Sha256: 8ec09ac06b213ec2ecc7f80428ac58db19f0aea9698dec442ba6e58dba9f7515
Contents?: true
Size: 951 Bytes
Versions: 83
Compression:
Stored size: 951 Bytes
Contents
require File.dirname(File.join(__rhoGetCurrentDir(), __FILE__)) + '/../../spec_helper'
describe "Array#combination" do
ruby_version_is "1.8.7" do
it "returns an enumerator when no block is provided" do
[1, 2, 3, 4].combination(2).should be_kind_of(enumerator_class)
end
it "returns self when a block is given" do
a = [1, 2, 3, 4]
a.combination(2){}.should equal(a)
end
it "yields nothing for out of bounds length and return self" do
a = [1, 2, 3, 4]
a.combination(5).to_a.should == []
a.combination(-1).to_a.should == []
end
it "yields the excepted combinations" do
a = [1, 2, 3, 4]
a.combination(3).to_a.sort.should == [[1,2,3],[1,2,4],[1,3,4],[2,3,4]]
end
if "yields [] when length is 0"
[1,2,3].combination(0).to_a.should == [[]] # one combination of length 0
[].combination(0).to_a.should == [[]] # one combination of length 0
end
end
end
Version data entries
83 entries across 83 versions & 1 rubygems