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require "spec_helper"
require "hamster/hash"
describe Hamster::Hash do
[:map, :collect].each do |method|
describe "##{method}" do
context "when empty" do
it "returns self" do
H.empty.send(method) {}.should equal(H.empty)
end
end
context "when not empty" do
let(:hash) { H["A" => "aye", "B" => "bee", "C" => "see"] }
context "with a block" do
let(:mapped) { hash.send(method) { |key, value| [key.downcase, value.upcase] }}
it "preserves the original values" do
mapped
hash.should eql(H["A" => "aye", "B" => "bee", "C" => "see"])
end
it "returns a new hash with the mapped values" do
mapped.should eql(H["a" => "AYE", "b" => "BEE", "c" => "SEE"])
end
end
context "with no block" do
it "returns an Enumerator" do
hash.send(method).class.should be(Enumerator)
hash.send(method).each { |k,v| [k.downcase, v] }.should == hash.map { |k,v| [k.downcase, v] }
end
end
end
context "from a subclass" do
it "returns an instance of the subclass" do
subclass = Class.new(Hamster::Hash)
instance = subclass.new('a' => 'aye', 'b' => 'bee')
instance.map { |k,v| [k, v.upcase] }.class.should be(subclass)
end
end
end
end
end
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