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require 'spec_helper'
describe InternalId do
let(:project) { create(:project) }
let(:usage) { :issues }
let(:issue) { build(:issue, project: project) }
let(:scope) { { project: project } }
let(:init) { ->(s) { s.project.issues.size } }
context 'validations' do
it { is_expected.to validate_presence_of(:usage) }
end
describe '.generate_next' do
subject { described_class.generate_next(issue, scope, usage, init) }
context 'in the absence of a record' do
it 'creates a record if not yet present' do
expect { subject }.to change { described_class.count }.from(0).to(1)
end
it 'stores record attributes' do
subject
described_class.first.tap do |record|
expect(record.project).to eq(project)
expect(record.usage).to eq(usage.to_s)
end
end
context 'with existing issues' do
before do
rand(1..10).times { create(:issue, project: project) }
described_class.delete_all
end
it 'calculates last_value values automatically' do
expect(subject).to eq(project.issues.size + 1)
end
end
context 'with concurrent inserts on table' do
it 'looks up the record if it was created concurrently' do
args = { **scope, usage: described_class.usages[usage.to_s] }
record = double
expect(described_class).to receive(:find_by).with(args).and_return(nil) # first call, record not present
expect(described_class).to receive(:find_by).with(args).and_return(record) # second call, record was created by another process
expect(described_class).to receive(:create!).and_raise(ActiveRecord::RecordNotUnique, 'record not unique')
expect(record).to receive(:increment_and_save!)
subject
end
end
end
it 'generates a strictly monotone, gapless sequence' do
seq = (0..rand(100)).map do
described_class.generate_next(issue, scope, usage, init)
end
normalized = seq.map { |i| i - seq.min }
expect(normalized).to eq((0..seq.size - 1).to_a)
end
context 'with an insufficient schema version' do
before do
described_class.reset_column_information
expect(ActiveRecord::Migrator).to receive(:current_version).and_return(InternalId::REQUIRED_SCHEMA_VERSION - 1)
end
let(:init) { double('block') }
it 'calculates next internal ids on the fly' do
val = rand(1..100)
expect(init).to receive(:call).with(issue).and_return(val)
expect(subject).to eq(val + 1)
end
end
end
describe '#increment_and_save!' do
let(:id) { create(:internal_id) }
subject { id.increment_and_save! }
it 'returns incremented iid' do
value = id.last_value
expect(subject).to eq(value + 1)
end
it 'saves the record' do
subject
expect(id.changed?).to be_falsey
end
context 'with last_value=nil' do
let(:id) { build(:internal_id, last_value: nil) }
it 'returns 1' do
expect(subject).to eq(1)
end
end
end
end
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