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describe QA::Runtime::Release do
context 'when release version has extension strategy' do
subject { described_class.new('VER') }
let(:strategy) { spy('VER::Strategy') }
before do
stub_const('QA::VER::Strategy', strategy)
end
describe '#has_strategy?' do
it 'return true' do
expect(subject.has_strategy?).to be true
end
end
describe '#strategy' do
it 'return the strategy constant' do
expect(subject.strategy).to eq QA::VER::Strategy
end
end
describe 'delegated class methods' do
before do
allow_any_instance_of(described_class)
.to receive(:has_strategy?).and_return(true)
allow_any_instance_of(described_class)
.to receive(:strategy).and_return(strategy)
end
it 'delegates all calls to strategy class' do
described_class.some_method(1, 2)
expect(strategy).to have_received(:some_method)
.with(1, 2)
end
end
end
context 'when release version does not have extension strategy' do
subject { described_class.new('NOVER') }
describe '#has_strategy?' do
it 'returns false' do
expect(subject.has_strategy?).to be false
end
end
describe '#strategy' do
it 'raises error' do
expect { subject.strategy }.to raise_error(NameError)
end
end
describe 'does not delegate class methods' do
before do
allow_any_instance_of(described_class)
.to receive(:has_strategy?).and_return(false)
end
it 'behaves like a null object and does nothing' do
expect { described_class.some_method(2, 3) }.not_to raise_error
end
it 'returns nil' do
expect(described_class.something).to be_nil
end
it 'does not delegate to strategy object' do
expect_any_instance_of(described_class)
.not_to receive(:strategy)
end
end
end
end
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