Remove first_is_1 check

lib/parallel_tests/cli.rb

@@ -82,8 +82,7 @@ def run_tests_in_parallel(num_processes, options)
 
         report_number_of_tests(groups) unless options[:quiet]
         test_results = execute_in_parallel(groups, groups.size, options) do |group, index|
-          test_env_number = options[:first_is_1] ? index + 1 : index
-          run_tests(group, test_env_number, num_processes, options)
+          run_tests(group, index, num_processes, options)
         end
         report_results(test_results, options) unless options[:quiet]
       end

spec/parallel_tests/cli_spec.rb

@@ -394,9 +394,9 @@ def self.it_prints_nothing_about_rerun_commands(options)
 
       it "calls run_tests with --first-is-1" do
         options = common_options.merge(count: processes, first_is_1: true)
+        expect(subject).to receive(:run_tests).once.with(['foo'], 0, processes, options).and_return(results)
         expect(subject).to receive(:run_tests).once.with(['foo'], 1, processes, options).and_return(results)
-        expect(subject).to receive(:run_tests).once.with(['foo'], 2, processes, options).and_return(results)
-        expect(subject).to receive(:run_tests).once.with(['bar'], 3, processes, options).and_return(results)
+        expect(subject).to receive(:run_tests).once.with(['bar'], 2, processes, options).and_return(results)
         subject.run(['test', '-n', processes.to_s, '--first-is-1', '--allow-duplicates', '-t', 'my_test_runner'])
       end
     end