diff --git a/activerecord/test/cases/associations/required_test.rb b/activerecord/test/cases/associations/required_test.rb
index 0daa35ea83..45e1803858 100644
--- a/activerecord/test/cases/associations/required_test.rb
+++ b/activerecord/test/cases/associations/required_test.rb
@@ -23,18 +23,20 @@ class RequiredAssociationsTest < ActiveRecord::TestCase
   end
 
   test "belongs_to associations can be optional by default" do
-    original_value = ActiveRecord::Base.belongs_to_required_by_default
-    ActiveRecord::Base.belongs_to_required_by_default = false
+    begin
+      original_value = ActiveRecord::Base.belongs_to_required_by_default
+      ActiveRecord::Base.belongs_to_required_by_default = false
 
-    model = subclass_of(Child) do
-      belongs_to :parent, inverse_of: false,
-        class_name: "RequiredAssociationsTest::Parent"
+      model = subclass_of(Child) do
+        belongs_to :parent, inverse_of: false,
+          class_name: "RequiredAssociationsTest::Parent"
+      end
+
+      assert model.new.save
+      assert model.new(parent: Parent.new).save
+    ensure
+      ActiveRecord::Base.belongs_to_required_by_default = original_value
     end
-
-    assert model.new.save
-    assert model.new(parent: Parent.new).save
-
-    ActiveRecord::Base.belongs_to_required_by_default = original_value
   end
 
   test "required belongs_to associations have presence validated" do
@@ -52,22 +54,24 @@ class RequiredAssociationsTest < ActiveRecord::TestCase
   end
 
   test "belongs_to associations can be required by default" do
-    original_value = ActiveRecord::Base.belongs_to_required_by_default
-    ActiveRecord::Base.belongs_to_required_by_default = true
+    begin
+      original_value = ActiveRecord::Base.belongs_to_required_by_default
+      ActiveRecord::Base.belongs_to_required_by_default = true
 
-    model = subclass_of(Child) do
-      belongs_to :parent, inverse_of: false,
-        class_name: "RequiredAssociationsTest::Parent"
+      model = subclass_of(Child) do
+        belongs_to :parent, inverse_of: false,
+          class_name: "RequiredAssociationsTest::Parent"
+      end
+
+      record = model.new
+      assert_not record.save
+      assert_equal ["Parent must exist"], record.errors.full_messages
+
+      record.parent = Parent.new
+      assert record.save
+    ensure
+      ActiveRecord::Base.belongs_to_required_by_default = original_value
     end
-
-    record = model.new
-    assert_not record.save
-    assert_equal ["Parent must exist"], record.errors.full_messages
-
-    record.parent = Parent.new
-    assert record.save
-
-    ActiveRecord::Base.belongs_to_required_by_default = original_value
   end
 
   test "has_one associations are not required by default" do