diff --git a/test/unit/dmsf_file_revision_test.rb b/test/unit/dmsf_file_revision_test.rb
index 19e04e30..d8333d0c 100644
--- a/test/unit/dmsf_file_revision_test.rb
+++ b/test/unit/dmsf_file_revision_test.rb
@@ -127,6 +127,7 @@ class DmsfFileRevisionTest < RedmineDmsf::Test::UnitTest
   end
   
   def test_save_and_destroy_with_cache
+    Setting.plugin_redmine_dmsf['dmsf_webdav_caching_enabled'] = '1'
     Rails.cache.clear
     # save
     cache_key = @revision1.propfind_cache_key
diff --git a/test/unit/dmsf_file_test.rb b/test/unit/dmsf_file_test.rb
index a8958694..45084fb8 100644
--- a/test/unit/dmsf_file_test.rb
+++ b/test/unit/dmsf_file_test.rb
@@ -167,6 +167,7 @@ class DmsfFileTest < RedmineDmsf::Test::UnitTest
   end
   
   def test_save_and_destroy_with_cache
+    Setting.plugin_redmine_dmsf['dmsf_webdav_caching_enabled'] = '1'
     Rails.cache.clear
     # save
     cache_key = @file5.propfind_cache_key
diff --git a/test/unit/dmsf_folder_test.rb b/test/unit/dmsf_folder_test.rb
index f7a89c4b..fc50da32 100644
--- a/test/unit/dmsf_folder_test.rb
+++ b/test/unit/dmsf_folder_test.rb
@@ -143,6 +143,7 @@ class DmsfFolderTest < RedmineDmsf::Test::UnitTest
   end
 
   def test_save_and_destroy_with_cache
+    Setting.plugin_redmine_dmsf['dmsf_webdav_caching_enabled'] = '1'
     Rails.cache.clear
     # save
     cache_key = @folder4.propfind_cache_key