diff --git a/test/unit/repository_mercurial_test.rb b/test/unit/repository_mercurial_test.rb
index 27e45fcc1..d8daf0f9a 100644
--- a/test/unit/repository_mercurial_test.rb
+++ b/test/unit/repository_mercurial_test.rb
@@ -102,6 +102,7 @@ class RepositoryMercurialTest < ActiveSupport::TestCase
       @repository.reload
 
       cs1 = @repository.changesets.find_by_revision('13')
+      assert_not_nil cs1
       c1  = cs1.changes
       assert_equal 2, c1.size