4 files changed, 7 insertions, 7 deletions
diff --git a/activemodel/test/cases/attributes_dirty_test.rb b/activemodel/test/cases/attributes_dirty_test.rb
index c991176389..f9693a23cd 100644
--- a/activemodel/test/cases/attributes_dirty_test.rb
+++ b/activemodel/test/cases/attributes_dirty_test.rb
@@ -39,7 +39,7 @@ class AttributesDirtyTest < ActiveModel::TestCase
   end
 
   test "changes to attribute values" do
-    assert !@model.changes["name"]
+    assert_not @model.changes["name"]
     @model.name = "John"
     assert_equal [nil, "John"], @model.changes["name"]
   end
diff --git a/activemodel/test/cases/dirty_test.rb b/activemodel/test/cases/dirty_test.rb
index f769eb0da1..b120e68027 100644
--- a/activemodel/test/cases/dirty_test.rb
+++ b/activemodel/test/cases/dirty_test.rb
@@ -78,7 +78,7 @@ class DirtyTest < ActiveModel::TestCase
   end
 
   test "changes to attribute values" do
-    assert !@model.changes["name"]
+    assert_not @model.changes["name"]
     @model.name = "John"
     assert_equal [nil, "John"], @model.changes["name"]
   end
diff --git a/activemodel/test/cases/errors_test.rb b/activemodel/test/cases/errors_test.rb
index cb6a8c43d5..6ff3be1308 100644
--- a/activemodel/test/cases/errors_test.rb
+++ b/activemodel/test/cases/errors_test.rb
@@ -207,26 +207,26 @@ class ErrorsTest < ActiveModel::TestCase
 
   test "added? returns false when no errors are present" do
     person = Person.new
-    assert !person.errors.added?(:name)
+    assert_not person.errors.added?(:name)
   end
 
   test "added? returns false when checking a nonexisting error and other errors are present for the given attribute" do
     person = Person.new
     person.errors.add(:name, "is invalid")
-    assert !person.errors.added?(:name, "cannot be blank")
+    assert_not person.errors.added?(:name, "cannot be blank")
   end
 
   test "added? returns false when checking for an error, but not providing message arguments" do
     person = Person.new
     person.errors.add(:name, "cannot be blank")
-    assert !person.errors.added?(:name)
+    assert_not person.errors.added?(:name)
   end
 
   test "added? returns false when checking for an error by symbol and a different error with same message is present" do
     I18n.backend.store_translations("en", errors: { attributes: { name: { wrong: "is wrong", used: "is wrong" } } })
     person = Person.new
     person.errors.add(:name, :wrong)
-    assert !person.errors.added?(:name, :used)
+    assert_not person.errors.added?(:name, :used)
   end
 
   test "size calculates the number of error messages" do
diff --git a/activemodel/test/cases/secure_password_test.rb b/activemodel/test/cases/secure_password_test.rb
index d19e81a119..912cb6d5ab 100644
--- a/activemodel/test/cases/secure_password_test.rb
+++ b/activemodel/test/cases/secure_password_test.rb
@@ -187,7 +187,7 @@ class SecurePasswordTest < ActiveModel::TestCase
   test "authenticate" do
     @user.password = "secret"
 
-    assert !@user.authenticate("wrong")
+    assert_not @user.authenticate("wrong")
     assert @user.authenticate("secret")
   end