1 files changed, 20 insertions, 2 deletions
diff --git a/activesupport/test/inflector_test.rb b/activesupport/test/inflector_test.rb
index a0764f6d6b..06cd41c86d 100644
--- a/activesupport/test/inflector_test.rb
+++ b/activesupport/test/inflector_test.rb
@@ -269,14 +269,32 @@ class InflectorTest < ActiveSupport::TestCase
   def test_parameterize_with_custom_separator
     jruby_skip "UTF-8 to UTF8-MAC Converter is unavailable"
     StringToParameterizeWithUnderscore.each do |some_string, parameterized_string|
-      assert_equal(parameterized_string, ActiveSupport::Inflector.parameterize(some_string, '_'))
+      assert_equal(parameterized_string, ActiveSupport::Inflector.parameterize(some_string, separator: '_'))
+    end
+  end
+
+  def test_parameterize_with_custom_separator_deprecated
+    jruby_skip "UTF-8 to UTF8-MAC Converter is unavailable"
+    StringToParameterizeWithUnderscore.each do |some_string, parameterized_string|
+      assert_deprecated(/Passing the separator argument as a positional parameter is deprecated and will soon be removed. Use `separator: '_'` instead./i) do
+        assert_equal(parameterized_string, ActiveSupport::Inflector.parameterize(some_string, '_'))
+      end
     end
   end
 
   def test_parameterize_with_multi_character_separator
     jruby_skip "UTF-8 to UTF8-MAC Converter is unavailable"
     StringToParameterized.each do |some_string, parameterized_string|
-      assert_equal(parameterized_string.gsub('-', '__sep__'), ActiveSupport::Inflector.parameterize(some_string, '__sep__'))
+      assert_equal(parameterized_string.gsub('-', '__sep__'), ActiveSupport::Inflector.parameterize(some_string, separator: '__sep__'))
+    end
+  end
+
+  def test_parameterize_with_multi_character_separator_deprecated
+    jruby_skip "UTF-8 to UTF8-MAC Converter is unavailable"
+    StringToParameterized.each do |some_string, parameterized_string|
+      assert_deprecated(/Passing the separator argument as a positional parameter is deprecated and will soon be removed. Use `separator: '__sep__'` instead./i) do
+        assert_equal(parameterized_string.gsub('-', '__sep__'), ActiveSupport::Inflector.parameterize(some_string, '__sep__'))
+      end
     end
   end