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require "spec_helper"
require "hamster/immutable"
describe Hamster::Immutable do
class Fixture
include Hamster::Immutable
def initialize(&block)
@block = block
end
def call
@block.call
end
memoize :call
def copy
transform {}
end
end
let(:immutable) { Fixture.new { @count += 1 } }
describe "#memoize" do
before(:each) do
@count = 0
immutable.call
end
it "keeps the receiver frozen and immutable" do
expect(immutable).to be_immutable
end
context "when called multiple times" do
before(:each) do
immutable.call
end
it "doesn't evaluate the memoized method more than once" do
expect(@count).to eq(1)
end
end
describe "when making a copy" do
let(:copy) { immutable.copy }
before(:each) do
copy.call
end
it "clears all memory" do
expect(@count).to eq(2)
end
end
end
end
|
