From 1cb9f27c13481594469948ddbca982dd5ae4fad8 Mon Sep 17 00:00:00 2001 From: marcandre Date: Tue, 6 Nov 2012 17:11:06 +0000 Subject: * array.c (rb_ary_permutation): Support for Array#permutation.size [Feature #6636] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37501 b2dd03c8-39d4-4d8f-98ff-823fe69b080e --- test/ruby/test_enumerator.rb | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'test/ruby/test_enumerator.rb') diff --git a/test/ruby/test_enumerator.rb b/test/ruby/test_enumerator.rb index c276455a01..a4222f2ac0 100644 --- a/test/ruby/test_enumerator.rb +++ b/test/ruby/test_enumerator.rb @@ -429,5 +429,18 @@ class TestEnumerator < Test::Unit::TestCase end end + def check_consistency_for_combinatorics(method) + [ [], [:a, :b, :c, :d, :e] ].product([-2, 0, 2, 5, 6]) do |array, arg| + assert_equal array.send(method, arg).to_a.size, array.send(method, arg).size, + "inconsistent size for #{array}.#{method}(#{arg})" + end + end + + def test_size_for_array_combinatorics + check_consistency_for_combinatorics(:permutation) + assert_equal 24, [0, 1, 2, 4].permutation.size + assert_equal 2933197128679486453788761052665610240000000, + (1..42).to_a.permutation(30).size # 1.upto(42).inject(:*) / 1.upto(12).inject(:*) + end end -- cgit v1.2.3