1 files changed, 49 insertions, 0 deletions
diff --git a/activerecord/test/cases/adapters/postgresql/domain_test.rb b/activerecord/test/cases/adapters/postgresql/domain_test.rb
new file mode 100644
index 0000000000..9c3817e2ad
--- /dev/null
+++ b/activerecord/test/cases/adapters/postgresql/domain_test.rb
@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+require "cases/helper"
+require "support/connection_helper"
+
+class PostgresqlDomainTest < ActiveRecord::PostgreSQLTestCase
+  include ConnectionHelper
+
+  class PostgresqlDomain < ActiveRecord::Base
+    self.table_name = "postgresql_domains"
+  end
+
+  def setup
+    @connection = ActiveRecord::Base.connection
+    @connection.transaction do
+      @connection.execute "CREATE DOMAIN custom_money as numeric(8,2)"
+      @connection.create_table("postgresql_domains") do |t|
+        t.column :price, :custom_money
+      end
+    end
+  end
+
+  teardown do
+    @connection.drop_table "postgresql_domains", if_exists: true
+    @connection.execute "DROP DOMAIN IF EXISTS custom_money"
+    reset_connection
+  end
+
+  def test_column
+    column = PostgresqlDomain.columns_hash["price"]
+    assert_equal :decimal, column.type
+    assert_equal "custom_money", column.sql_type
+    assert_not column.array?
+
+    type = PostgresqlDomain.type_for_attribute("price")
+    assert_not type.binary?
+  end
+
+  def test_domain_acts_like_basetype
+    PostgresqlDomain.create price: ""
+    record = PostgresqlDomain.first
+    assert_nil record.price
+
+    record.price = "34.15"
+    record.save!
+
+    assert_equal BigDecimal.new("34.15"), record.reload.price
+  end
+end