Add a new #filter alias for #select

* In Enumerable, Enumerator::Lazy, Array, Hash and Set
  [Feature #13784] [ruby-core:82285]
* Share specs for the various #select#select! methods and
  reuse them for #filter/#filter!.
* Add corresponding filter tests for select tests.
* Update NEWS.

[Fix GH-1824]

From: Alexander Patrick <adp90@case.edu>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62575 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 18 insertions, 0 deletions

diff --git a/test/test_set.rb b/test/test_set.rb
index 4c6730d141..b20920e63e 100644
--- a/test/test_set.rb
+++ b/test/test_set.rb
@@ -545,6 +545,24 @@ class TC_Set < Test::Unit::TestCase
     assert_equal(Set.new(1..10), set)
   end
 
+  def test_filter!
+    set = Set.new(1..10)
+    ret = set.filter! { |i| i <= 10 }
+    assert_equal(nil, ret)
+    assert_equal(Set.new(1..10), set)
+
+    set = Set.new(1..10)
+    ret = set.filter! { |i| i % 3 != 0 }
+    assert_same(set, ret)
+    assert_equal(Set[1,2,4,5,7,8,10], set)
+
+    set = Set.new(1..10)
+    enum = set.filter!
+    assert_equal(set.size, enum.size)
+    assert_equal(nil, enum.each { |i| i <= 10 })
+    assert_equal(Set.new(1..10), set)
+  end
+
   def test_merge
     set = Set[1,2,3]