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require 'spec_helper'
shared_examples_for 'AtomicInternalId' do |validate_presence: true|
describe '.has_internal_id' do
describe 'Module inclusion' do
subject { described_class }
it { is_expected.to include_module(AtomicInternalId) }
end
describe 'Validation' do
before do
allow_any_instance_of(described_class).to receive(:"ensure_#{scope}_#{internal_id_attribute}!")
instance.valid?
end
context 'when presence validation is required' do
before do
skip unless validate_presence
end
it 'validates presence' do
expect(instance.errors[internal_id_attribute]).to include("can't be blank")
end
end
context 'when presence validation is not required' do
before do
skip if validate_presence
end
it 'does not validate presence' do
expect(instance.errors[internal_id_attribute]).to be_empty
end
end
end
describe 'Creating an instance' do
subject { instance.save! }
it 'saves a new instance properly' do
expect { subject }.not_to raise_error
end
end
describe 'internal id generation' do
subject { instance.save! }
it 'calls InternalId.generate_next and sets internal id attribute' do
iid = rand(1..1000)
expect(InternalId).to receive(:generate_next).with(instance, scope_attrs, usage, any_args).and_return(iid)
subject
expect(read_internal_id).to eq(iid)
end
it 'does not overwrite an existing internal id' do
write_internal_id(4711)
expect { subject }.not_to change { read_internal_id }
end
context 'when the instance has an internal ID set' do
let(:internal_id) { 9001 }
it 'calls InternalId.update_last_value and sets the `last_value` to that of the instance' do
write_internal_id(internal_id)
expect(InternalId)
.to receive(:track_greatest)
.with(instance, scope_attrs, usage, internal_id, any_args)
.and_return(internal_id)
subject
end
end
end
describe "#reset_scope_internal_id_attribute" do
it 'rewinds the allocated IID' do
expect { ensure_scope_attribute! }.not_to raise_error
expect(read_internal_id).not_to be_nil
expect(reset_scope_attribute).to be_nil
expect(read_internal_id).to be_nil
end
it 'allocates the same IID' do
internal_id = ensure_scope_attribute!
reset_scope_attribute
expect(read_internal_id).to be_nil
expect(ensure_scope_attribute!).to eq(internal_id)
end
end
def ensure_scope_attribute!
instance.public_send(:"ensure_#{scope}_#{internal_id_attribute}!")
end
def reset_scope_attribute
instance.public_send(:"reset_#{scope}_#{internal_id_attribute}")
end
def read_internal_id
instance.public_send(internal_id_attribute)
end
def write_internal_id(value)
instance.public_send(:"#{internal_id_attribute}=", value)
end
end
end
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