Sort runtime_logger output

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- Sort the output of `runtime_logger` for RSpec to show slowest tests first
+
 ### Breaking Changes
 
 ### Added

lib/parallel_tests/rspec/runtime_logger.rb

@@ -36,6 +36,8 @@ def dump_pending(*); end
   def start_dump(*)
     return unless ENV['TEST_ENV_NUMBER'] # only record when running in parallel
     lock_output do
+      # Order the output from slowest to fastest
+      @example_times = @example_times.sort_by(&:last).reverse
       @example_times.each do |file, time|
         relative_path = file.sub(%r{^#{Regexp.escape Dir.pwd}/}, '').sub(%r{^\./}, "")
         @output.puts "#{relative_path}:#{[time, 0].max}"

spec/parallel_tests/rspec/runtime_logger_spec.rb

@@ -120,13 +120,22 @@ def write(file, content)
         end
       RUBY
 
+      write "spec/slower_spec.rb", <<-RUBY
+        describe "xxx" do
+          it "is slow" do
+            sleep 3
+          end
+      end
+      RUBY
+
       system(
         { 'TEST_ENV_NUMBER' => '1' },
         "rspec", "spec", "-I", Bundler.root.join("lib").to_s, "--format", "ParallelTests::RSpec::RuntimeLogger", "--out", "runtime.log"
       ) || raise("nope")
 
       result = File.read("runtime.log")
-      expect(result).to include "a_spec.rb:1.5"
+      expect(result).to start_with("spec/slower_spec.rb:3.0")
+      expect(result).to include "spec/a_spec.rb:1.5"
     end
   end
 end