Sha256: e2cee0079b38d070cae6bdefe13aad53affd4cf6cc76abf0e59b454d81997a3a
Contents?: true
Size: 837 Bytes
Versions: 3
Compression:
Stored size: 837 Bytes
Contents
require "spec_helper"
require "hamster/hash"
describe Hamster::Hash do
describe "#invert" do
let(:hash) { H[a: 3, b: 2, c: 1] }
it "uses the existing keys as values and values as keys" do
hash.invert.should eql(H[3 => :a, 2 => :b, 1 => :c])
end
it "will select one key/value pair among multiple which have same value" do
[H[1 => :a],
H[1 => :b],
H[1 => :c]].include?(H[a: 1, b: 1, c: 1].invert).should == true
end
it "doesn't change the original Hash" do
hash.invert
hash.should eql(H[a: 3, b: 2, c: 1])
end
context "from a subclass of Hash" do
it "returns an instance of the subclass" do
subclass = Class.new(Hamster::Hash)
instance = subclass.new(a: 1, b: 2)
instance.invert.class.should be(subclass)
end
end
end
end
Version data entries
3 entries across 3 versions & 2 rubygems