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require 'spec_helper'
require 'r10k/instance_cache'
describe R10K::InstanceCache do
describe "setting up a new instance cache" do
let(:klass) do
dubs = double('test class')
allow(dubs).to receive(:new) { |*args| args }
dubs
end
it "can create new objects" do
registry = described_class.new(klass)
expect(registry.generate).to eq []
end
describe "defining object arity" do
it "handles unary objects" do
expect(klass).to receive(:new).with(:foo)
registry = described_class.new(klass)
expect(registry.generate(:foo)).to eq [:foo]
end
it "handles ternary objects" do
expect(klass).to receive(:new).with(:foo, :bar, :baz)
registry = described_class.new(klass)
expect(registry.generate(:foo, :bar, :baz)).to eq [:foo, :bar, :baz]
end
it 'handles n-ary objects' do
args = %w[a bunch of arbitrary objects]
expect(klass).to receive(:new).with(*args)
registry = described_class.new(klass)
expect(registry.generate(*args)).to eq args
end
it 'fails when the required arguments are not matched' do
expect(klass).to receive(:new).and_raise ArgumentError, "not enough args"
registry = described_class.new(klass)
expect { registry.generate('arity is hard') }.to raise_error ArgumentError, "not enough args"
end
end
it "can specify the constructor method" do
expect(klass).to receive(:from_json).and_return "this is json, right?"
registry = described_class.new(klass, :from_json)
expect(registry.generate).to eq "this is json, right?"
end
end
it "returns a memoized object if it's been created before" do
registry = described_class.new(String)
first = registry.generate "bam!"
second = registry.generate "bam!"
expect(first.object_id).to eq second.object_id
end
it 'can clear registered objects' do
registry = described_class.new(String)
first = registry.generate "bam!"
registry.clear!
second = registry.generate "bam!"
expect(first.object_id).to_not eq second.object_id
end
end
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