diff --git a/test/unit/repository_mercurial_test.rb b/test/unit/repository_mercurial_test.rb
index ae106d884..9a740ec1a 100644
--- a/test/unit/repository_mercurial_test.rb
+++ b/test/unit/repository_mercurial_test.rb
@@ -34,8 +34,14 @@ class RepositoryMercurialTest < ActiveSupport::TestCase
                       )
     assert @repository
     @char_1        = CHAR_1_HEX.dup
+    @tag_char_1    = "tag-#{CHAR_1_HEX}-00"
+    @branch_char_0 = "branch-#{CHAR_1_HEX}-00"
+    @branch_char_1 = "branch-#{CHAR_1_HEX}-01"
     if @char_1.respond_to?(:force_encoding)
       @char_1.force_encoding('UTF-8')
+      @tag_char_1.force_encoding('UTF-8')
+      @branch_char_0.force_encoding('UTF-8')
+      @branch_char_1.force_encoding('UTF-8')
     end
   end