diff --git a/test/controllers/users_controller_test.rb b/test/controllers/users_controller_test.rb
index ff7ec0f2c..fad78128f 100644
--- a/test/controllers/users_controller_test.rb
+++ b/test/controllers/users_controller_test.rb
@@ -5,8 +5,8 @@ class UsersControllerTest < ActionDispatch::IntegrationTest
     sign_in_as :kevin
 
     get users_path
-    assert_match /#{users(:david).name}/, @response.body
-    assert_match /#{users(:kevin).name}/, @response.body
+    assert_in_body users(:david).name
+    assert_in_body users(:kevin).name
   end
 
   test "new" do
@@ -32,7 +32,7 @@ class UsersControllerTest < ActionDispatch::IntegrationTest
     sign_in_as :kevin
 
     get user_path(users(:david))
-    assert_match /#{users(:david).name}/, @response.body
+    assert_in_body users(:david).name
   end
 
   test "update oneself" do
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 1447430b1..dd27bd4ca 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -11,5 +11,15 @@ module ActiveSupport
     fixtures :all
 
     include CardTestHelper, ChangeTestHelper, SessionTestHelper
+
+    # FIXME: Remove when upstream in Rails has landed (https://github.com/rails/rails/pull/54938)
+    def assert_in_body(text)
+      assert_match /#{text}/, @response.body
+    end
+
+    # FIXME: Remove when upstream in Rails has landed (https://github.com/rails/rails/pull/54938)
+    def assert_not_in_body(text)
+      assert_no_match /#{text}/, @response.body
+    end
   end
 end