Adopt rubocop-performance plugin

Author: sferik

.rubocop.yml

@@ -1,5 +1,6 @@
 plugins:
   - rubocop-capybara
+  - rubocop-performance
   - rubocop-rake
 
 AllCops:

Gemfile

@@ -14,6 +14,7 @@ group :development do
   if RUBY_VERSION > "3.2"
     gem "rubocop"
     gem "rubocop-capybara"
+    gem "rubocop-performance"
     gem "rubocop-rake"
   end
   gem "test-unit"

Gemfile.lock

@@ -158,6 +158,10 @@ GEM
     rubocop-capybara (2.23.0)
       lint_roller (~> 1.1)
       rubocop (~> 1.81)
+    rubocop-performance (1.26.1)
+      lint_roller (~> 1.1)
+      rubocop (>= 1.75.0, < 2.0)
+      rubocop-ast (>= 1.47.1, < 2.0)
     rubocop-rake (0.7.1)
       lint_roller (~> 1.1)
       rubocop (>= 1.72.1)
@@ -202,6 +206,7 @@ DEPENDENCIES
   rspec
   rubocop
   rubocop-capybara
+  rubocop-performance
   rubocop-rake
   simplecov!
   test-unit

lib/simplecov/file_list.rb

@@ -45,14 +45,14 @@ def missed_lines
     def never_lines
       return 0.0 if empty?
 
-      map { |f| f.never_lines.count }.inject(:+)
+      sum { |f| f.never_lines.count }
     end
 
     # Returns the count of skipped lines
     def skipped_lines
       return 0.0 if empty?
 
-      map { |f| f.skipped_lines.count }.inject(:+)
+      sum { |f| f.skipped_lines.count }
     end
 
     # Computes the coverage based upon lines covered and lines missed for each file

spec/result_spec.rb

@@ -231,7 +231,7 @@
         expect(result.size).to eq 2
         sorted = result.sort_by(&:command_name)
         expect(sorted.map(&:command_name)).to eq %w[cucumber rspec]
-        expect(sorted.map(&:created_at).map(&:to_i)).to eq [created_at, created_at]
+        expect(sorted.map { |r| r.created_at.to_i }).to eq [created_at, created_at]
         expect(sorted.map(&:original_result)).to eq [other_result, original_result]
       end
     end

spec/source_file_spec.rb

@@ -909,7 +909,7 @@
       end
 
       it "has 5 branches marked as skipped" do
-        expect(subject.branches.select(&:skipped?).size).to eq 5
+        expect(subject.branches.count(&:skipped?)).to eq 5
       end
     end
   end
@@ -1198,7 +1198,7 @@ def build(coverage_data, source_lines)
       end
 
       it "skips any branch whose range overlaps the disabled region" do
-        expect(subject.branches.select(&:skipped?).size).to eq 2
+        expect(subject.branches.count(&:skipped?)).to eq 2
         expect(subject.total_branches).to eq []
       end