https://git.ruby-lang.org/ruby.git/commit/?id=cb55024613

From cb550246136b90a63b4f75f5e7cfaccb9da08eda Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Sun, 28 Apr 2019 23:23:00 +0900
Subject: test/ruby/test_integer.rb: Add a sane test for Integer#[]


diff --git a/test/ruby/test_integer.rb b/test/ruby/test_integer.rb
index 69347b6..ad088aa 100644
--- a/test/ruby/test_integer.rb
+++ b/test/ruby/test_integer.rb
@@ -10,7 +10,21 @@ class TestInteger < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_integer.rb#L10
     self.class.bdsize(x)
   end
 
+  FIXNUM_MIN = RbConfig::LIMITS['FIXNUM_MIN']
+  FIXNUM_MAX = RbConfig::LIMITS['FIXNUM_MAX']
+
   def test_aref
+
+    [
+      *-16..16,
+      *(FIXNUM_MIN-2)..(FIXNUM_MIN+2),
+      *(FIXNUM_MAX-2)..(FIXNUM_MAX+2),
+    ].each do |n|
+      (-64..64).each do |idx|
+        assert_equal((n >> idx) & 1, n[idx])
+      end
+    end
+
     # assert_equal(1, (1 << 0x40000000)[0x40000000], "[ruby-dev:31271]")
     # assert_equal(0, (-1 << 0x40000001)[0x40000000], "[ruby-dev:31271]")
     big_zero = 0x40000000.coerce(0)[0]
-- 
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