diff --git a/tests/unit/style/properties/serialization.rs b/tests/unit/style/properties/serialization.rs
index e23a66f4289..535a52daa6d 100644
--- a/tests/unit/style/properties/serialization.rs
+++ b/tests/unit/style/properties/serialization.rs
@@ -1246,55 +1246,4 @@ mod shorthand_serialization {
             assert_eq!(counter_increment.to_css_string(), counter_increment_css);
         }
     }
-
-    #[test]
-    fn place_content_serialize_all_available_properties() {
-        use style::properties::longhands::align_content::SpecifiedValue as AlignContent;
-        use style::properties::longhands::justify_content::SpecifiedValue as JustifyContent;
-
-        let mut properties = Vec::new();
-
-        let align = AlignContent::stretch;
-        let justify = JustifyContent::center;
-
-        properties.push(PropertyDeclaration::AlignContent(align));
-        properties.push(PropertyDeclaration::JustifyContent(justify));
-
-        let serialization = shorthand_properties_to_string(properties);
-        assert_eq!(serialization, "place-content: stretch center;");
-    }
-
-    #[test]
-    fn place_self_serialize_all_available_properties() {
-        use style::properties::longhands::align_self::SpecifiedValue as AlignSelf;
-        use style::properties::longhands::justify_self::SpecifiedValue as JustifySelf;
-
-        let mut properties = Vec::new();
-
-        let align = AlignSelf::auto;
-        let justify = JustifySelf::baseline;
-
-        properties.push(PropertyDeclaration::AlignSelf(align));
-        properties.push(PropertyDeclaration::JustifySelf(justify));
-
-        let serialization = shorthand_properties_to_string(properties);
-        assert_eq!(serialization, "place-self: auto baseline;");
-    }
-
-    #[test]
-    fn place_items_serialize_all_available_properties() {
-        use style::properties::longhands::align_items::SpecifiedValue as AlignItems;
-        use style::properties::longhands::justify_items::SpecifiedValue as JustifyItems;
-
-        let mut properties = Vec::new();
-
-        let align = AlignItems::flex_start;
-        let justify = JustifyItems::baseline;
-
-        properties.push(PropertyDeclaration::AlignItems(align));
-        properties.push(PropertyDeclaration::JustifyItems(justify));
-
-        let serialization = shorthand_properties_to_string(properties);
-        assert_eq!(serialization, "place-items: flex-start baseline;");
-    }
 }