1 files changed, 22 insertions, 0 deletions
diff --git a/activemodel/test/cases/railtie_test.rb b/activemodel/test/cases/railtie_test.rb
index a56b26b5ee..ab60285e2a 100644
--- a/activemodel/test/cases/railtie_test.rb
+++ b/activemodel/test/cases/railtie_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "cases/helper"
 require "active_support/testing/isolation"
 
@@ -29,4 +31,24 @@ class RailtieTest < ActiveModel::TestCase
 
     assert_equal true, ActiveModel::SecurePassword.min_cost
   end
+
+  test "i18n full message defaults to false" do
+    @app.initialize!
+
+    assert_equal false, ActiveModel::Errors.i18n_full_message
+  end
+
+  test "i18n full message can be disabled" do
+    @app.config.active_model.i18n_full_message = false
+    @app.initialize!
+
+    assert_equal false, ActiveModel::Errors.i18n_full_message
+  end
+
+  test "i18n full message can be enabled" do
+    @app.config.active_model.i18n_full_message = true
+    @app.initialize!
+
+    assert_equal true, ActiveModel::Errors.i18n_full_message
+  end
 end