1 files changed, 64 insertions, 0 deletions
diff --git a/activerecord/test/cases/mixin_test.rb b/activerecord/test/cases/mixin_test.rb
new file mode 100644
index 0000000000..fdb8ac6ab3
--- /dev/null
+++ b/activerecord/test/cases/mixin_test.rb
@@ -0,0 +1,64 @@
+# frozen_string_literal: true
+
+require "cases/helper"
+
+class Mixin < ActiveRecord::Base
+end
+
+class TouchTest < ActiveRecord::TestCase
+  fixtures :mixins
+
+  setup do
+    travel_to Time.now
+  end
+
+  def test_update
+    stamped = Mixin.new
+
+    assert_nil stamped.updated_at
+    assert_nil stamped.created_at
+    stamped.save
+    assert_equal Time.now, stamped.updated_at
+    assert_equal Time.now, stamped.created_at
+  end
+
+  def test_create
+    obj = Mixin.create
+    assert_equal Time.now, obj.updated_at
+    assert_equal Time.now, obj.created_at
+  end
+
+  def test_many_updates
+    stamped = Mixin.new
+
+    assert_nil stamped.updated_at
+    assert_nil stamped.created_at
+    stamped.save
+    assert_equal Time.now, stamped.created_at
+    assert_equal Time.now, stamped.updated_at
+
+    old_updated_at = stamped.updated_at
+
+    travel 5.minutes
+    stamped.lft_will_change!
+    stamped.save
+
+    assert_equal Time.now, stamped.updated_at
+    assert_equal old_updated_at, stamped.created_at
+  end
+
+  def test_create_turned_off
+    Mixin.record_timestamps = false
+
+    mixin = Mixin.new
+
+    assert_nil mixin.updated_at
+    mixin.save
+    assert_nil mixin.updated_at
+
+  # Make sure Mixin.record_timestamps gets reset, even if this test fails,
+  # so that other tests do not fail because Mixin.record_timestamps == false
+  ensure
+    Mixin.record_timestamps = true
+  end
+end