Add test case for clear mappings

1 files changed, 10 insertions, 0 deletions

diff --git a/activerecord/test/cases/connection_adapters/type/type_map_test.rb b/activerecord/test/cases/connection_adapters/type/type_map_test.rb
index 3abd7a276e..e85bbc8dc7 100644
--- a/activerecord/test/cases/connection_adapters/type/type_map_test.rb
+++ b/activerecord/test/cases/connection_adapters/type/type_map_test.rb
@@ -125,6 +125,16 @@ module ActiveRecord
           assert_equal mapping.lookup(3), 'string'
           assert_kind_of Type::Value, mapping.lookup(4)
         end
+
+        def test_clear_mappings
+          time = Time.new
+          mapping = TypeMap.new
+
+          mapping.register_type(/time/i, time)
+          mapping.clear
+
+          assert_not_equal mapping.lookup('time'), time
+        end
       end
     end
   end