report_activity_spec.rb

require 'spec_helper'

require 'timebacus/use_cases/report_activity'

describe Timebacus::ReportActivity do
  context 'with valid data' do
    let(:activity) { mock(id: 5, duration: 1800, description: 'remote work') }
    mock_const Timebacus::ReportActivity, 'Activity' do |activity_class|
      activity_class.stub(new: activity)
    end
    mock_const Timebacus::ReportActivity, 'ActivityRepository' do |repository_class|
      repository_class.stub(store: activity)
    end
    subject { Timebacus::ReportActivity.new 1800, 'remote work' }

    it 'returns id of new activity' do
      subject.execute.should eq(5)
    end

    it 'stores activity to repository' do
      ActivityRepository.should_receive(:store).
        with(activity)
      subject.execute
    end
  end
end

spec_helper.rb

  module MockConst
    def mock_const(scope, const, &block)
      before do
        const_val = mock
        instance_exec(const_val, &block)
        scope.send(:const_set, const, const_val)
        self.class.const_set(const, const_val)
      end
      after do
        scope.send(:remove_const, const)
        self.class.send(:remove_const, const)
      end
    end
  end