rubocop/no_fileutils_rmrf: Extend to cover FileUtils#rmtree too

Library/Homebrew/rubocops/no_fileutils_rmrf.rb

@@ -4,21 +4,26 @@
 module RuboCop
   module Cop
     module Homebrew
-      # This cop checks for the use of `FileUtils.rm_f` or `FileUtils.rm_rf` and recommends the non-`f` versions.
+      # This cop checks for the use of `FileUtils.rm_f`, `FileUtils.rm_rf`, or `FileUtils.rmtree`
+      # and recommends the non-`f` versions.
       class NoFileutilsRmrf < Base
         extend AutoCorrector
 
-        MSG = "Use `FileUtils.rm` or `FileUtils.rm_f` instead of `FileUtils.rm_rf` or `FileUtils.rm_f`."
+        MSG = "Use `FileUtils.rm`, `FileUtils.rm_r` instead of `FileUtils.rm_rf`, `FileUtils.rm_f`, or `FileUtils.rmtree`."
 
         def_node_matcher :fileutils_rm_r_f?, <<~PATTERN
-          (send (const {nil? cbase} :FileUtils) {:rm_rf :rm_f} ...)
+          (send (const {nil? cbase} :FileUtils) {:rm_rf :rm_f :rmtree} ...)
         PATTERN
 
         def on_send(node)
           return unless fileutils_rm_r_f?(node)
 
           add_offense(node) do |corrector|
-            new_method = node.method?(:rm_rf) ? "rm_r" : "rm"
+            new_method = if node.method?(:rm_rf) || node.method?(:rmtree)
+              "rm_r"
+            else
+              "rm"
+            end
             corrector.replace(node.loc.expression, "FileUtils.#{new_method}(#{node.arguments.first.source})")
           end
         end

Library/Homebrew/test/rubocops/no_fileutils_rmrf_spec.rb

@@ -19,6 +19,13 @@ RSpec.describe RuboCop::Cop::Homebrew::NoFileutilsRmrf do
     RUBY
   end
 
+  it "registers an offense when using FileUtils.rmtree" do
+    expect_offense(<<~RUBY)
+      FileUtils.rmtree("path/to/directory")
+      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Homebrew/NoFileutilsRmrf: #{RuboCop::Cop::Homebrew::NoFileutilsRmrf::MSG}
+    RUBY
+  end
+
   it "autocorrects" do
     corrected = autocorrect_source(<<~RUBY)
       FileUtils.rm_rf("path/to/directory")