Merge pull request rubocop#810 from koic/fix_error_for_rails_freeze_time

[Fix rubocop#809] Fix an error for `Rails/FreezeTime`

Author: koic

changelog/fix_an_error_for_rails_freeze_time.md

@@ -0,0 +1 @@
+* [#809](https://github.com/rubocop/rubocop-rails/issues/809): Fix an error for `Rails/FreezeTime` when using `travel_to` without argument. ([@koic][])

lib/rubocop/cop/rails/freeze_time.rb

@@ -43,7 +43,7 @@ class FreezeTime < Base
         PATTERN
 
         def on_send(node)
-          child_node, method_name, time_argument = *node.first_argument.children
+          child_node, method_name, time_argument = *node.first_argument&.children
           return if time_argument || !child_node
           return unless current_time?(child_node, method_name) || current_time_with_convert?(child_node, method_name)
 

spec/rubocop/cop/rails/freeze_time_spec.rb

@@ -97,4 +97,10 @@
       travel_to(DateTime.new(2022, 5, 3, 12, 0, 0))
     RUBY
   end
+
+  it 'does not register an offense when using `travel_to` without argument' do
+    expect_no_offenses(<<~RUBY)
+      travel_to
+    RUBY
+  end
 end