Add tests for sanitize named bind arity

activerecord/test/cases/finder_test.rb

@@ -721,6 +721,12 @@ def test_named_bind_variables
     assert_kind_of Time, Topic.where(["id = :id", { id: 1 }]).first.written_on
   end
 
+  def test_named_bind_arity
+    assert_nothing_raised                                { bind "name = :name", { name: "37signals" } }
+    assert_nothing_raised                                { bind "name = :name", { name: "37signals", id: 1 } }
+    assert_raise(ActiveRecord::PreparedStatementInvalid) { bind "name = :name", { id: 1 } }
+  end
+
   class SimpleEnumerable
     include Enumerable