update spec for ubuntu-latest; no need of log file with newer aruba

Rakefile

@@ -169,14 +169,7 @@ task :test =>
   end
 
   # run rspec
-  begin
-    sh "bundle exec rspec" + opt_args + opt_files
-  rescue
-    # show outputs if failed
-    log_file = TMP_DIR / "rspec.log"
-    sh "cat #{log_file}", verbose: false
-    fail
-  end
+  sh "bundle exec rspec" + opt_args + opt_files
 
   # make sure to end this process
   exit 0

spec/config/environment_variables_spec.rb

@@ -175,8 +175,9 @@ def ignore_env_line(config, env)
   if OS.windows?
     # TODO: support locale on Windows
   else
-    context "LC_ALL" do
+    context "LC_ALL and LANG" do
       before(:each) { set_environment_variable "LC_ALL", "ja_JP.UTF-8" }
+      before(:each) { set_environment_variable "LANG", "ja_JP.UTF-8" }
       before(:each) { run_texdoc "-dconfig", "texlive-en" }
 
       it "should be effective" do

spec/support/helpers/texdoc.rb

@@ -50,27 +50,4 @@ def set_default_env
 RSpec.configure do |config|
   config.include SpecHelplers::Texdoc
   config.before(:each) { set_default_env }
-
-  # log
-  log_file = Pathname.pwd + "tmp/rspec.log"
-
-  config.before(:suite) do
-    now = Time.now.strftime("%F %T")
-    File.open(log_file, "w") do |log|
-      log.puts("Outputs of failed commands (#{now})")
-    end
-  end
-
-  config.after(:each) do |example|
-    if !example.exception.nil?
-      File.open(log_file, "a") do |log|
-        log.puts
-        log.puts last_command_started.commandline
-        log.puts "STDOUT"
-        log.puts last_command_started.stdout
-        log.puts "STDERR"
-        log.puts last_command_started.stderr
-      end
-    end
-  end
 end