From 86deb270953f9c5b62813d3e1938f33cc807bd7f Mon Sep 17 00:00:00 2001 From: Jeremy Kemper Date: Sun, 17 Dec 2006 00:49:41 +0000 Subject: Hash#slice(*keys) returns a new hash with only the given keys. #slice! replaces the hash with only the given keys. Works with HashWithIndifferentAccess also. git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5726 5ecf4fe2-1ee6-0310-87b1-e25e094e27de --- activesupport/test/core_ext/hash_ext_test.rb | 29 ++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'activesupport/test/core_ext') diff --git a/activesupport/test/core_ext/hash_ext_test.rb b/activesupport/test/core_ext/hash_ext_test.rb index 8e20f15518..90468fd5a9 100644 --- a/activesupport/test/core_ext/hash_ext_test.rb +++ b/activesupport/test/core_ext/hash_ext_test.rb @@ -243,6 +243,35 @@ class HashExtTest < Test::Unit::TestCase def test_diff assert_equal({ :a => 2 }, { :a => 2, :b => 5 }.diff({ :a => 1, :b => 5 })) end + + def test_slice + original = { :a => 'x', :b => 'y', :c => 10 } + expected = { :a => 'x', :b => 'y' } + + # Should return a new hash with only the given keys. + assert_equal expected, original.slice(:a, :b) + assert_not_equal expected, original + + # Should replace the hash with only the given keys. + assert_equal expected, original.slice!(:a, :b) + assert_equal expected, original + end + + def test_indifferent_slice + original = { :a => 'x', :b => 'y', :c => 10 }.with_indifferent_access + expected = { :a => 'x', :b => 'y' }.with_indifferent_access + + [['a', 'b'], [:a, :b]].each do |keys| + # Should return a new hash with only the given keys. + assert_equal expected, original.slice(*keys), keys.inspect + assert_not_equal expected, original + + # Should replace the hash with only the given keys. + copy = original.dup + assert_equal expected, copy.slice!(*keys) + assert_equal expected, copy + end + end end class IWriteMyOwnXML -- cgit v1.2.3