Add test for Array#keep_if

* test/ruby/test_array.rb (test_keep_if): Add test for
  Array#keep_if separate from Array#select!  [Fix GH-1218]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53639 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 15 insertions, 1 deletions

diff --git a/test/ruby/test_array.rb b/test/ruby/test_array.rb
index b1fc473f86..436906ae32 100644
--- a/test/ruby/test_array.rb
+++ b/test/ruby/test_array.rb
@@ -2081,7 +2081,6 @@ class TestArray < Test::Unit::TestCase
   def test_select!
     a = @cls[ 1, 2, 3, 4, 5 ]
     assert_equal(nil, a.select! { true })
-    assert_equal(a, a.keep_if { true })
     assert_equal(@cls[1, 2, 3, 4, 5], a)
 
     a = @cls[ 1, 2, 3, 4, 5 ]
@@ -2103,6 +2102,21 @@ class TestArray < Test::Unit::TestCase
     assert_equal(@cls[7, 8, 9, 10], a, bug10722)
   end
 
+  # also select!
+  def test_keep_if
+    a = @cls[ 1, 2, 3, 4, 5 ]
+    assert_equal(a, a.keep_if { true })
+    assert_equal(@cls[1, 2, 3, 4, 5], a)
+
+    a = @cls[ 1, 2, 3, 4, 5 ]
+    assert_equal(a, a.keep_if { false })
+    assert_equal(@cls[], a)
+
+    a = @cls[ 1, 2, 3, 4, 5 ]
+    assert_equal(a, a.keep_if { |i| i > 3 })
+    assert_equal(@cls[4, 5], a)
+  end
+
   def test_delete2
     a = [0] * 1024 + [1] + [0] * 1024
     a.delete(0)