Fix tests and add rake task

ruby/Gemfile

@@ -1,5 +1,7 @@
 source 'https://rubygems.org'
 ruby '3.1.0'
 
+gem 'minitest', '~> 5.15'
+gem 'rake', '~> 13.0'
 gem 'rubocop', '1.24.1'
 gem 'wordexp', '~> 0.1'

ruby/Gemfile.lock

@@ -2,10 +2,12 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
+    minitest (5.15.0)
     parallel (1.21.0)
     parser (3.1.0.0)
       ast (~> 2.4.1)
     rainbow (3.1.1)
+    rake (13.0.6)
     regexp_parser (2.2.0)
     rexml (3.2.5)
     rubocop (1.24.1)
@@ -27,6 +29,8 @@ PLATFORMS
   arm64-darwin-21
 
 DEPENDENCIES
+  minitest (~> 5.15)
+  rake (~> 13.0)
   rubocop (= 1.24.1)
   wordexp (~> 0.1)
 

ruby/Rakefile

@@ -0,0 +1,7 @@
+require 'rake/testtask'
+
+task default: 'test'
+
+Rake::TestTask.new do |task|
+  task.pattern = 'test/*_test.rb'
+end

ruby/test/shell_test.rb

@@ -1,10 +1,10 @@
-#!/usr/bin/env ruby -w
-
 require 'minitest/autorun'
 
 class ShellTest < Minitest::Test
   TRIVIAL_SHELL_SCRIPT = "#!/bin/sh\ntrue".freeze
 
+  A1_PATH = './a1'.freeze
+
   def setup
     FileUtils.mkdir_p('test_bin')
   end
@@ -18,12 +18,12 @@ class ShellTest < Minitest::Test
   end
 
   def test_expands_environment_variables
-    assert_equal ENV['HOME'], `./a1 -c 'echo $HOME'`.chomp
-    assert system("./a1 -c 'echo $HOME' >/dev/null")
+    assert_equal ENV['HOME'], `#{A1_PATH} -c 'echo $HOME'`.chomp
+    assert system("#{A1_PATH} -c 'echo $HOME' >/dev/null")
   end
 
   def test_fails_on_unknown_variables
-    assert_equal false, system("./a1 -c 'echo $DEFINITELY_DOES_NOT_EXIST' 2>/dev/null")
+    assert_equal false, system("#{A1_PATH} -c 'echo $DEFINITELY_DOES_NOT_EXIST' 2>/dev/null")
   end
 
   #################################
@@ -31,36 +31,36 @@ class ShellTest < Minitest::Test
   #################################
 
   def test_background_job
-    output = `./a1 -c 'bg echo hello'`
+    output = `#{A1_PATH} -c 'bg echo hello'`
     assert output.match?(/\ABackground job 1 \(pid \d+\)\nhello\n\z/m), "'#{output}' is unexpected"
   end
 
   def test_resolves_executables_with_absolute_paths
-    assert_equal '/usr/bin/which', `./a1 -c '/usr/bin/which -a which'`.chomp
+    assert_equal '/usr/bin/which', `#{A1_PATH} -c '/usr/bin/which -a which'`.chomp
   end
 
   def test_resolves_executables_with_relative_paths
     File.write('test_bin/something', TRIVIAL_SHELL_SCRIPT)
     File.chmod(0o755, 'test_bin/something')
-    assert system('./a1 -c ./test_bin/something')
+    assert system("#{A1_PATH} -c ./test_bin/something")
   end
 
   def test_resolves_executables_in_absolute_paths
-    assert_equal '/usr/bin/which', `./a1 -c 'which -a which'`.chomp
+    assert_equal '/usr/bin/which', `#{A1_PATH} -c 'which -a which'`.chomp
   end
 
   def test_resolves_executables_in_relative_paths
     code = rand(1_000_000).to_s
     File.write('test_bin/definitely_executable', unique_shell_script(code))
     File.chmod(0o755, 'test_bin/definitely_executable')
-    actual = `PATH="./test_bin:$PATH" ./a1 -c definitely_executable`.chomp
+    actual = `PATH="./test_bin:$PATH" #{A1_PATH} -c definitely_executable`.chomp
     assert_equal code, actual
   end
 
   def test_does_not_resolve_non_executable_files_in_path
     File.write('test_bin/definitely_not_executable', TRIVIAL_SHELL_SCRIPT)
     File.chmod(0o644, 'test_bin/definitely_not_executable')
-    actual = system('PATH="./test_bin:$PATH" ./a1 -c definitely_not_executable 2>/dev/null')
+    actual = system("PATH=\"./test_bin:$PATH\" #{A1_PATH} -c definitely_not_executable 2>/dev/null")
     assert_equal false, actual
   end
 
@@ -89,9 +89,9 @@ class ShellTest < Minitest::Test
   end
 
   def test_builtin_pwd
-    assert_equal Dir.pwd, `./a1 -c pwd`.chomp
+    assert_equal Dir.pwd, `#{A1_PATH} -c pwd`.chomp
 
-    shell_path = File.expand_path('a1', __dir__)
+    shell_path = File.expand_path(A1_PATH, Dir.pwd)
     assert_equal '/usr/bin', `cd /usr/bin && '#{shell_path}' -c pwd`.chomp
   end
 end