https://git.ruby-lang.org/ruby.git/commit/?id=12de92a368

From 12de92a3682f7a54941c511e6394068df2adefb3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Thu, 12 Dec 2019 11:11:39 +0900
Subject: implement make test-all TESTS=--gc-compact

79eb5e1acac2339c6ec71db723298bdfcd92b233 implemented
RUBY_TEST_GC_COMPACT=1 so why not make it also possible via the command
line argument.

diff --git a/tool/lib/test/unit.rb b/tool/lib/test/unit.rb
index 928c896..42d1d83 100644
--- a/tool/lib/test/unit.rb
+++ b/tool/lib/test/unit.rb
@@ -922,13 +922,16 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit.rb#L922
       end
     end
 
-    module GCStressOption # :nodoc: all
+    module GCOption # :nodoc: all
       def setup_options(parser, options)
         super
         parser.separator "GC options:"
         parser.on '--[no-]gc-stress', 'Set GC.stress as true' do |flag|
           options[:gc_stress] = flag
         end
+        parser.on '--[no-]gc-compact', 'GC.compact every time' do |flag|
+          options[:gc_compact] = flag
+        end
       end
 
       def non_options(files, options)
@@ -945,6 +948,18 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit.rb#L948
             end
           end
         end
+        if options.delete(:gc_compact)
+          MiniTest::Unit::TestCase.class_eval do
+            oldrun = instance_method(:run)
+            define_method(:run) do |runner|
+              begin
+                oldrun.bind_call(self, runner)
+              ensure
+                GC.compact
+              end
+            end
+          end
+        end
         super
       end
     end
@@ -1080,7 +1095,7 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit.rb#L1095
       include Test::Unit::GlobOption
       include Test::Unit::RepeatOption
       include Test::Unit::LoadPathOption
-      include Test::Unit::GCStressOption
+      include Test::Unit::GCOption
       include Test::Unit::ExcludesOption
       include Test::Unit::TimeoutOption
       include Test::Unit::RunCount
-- 
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