 83b48e11..79ca0266 100644
--- a/testcases/t/lib/i3test.pm
+++ b/testcases/t/lib/i3test.pm
@@ -10,7 +10,7 @@ use List::Util qw(first);
 use v5.10;
 
 use Exporter ();
-our @EXPORT = qw(get_workspace_names get_unused_workspace get_ws_content get_ws get_focused open_empty_con open_standard_window);
+our @EXPORT = qw(get_workspace_names get_unused_workspace get_ws_content get_ws get_focused open_empty_con open_standard_window cmd);
 
 BEGIN {
     my $window_count = 0;
@@ -119,4 +119,8 @@ sub get_focused {
     return $lf;
 }
 
+sub cmd {
+    i3("/tmp/nestedcons")->command(@_)->recv
+}
+
 1