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require 'spec_helper'
describe Virtus::AttributeSet, '#merge' do
subject { object.merge(other) }
let(:parent) { described_class.new }
let(:object) { described_class.new(parent, attributes) }
let(:name) { :name }
let(:other) { [attribute] }
context 'with a new attribute' do
let(:attributes) { [] }
let(:attribute) { Virtus::Attribute.build(String, :name => name) }
it { is_expected.to equal(object) }
it 'adds an attribute' do
expect { subject }.to change { object.to_a }.from(attributes).to([attribute])
end
end
context 'with a duplicate attribute' do
let(:attributes) { [Virtus::Attribute.build(String, :name => name)] }
let(:attribute) { Virtus::Attribute.build(String, :name => name) }
it { is_expected.to equal(object) }
it "replaces the original attribute object" do
expect { subject }.to change { object.to_a.map(&:__id__) }.
from(attributes.map(&:__id__)).
to([attribute.__id__])
end
end
end
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