diff --git a/t/lib/TestBuilder.pm b/t/lib/TestBuilder.pm
index 72f2b4c04d..d342ba33a5 100644
--- a/t/lib/TestBuilder.pm
+++ b/t/lib/TestBuilder.pm
@@ -575,6 +575,12 @@ sub _gen_blob {
 sub _gen_default_values {
     my ($self) = @_;
     return {
+        ArticleRequest => {
+            format => sub {
+                my $formats = C4::Context->multivalue_preference('ArticleRequestsSupportedFormats');
+                return $formats->[ int( rand( scalar @$formats ) ) ];
+            }
+            },
         AuthorisedValueCategory => {
             is_integer_only => 0,
         },