hash.c: compare methods

* hash.c (rb_hash_{le,lt,ge,gt}): new methods, Hash#<=, Hash#<,
  Hash#>=, Hash#>, to test if all elements of a hash are also
  included in another hash, and vice versa.
  [ruby-core:68561] [Feature #10984]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52518 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 25 insertions, 0 deletions

diff --git a/test/ruby/test_hash.rb b/test/ruby/test_hash.rb
index ee51c8ed7d..4f48d3b90c 100644
--- a/test/ruby/test_hash.rb
+++ b/test/ruby/test_hash.rb
@@ -1308,6 +1308,31 @@ class TestHash < Test::Unit::TestCase
     assert_nil(h.dig(:c, 1))
   end
 
+  def test_cmp
+    h1 = {a:1, b:2}
+    h2 = {a:1, b:2, c:3}
+
+    assert_operator(h1, :<=, h1)
+    assert_operator(h1, :<=, h2)
+    assert_not_operator(h2, :<=, h1)
+    assert_operator(h2, :<=, h2)
+
+    assert_operator(h1, :>=, h1)
+    assert_not_operator(h1, :>=, h2)
+    assert_operator(h2, :>=, h1)
+    assert_operator(h2, :>=, h2)
+
+    assert_not_operator(h1, :<, h1)
+    assert_operator(h1, :<, h2)
+    assert_not_operator(h2, :<, h1)
+    assert_not_operator(h2, :<, h2)
+
+    assert_not_operator(h1, :>, h1)
+    assert_not_operator(h1, :>, h2)
+    assert_operator(h2, :>, h1)
+    assert_not_operator(h2, :>, h2)
+  end
+
   class TestSubHash < TestHash
     class SubHash < Hash
       def reject(*)