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require "spec_helper"
require "hamster/immutable"
describe Hamster::Immutable do
class TransformPerson < Struct.new(:first, :last)
include Hamster::Immutable
public :transform
end
let(:immutable) { TransformPerson.new("Simon", "Harris") }
describe "#transform" do
let(:transform) { immutable.transform { self.first = "Sampy" } }
let(:original) { immutable.first }
let(:modified) { transform.first }
it "preserves the original" do
expect(original).to eq("Simon")
end
it "returns a new instance with the updated values" do
expect(modified).to eq("Sampy")
end
end
end
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