diff --git a/core/modules/block/tests/modules/block_test/themes/block_test_specialchars_theme/block_test_specialchars_theme.info.yml b/core/modules/block/tests/modules/block_test/themes/block_test_specialchars_theme/block_test_specialchars_theme.info.yml
index 5b4689e..607451f 100644
--- a/core/modules/block/tests/modules/block_test/themes/block_test_specialchars_theme/block_test_specialchars_theme.info.yml
+++ b/core/modules/block/tests/modules/block_test/themes/block_test_specialchars_theme/block_test_specialchars_theme.info.yml
@@ -2,7 +2,6 @@ name: '<"Cat" & ''Mouse''>'
 type: theme
 description: 'Theme for testing special characters in block admin.'
 core: 8.x
-hidden: true
 regions:
   content: Content
   help: Help
diff --git a/core/modules/config/tests/config_import_test/config_import_test.info.yml b/core/modules/config/tests/config_import_test/config_import_test.info.yml
index 87cdd02..01d2d1d 100644
--- a/core/modules/config/tests/config_import_test/config_import_test.info.yml
+++ b/core/modules/config/tests/config_import_test/config_import_test.info.yml
@@ -3,4 +3,3 @@ type: module
 package: Testing
 version: VERSION
 core: 8.x
-hidden: true
diff --git a/core/modules/config/tests/config_override_test/config_override_test.yml b/core/modules/config/tests/config_override_test/config_override_test.yml
index 1ccb50b..f1f1109 100644
--- a/core/modules/config/tests/config_override_test/config_override_test.yml
+++ b/core/modules/config/tests/config_override_test/config_override_test.yml
@@ -3,4 +3,3 @@ type: module
 package: Testing
 version: VERSION
 core: 8.x
-hidden: true
diff --git a/core/modules/locale/tests/modules/locale_test/locale_test.info.yml b/core/modules/locale/tests/modules/locale_test/locale_test.info.yml
index ca4211d..c65b31b 100644
--- a/core/modules/locale/tests/modules/locale_test/locale_test.info.yml
+++ b/core/modules/locale/tests/modules/locale_test/locale_test.info.yml
@@ -4,6 +4,5 @@ description: 'Support module for locale module testing.'
 package: Testing
 version: '1.2'
 core: 8.x
-hidden: true
 'interface translation project': locale_test
 'interface translation server pattern': core/modules/locale/test/test.%language.po
diff --git a/core/modules/locale/tests/modules/locale_test_translate/locale_test_translate.info.yml b/core/modules/locale/tests/modules/locale_test_translate/locale_test_translate.info.yml
index d703b0d..b7dd382 100644
--- a/core/modules/locale/tests/modules/locale_test_translate/locale_test_translate.info.yml
+++ b/core/modules/locale/tests/modules/locale_test_translate/locale_test_translate.info.yml
@@ -4,6 +4,5 @@ description: 'Translation test module for locale module testing.'
 package: Testing
 version: '1.3'
 core: 8.x
-hidden: true
 'interface translation project': locale_test_translate
 'interface translation server pattern': core/modules/locale/tests/test.%language.po
diff --git a/core/modules/quickedit/tests/modules/quickedit_test.info.yml b/core/modules/quickedit/tests/modules/quickedit_test.info.yml
index 91c40bd..fe21dc5 100644
--- a/core/modules/quickedit/tests/modules/quickedit_test.info.yml
+++ b/core/modules/quickedit/tests/modules/quickedit_test.info.yml
@@ -4,4 +4,3 @@ description: 'Support module for the Quick Edit module tests.'
 core: 8.x
 package: Testing
 version: VERSION
-hidden: true