free_mutant/spec/unit/mutant/mutation_spec.rb

RSpec.describe Mutant::Mutation do

  class TestMutation < Mutant::Mutation
    SYMBOL = 'test'.freeze
  end

  let(:object)  { TestMutation.new(mutation_subject, Mutant::AST::Nodes::N_NIL) }
  let(:context) { double('Context')                                             }

  let(:mutation_subject) do
    double(
      'Subject',
      identification: 'subject',
      context: context,
      source: 'original',
      tests:  tests
    )
  end

  let(:test_a) { double('Test A') }
  let(:test_b) { double('Test B') }
  let(:tests)  { [test_a, test_b] }

  describe '#code' do
    subject { object.code }

    it { should eql('8771a') }

    it_should_behave_like 'an idempotent method'
  end

  describe '#original_source' do
    subject { object.original_source }

    it { should eql('original') }

    it_should_behave_like 'an idempotent method'
  end

  describe '#source' do
    subject { object.source }

    it { should eql('nil') }

    it_should_behave_like 'an idempotent method'
  end

  describe '#identification' do

    subject { object.identification }

    it { should eql('test:subject:8771a') }

    it_should_behave_like 'an idempotent method'
  end
end