[Fix rubocop#764] Fix an incorrect autocorrect for Rails/FreezeTime

Fixes rubocop#764.

This PR fixes an incorrect autocorrect for `Rails/FreezeTime` when
using `travel_to` with an argument of the current time and proc argument.

changelog/fix_an_incorrect_autocorrect_for_rails_freeze_time.md

@@ -0,0 +1 @@
+* [#764](https://github.com/rubocop/rubocop-rails/issues/764): Fix an incorrect autocorrect for `Rails/FreezeTime` when using `travel_to` with an argument of the current time and proc argument. ([@koic][])

lib/rubocop/cop/rails/freeze_time.rb

@@ -46,7 +46,11 @@ def on_send(node)
           child_node, method_name = *node.first_argument.children
           return unless current_time?(child_node, method_name) || current_time_with_convert?(child_node, method_name)
 
-          add_offense(node) { |corrector| corrector.replace(node, 'freeze_time') }
+          add_offense(node) do |corrector|
+            last_argument = node.last_argument
+            freeze_time_method = last_argument.block_pass_type? ? "freeze_time(#{last_argument.source})" : 'freeze_time'
+            corrector.replace(node, freeze_time_method)
+          end
         end
 
         private

spec/rubocop/cop/rails/freeze_time_spec.rb

@@ -56,6 +56,21 @@
     RUBY
   end
 
+  it 'registers an offense when using `travel_to` with an argument of the current time and proc argument' do
+    expect_offense(<<~RUBY)
+      around do |example|
+        travel_to(Time.current, &example)
+        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use `freeze_time` instead of `travel_to`.
+      end
+    RUBY
+
+    expect_correction(<<~RUBY)
+      around do |example|
+        freeze_time(&example)
+      end
+    RUBY
+  end
+
   it 'does not register an offense when using `freeze_time`' do
     expect_no_offenses(<<~RUBY)
       freeze_time