Allow passing custom command lines as "PARALLEL_TESTS_EXECUTABLE" (#972)

* Restore support for passing custom command lines as PARALLEL_TESTS_EXECUTABLE.

* Fix RuboCop failures introduced recently

CHANGELOG.md

@@ -8,6 +8,8 @@
 
 ### Fixed
 
+- Restore support for passing custom command lines as PARALLEL_TESTS_EXECUTABLE.
+
 ## 4.7.1 - 2024-04-25
 
 ### Added

lib/parallel_tests/test/runner.rb

@@ -158,7 +158,7 @@ def command_with_seed(cmd, seed)
 
         def executable
           if (executable = ENV['PARALLEL_TESTS_EXECUTABLE'])
-            [executable]
+            Shellwords.shellsplit(executable)
           else
             determine_executable
           end

parallel_tests.gemspec

@@ -15,8 +15,6 @@ Gem::Specification.new name, ParallelTests::VERSION do |s|
     "wiki_uri" => "https://github.com/grosser/#{name}/wiki"
   }
 
-
-
   s.files = Dir["{lib,bin}/**/*"] + ["Readme.md"]
   s.license = "MIT"
   s.executables = ["parallel_spinach", "parallel_cucumber", "parallel_rspec", "parallel_test"]

spec/parallel_tests/test/runner_spec.rb

@@ -18,6 +18,12 @@ def call(*args)
         expect(a).to include("script/custom_rspec")
       end
       call(['xxx'], 1, 22, {})
+
+      ENV['PARALLEL_TESTS_EXECUTABLE'] = 'ruby -Icustom_option script/custom_rspec'
+      expect(ParallelTests::Test::Runner).to receive(:execute_command) do |a, _, _, _d|
+        expect(a).to include("ruby", "-Icustom_option", "script/custom_rspec")
+      end
+      call(['xxx'], 1, 22, {})
     end
 
     it "uses options" do