1 files changed, 29 insertions, 7 deletions
diff --git a/activemodel/test/cases/railtie_test.rb b/activemodel/test/cases/railtie_test.rb
index 96b3b07e50..ab60285e2a 100644
--- a/activemodel/test/cases/railtie_test.rb
+++ b/activemodel/test/cases/railtie_test.rb
@@ -1,11 +1,13 @@
-require 'cases/helper'
-require 'active_support/testing/isolation'
+# frozen_string_literal: true
+
+require "cases/helper"
+require "active_support/testing/isolation"
 
 class RailtieTest < ActiveModel::TestCase
   include ActiveSupport::Testing::Isolation
 
   def setup
-    require 'active_model/railtie'
+    require "active_model/railtie"
 
     # Set a fake logger to avoid creating the log directory automatically
     fake_logger = Logger.new(nil)
@@ -16,17 +18,37 @@ class RailtieTest < ActiveModel::TestCase
     end
   end
 
-  test 'secure password min_cost is false in the development environment' do
-    Rails.env = 'development'
+  test "secure password min_cost is false in the development environment" do
+    Rails.env = "development"
     @app.initialize!
 
     assert_equal false, ActiveModel::SecurePassword.min_cost
   end
 
-  test 'secure password min_cost is true in the test environment' do
-    Rails.env = 'test'
+  test "secure password min_cost is true in the test environment" do
+    Rails.env = "test"
     @app.initialize!
 
     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