1 files changed, 12 insertions, 2 deletions
diff --git a/activemodel/test/cases/errors_test.rb b/activemodel/test/cases/errors_test.rb
index da99a0eca0..95ca1f3969 100644
--- a/activemodel/test/cases/errors_test.rb
+++ b/activemodel/test/cases/errors_test.rb
@@ -37,7 +37,7 @@ class ErrorsTest < ActiveModel::TestCase
   def test_include?
     errors = ActiveModel::Errors.new(self)
     errors[:foo] << "omg"
-    assert errors.include?(:foo), "errors should include :foo"
+    assert_includes errors, :foo, "errors should include :foo"
   end
 
   def test_dup
@@ -125,7 +125,7 @@ class ErrorsTest < ActiveModel::TestCase
     person.errors[:foo]
     assert person.errors.empty?
     assert person.errors.blank?
-    assert !person.errors.include?(:foo)
+    assert_not_includes person.errors, :foo
   end
 
   test "include? does not add a key to messages hash" do
@@ -250,6 +250,16 @@ class ErrorsTest < ActiveModel::TestCase
     assert_equal({ name: ["cannot be blank"] }, person.errors.to_hash)
   end
 
+  test "to_hash returns a hash without default proc" do
+    person = Person.new
+    assert_nil person.errors.to_hash.default_proc
+  end
+
+  test "as_json returns a hash without default proc" do
+    person = Person.new
+    assert_nil person.errors.as_json.default_proc
+  end
+
   test "full_messages creates a list of error messages with the attribute name included" do
     person = Person.new
     person.errors.add(:name, "cannot be blank")