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An example showing how to use factory_girl without polluting the global scope.
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require 'factory_girl' | |
class Simulator | |
def initialize(model, options={}, &block) | |
self.model = model | |
self.strategy = options.fetch(:strategy) { FactoryGirl::Strategy::Build } | |
self.factory = define(&block) | |
end | |
def build(overrides={}, &block) | |
factory.run(strategy, overrides, &block) | |
end | |
private | |
attr_accessor :model | |
attr_accessor :strategy | |
attr_accessor :factory | |
def define(&block) | |
FactoryGirl::Factory.new(model).tap do |factory| | |
proxy = FactoryGirl::DefinitionProxy.new(factory.definition) | |
proxy.instance_eval &block | |
end | |
end | |
end |
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require 'simulator' | |
require 'virtus' | |
describe Simulator do | |
let(:model) { | |
Class.new do | |
include Virtus.model | |
attribute :value, Integer | |
end | |
} | |
let(:simulator) { | |
Simulator.new(model) do | |
value { 42 } | |
end | |
} | |
describe '#build' do | |
it 'returns an instance of the model' do | |
expect(simulator.build).to be_a model | |
end | |
it 'uses the factory definition' do | |
instance = simulator.build | |
expect(instance.value).to eq 42 | |
end | |
it 'allow values to be overridden' do | |
instance = simulator.build(value: 37) | |
expect(instance.value).to eq 37 | |
end | |
it 'yields the model' do | |
expect { |block| simulator.build({}, &block) } | |
.to yield_with_args an_instance_of(model) | |
end | |
end | |
end |
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