RSpec.describe Mutest::Parallel::Driver do let(:object) { described_class.new(binding) } let(:binding) { instance_double(Mutest::Actor::Binding) } let(:value) { instance_double(Object, 'value') } describe '#stop' do subject { object.stop } before do expect(binding).to receive(:call).with(:stop) end it_behaves_like 'a command method' end describe '#status' do subject { object.status } before do expect(binding).to receive(:call).with(:status).and_return(value) end it { is_expected.to be(value) } end end