Module: Cuprum::Collections::RSpec::Contracts::RelationContracts::ShouldDefineCardinalityContract

Extended by:
RSpec::SleepingKingStudios::Contract
Defined in:
lib/cuprum/collections/rspec/contracts/relation_contracts.rb

Overview

Contract validating a Relation’s cardinality properties.

Instance Method Summary collapse

Instance Method Details

#apply(example_group) ⇒ Object

Adds the contract to the example group.

Parameters:

  • example_group (RSpec::Core::ExampleGroup) —

    the example group to which the contract is applied.



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# File 'lib/cuprum/collections/rspec/contracts/relation_contracts.rb', line 1190

contract do
  describe '.new' do
    describe 'with plural: an Object' do
      let(:constructor_options) do
        super().merge(plural: Object.new.freeze)
      end
      let(:error_message) do
        'plural must be true or false'
      end

      it 'should raise an exception' do
        expect { described_class.new(**constructor_options) }
          .to raise_error ArgumentError, error_message
      end
    end

    describe 'with singular: an Object' do
      let(:constructor_options) do
        super().merge(singular: Object.new.freeze)
      end
      let(:error_message) do
        'singular must be true or false'
      end

      it 'should raise an exception' do
        expect { described_class.new(**constructor_options) }
          .to raise_error ArgumentError, error_message
      end
    end

    describe 'with singular: nil and plural: value' do
      let(:constructor_options) do
        super().merge(plural: true, singular: nil)
      end

      it 'should not raise an exception' do
        expect { described_class.new(**constructor_options) }
          .not_to raise_error
      end
    end

    describe 'with singular: value and plural: nil' do
      let(:constructor_options) do
        super().merge(plural: nil, singular: true)
      end

      it 'should not raise an exception' do
        expect { described_class.new(**constructor_options) }
          .not_to raise_error
      end
    end

    describe 'with singular: value and plural: value' do
      let(:constructor_options) do
        super().merge(singular: true, plural: false)
      end
      let(:error_message) do
        'ambiguous cardinality: initialized with parameters ' \
          'plural: false and singular: true'
      end

      it 'should raise an exception' do
        expect { described_class.new(**constructor_options) }
          .to raise_error ArgumentError, error_message
      end
    end
  end

  describe '#plural?' do
    include_examples 'should define predicate', :plural?, true

    context 'when initialized with plural: false' do
      let(:constructor_options) { super().merge(plural: false) }

      it { expect(subject.plural?).to be false }
    end

    context 'when initialized with plural: true' do
      let(:constructor_options) { super().merge(plural: true) }

      it { expect(subject.plural?).to be true }
    end

    context 'when initialized with singular: false' do
      let(:constructor_options) { super().merge(singular: false) }

      it { expect(subject.plural?).to be true }
    end

    context 'when initialized with singular: true' do
      let(:constructor_options) { super().merge(singular: true) }

      it { expect(subject.plural?).to be false }
    end
  end

  describe '#singular?' do
    include_examples 'should define predicate', :singular?, false

    context 'when initialized with plural: false' do
      let(:constructor_options) { super().merge(plural: false) }

      it { expect(subject.singular?).to be true }
    end

    context 'when initialized with plural: true' do
      let(:constructor_options) { super().merge(plural: true) }

      it { expect(subject.singular?).to be false }
    end

    context 'when initialized with singular: false' do
      let(:constructor_options) { super().merge(singular: false) }

      it { expect(subject.singular?).to be false }
    end

    context 'when initialized with singular: true' do
      let(:constructor_options) { super().merge(singular: true) }

      it { expect(subject.singular?).to be true }
    end
  end
end