all?, any?, one?, none? of empty Enumerable

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51142 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: nobu

test/ruby/test_enum.rb

@@ -238,13 +238,17 @@ def test_all
     assert_equal(false, @obj.all? {|x| x < 3 })
     assert_equal(true, @obj.all?)
     assert_equal(false, [true, true, false].all?)
+    assert_equal(true, [].all?)
+    assert_equal(true, @empty.all?)
   end
 
   def test_any
     assert_equal(true, @obj.any? {|x| x >= 3 })
     assert_equal(false, @obj.any? {|x| x > 3 })
     assert_equal(true, @obj.any?)
     assert_equal(false, [false, false, false].any?)
+    assert_equal(false, [].any?)
+    assert_equal(false, @empty.any?)
   end
 
   def test_one
@@ -256,6 +260,8 @@ def test_one
     assert(!(%w{ant bear cat}.one? {|word| word.length < 4}))
     assert(!([ nil, true, 99 ].one?))
     assert([ nil, true, false ].one?)
+    assert(![].one?)
+    assert(!@empty.one?)
   end
 
   def test_none
@@ -268,6 +274,7 @@ def test_none
     assert([nil].none?)
     assert([nil,false].none?)
     assert(![nil,false,true].none?)
+    assert(@empty.none?)
   end
 
   def test_min