Add `Set#reset`

This method resets the internal state of a set after modification to
existing elements, reindexing and deduplicating them. [Feature #6589]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60360 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 13 insertions, 0 deletions

diff --git a/test/test_set.rb b/test/test_set.rb
index 33802410af..37b781c5ca 100644
--- a/test/test_set.rb
+++ b/test/test_set.rb
@@ -761,6 +761,19 @@ class TC_Set < Test::Unit::TestCase
     assert_equal(3, set.size)
     assert_equal(array.uniq.sort, set.sort)
   end
+
+  def test_reset
+    [Set, Class.new(Set)].each { |klass|
+      a = [1, 2]
+      b = [1]
+      set = klass.new([a, b])
+
+      b << 2
+      set.reset
+
+      assert_equal(klass.new([a]), set, klass.name)
+    }
+  end
 end
 
 class TC_SortedSet < Test::Unit::TestCase