diff --git a/lib/JapaChar/Random.pm b/lib/JapaChar/Random.pm
index e6456e6..608ebd8 100644
--- a/lib/JapaChar/Random.pm
+++ b/lib/JapaChar/Random.pm
@@ -9,7 +9,7 @@ use Moo;
 
 use Crypt::URandom qw( urandom );
 
-sub get($min = 1, $max = 100) {
+sub get($class, $min = 1, $max = 100) {
     my $rng = urandom(4);
     $rng = unpack 'L', $rng;
     $rng = ($rng % $max) + $min;
diff --git a/t/01-characters.t b/t/01-characters.t
index 0744a52..ac4bb40 100644
--- a/t/01-characters.t
+++ b/t/01-characters.t
@@ -5,7 +5,7 @@ use v5.38.2;
 use strict;
 use warnings;
 
-use Test::Most tests => 2;
+use Test::Most tests => 3;
 use Test::MockModule;
 use Path::Tiny;
 
@@ -14,6 +14,7 @@ use File::Basename;
 use lib dirname(dirname(__FILE__)).'/lib';
 
 use JapaChar::DB;
+use JapaChar::Random;
 
 BEGIN {
     use_ok 'JapaChar::Characters';
@@ -24,5 +25,16 @@ BEGIN {
     $mock_db->mock(_db_path => sub {
         return path(__FILE__)->parent->child('all-learned-basic-characters.db');
     });
+    my $mock_random = Test::MockModule->new('JapaChar::Random');
+    $mock_random->mock(get => sub {
+        return 100;
+    });
+    my $mock_characters = Test::MockModule->new('JapaChar::Characters');
+    my $called_next_review_char = 0;
+    $mock_characters->mock(_next_review_char => sub {
+        $called_next_review_char = 1;
+        return $mock_characters->original('_next_review_char')->(@_);
+    });
     ok defined(JapaChar::Characters->new->next_char), 'The next char is defined.';
+    ok $called_next_review_char, 'The next char is a review.';
 }