require 'support/filesystem_helpers'

module Uh
  module WM
    RSpec.describe RunControl do
      include FileSystemHelpers

      let(:code)    { :run_control_code }
      let(:env)     { Env.new(StringIO.new) }
      subject(:rc)  { described_class.new env }

      describe '.evaluate' do
        around do |example|
          with_file ':run_control_code' do |f|
            env.rc_path = f.path
            example.run
          end
        end

        it 'builds a new instance with given env' do
          expect(described_class).to receive(:new).with(env).and_call_original
          described_class.evaluate env
        end

        it 'tells the new instance to evaluate run control file content' do
          expect(rc).to receive(:evaluate).with ':run_control_code'
          allow(described_class).to receive(:new) { rc }
          described_class.evaluate env
        end

        context 'when run control file is not present' do
          before { env.rc_path = 'non_existent_rc_file.rb' }

          it 'does not raise any error' do
            expect { described_class.evaluate env }.not_to raise_error
          end
        end
      end

      describe '#evaluate' do
        it 'evaluates given code' do
          expect { rc.evaluate 'throw :run_control_code' }
            .to throw_symbol :run_control_code
        end

        it 'provides access to assigned env' do
          expect { rc.evaluate 'fail @env.object_id.to_s' }
            .to raise_error env.object_id.to_s
        end
      end
    end
  end
end