test: use RbConfig.ruby for system calls

Author: zah

test/benchmarks/run_benchmarks.rb

@@ -5,6 +5,7 @@
 require 'fileutils'
 require 'benchmark'
 require 'optparse'
+require 'rbconfig'
 
 PROGRAMS_DIR = File.expand_path('programs', __dir__)
 FIXTURES_DIR = File.expand_path('fixtures', __dir__)
@@ -44,15 +45,15 @@ def run_benchmark(name)
   results = { name: name }
 
   elapsed = Benchmark.realtime do
-    system('ruby', program)
+    system(RbConfig.ruby, program)
     raise 'Program failed' unless $?.success?
   end
   results[:ruby_ms] = (elapsed * 1000).round
 
   native_dir = File.join(TMP_DIR, name, 'native')
   FileUtils.mkdir_p(native_dir)
   elapsed = Benchmark.realtime do
-    system('ruby', File.expand_path('../../gems/codetracer-ruby-recorder/lib/native_trace.rb', __dir__),
+    system(RbConfig.ruby, File.expand_path('../../gems/codetracer-ruby-recorder/lib/native_trace.rb', __dir__),
            '--out-dir', native_dir, program)
     raise 'Native trace failed' unless $?.success?
   end
@@ -63,7 +64,7 @@ def run_benchmark(name)
   pure_dir = File.join(TMP_DIR, name, 'pure')
   FileUtils.mkdir_p(pure_dir)
   elapsed = Benchmark.realtime do
-    system('ruby', File.expand_path('../../gems/codetracer-pure-ruby-recorder/lib/trace.rb', __dir__),
+    system(RbConfig.ruby, File.expand_path('../../gems/codetracer-pure-ruby-recorder/lib/trace.rb', __dir__),
            '--out-dir', pure_dir, program)
     raise 'Pure trace failed' unless $?.success?
   end

test/test_tracer.rb

@@ -2,6 +2,7 @@
 require 'json'
 require 'fileutils'
 require 'open3'
+require 'rbconfig'
 require 'tmpdir'
 
 class TraceTest < Minitest::Test
@@ -22,7 +23,7 @@ def run_trace(tracer_script, program_name, *args)
       program = File.join('test', 'programs', program_name)
       out_dir = File.join('test', 'tmp', base, tracer_name)
       FileUtils.mkdir_p(out_dir)
-      stdout, stderr, status = Open3.capture3('ruby', tracer_script, '--out-dir', out_dir, program, *args)
+      stdout, stderr, status = Open3.capture3(RbConfig.ruby, tracer_script, '--out-dir', out_dir, program, *args)
       raise "trace failed: #{stderr}" unless status.success?
       trace_file = File.join(out_dir, 'trace.json')
       trace = JSON.parse(File.read(trace_file)) if File.exist?(trace_file)
@@ -84,7 +85,7 @@ def run_gem_installation_test(gem_bin, gem_module)
 
         out_dir = File.join('test', 'tmp', "gem_install_#{gem_bin.tr('-', '_')}")
         FileUtils.rm_rf(out_dir)
-        stdout, stderr, status = Open3.capture3(env, 'ruby', '-S', gem_bin, '--out-dir', out_dir, File.join('test', 'programs', 'addition.rb'))
+        stdout, stderr, status = Open3.capture3(env, RbConfig.ruby, '-S', gem_bin, '--out-dir', out_dir, File.join('test', 'programs', 'addition.rb'))
         raise "#{gem_bin} failed: #{stderr}" unless status.success?
         assert_equal "3\n", stdout
         assert File.exist?(File.join(out_dir, 'trace.json'))
@@ -105,7 +106,7 @@ def run_gem_installation_test(gem_bin, gem_module)
         RUBY
         script_path = File.join('test', 'tmp', "use_#{gem_bin.tr('-', '_')}.rb")
         File.write(script_path, script)
-        stdout, stderr, status = Open3.capture3(env, 'ruby', script_path)
+        stdout, stderr, status = Open3.capture3(env, RbConfig.ruby, script_path)
         raise "#{gem_module} library failed: #{stderr}" unless status.success?
         expected_out = <<~OUT
           start trace
@@ -132,7 +133,7 @@ def test_pure_debug_smoke
       env = { 'CODETRACER_RUBY_RECORDER_DEBUG' => '1' }
       out_dir = File.join('test', 'tmp', 'debug_smoke')
       FileUtils.rm_rf(out_dir)
-      stdout, stderr, status = Open3.capture3(env, 'ruby', 'gems/codetracer-pure-ruby-recorder/lib/trace.rb', '--out-dir', out_dir, File.join('test', 'programs', 'addition.rb'))
+      stdout, stderr, status = Open3.capture3(env, RbConfig.ruby, 'gems/codetracer-pure-ruby-recorder/lib/trace.rb', '--out-dir', out_dir, File.join('test', 'programs', 'addition.rb'))
       raise "trace failed: #{stderr}" unless status.success?
 
       lines = stdout.lines.map(&:chomp)