1 files changed, 51 insertions, 0 deletions
diff --git a/activerecord/test/cases/ar_schema_test.rb b/activerecord/test/cases/ar_schema_test.rb
index 98af75e8ca..9d88b14dab 100644
--- a/activerecord/test/cases/ar_schema_test.rb
+++ b/activerecord/test/cases/ar_schema_test.rb
@@ -157,4 +157,55 @@ class ActiveRecordSchemaTest < ActiveRecord::TestCase
     assert @connection.column_exists?(:has_timestamps, :created_at, null: false)
     assert @connection.column_exists?(:has_timestamps, :updated_at, null: false)
   end
+
+  if subsecond_precision_supported?
+    def test_timestamps_sets_presicion_on_create_table
+      ActiveRecord::Schema.define do
+        create_table :has_timestamps do |t|
+          t.timestamps
+        end
+      end
+
+      assert @connection.column_exists?(:has_timestamps, :created_at, precision: 6, null: false)
+      assert @connection.column_exists?(:has_timestamps, :updated_at, precision: 6, null: false)
+    end
+
+    def test_timestamps_sets_presicion_on_change_table
+      ActiveRecord::Schema.define do
+        create_table :has_timestamps
+
+        change_table :has_timestamps do |t|
+          t.timestamps default: Time.now
+        end
+      end
+
+      assert @connection.column_exists?(:has_timestamps, :created_at, precision: 6, null: false)
+      assert @connection.column_exists?(:has_timestamps, :updated_at, precision: 6, null: false)
+    end
+
+    if ActiveRecord::Base.connection.supports_bulk_alter?
+      def test_timestamps_sets_presicion_on_change_table_with_bulk
+        ActiveRecord::Schema.define do
+          create_table :has_timestamps
+
+          change_table :has_timestamps, bulk: true do |t|
+            t.timestamps default: Time.now
+          end
+        end
+
+        assert @connection.column_exists?(:has_timestamps, :created_at, precision: 6, null: false)
+        assert @connection.column_exists?(:has_timestamps, :updated_at, precision: 6, null: false)
+      end
+    end
+
+    def test_timestamps_sets_presicion_on_add_timestamps
+      ActiveRecord::Schema.define do
+        create_table :has_timestamps
+        add_timestamps :has_timestamps, default: Time.now
+      end
+
+      assert @connection.column_exists?(:has_timestamps, :created_at, precision: 6, null: false)
+      assert @connection.column_exists?(:has_timestamps, :updated_at, precision: 6, null: false)
+    end
+  end
 end