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# frozen_string_literal: true
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 } }
it_behaves_like 'having unique enum values'
context 'validations' do
it { is_expected.to validate_presence_of(:usage) }
end
describe '.flush_records!' do
subject { described_class.flush_records!(project: project) }
let(:another_project) { create(:project) }
before do
create_list(:issue, 2, project: project)
create_list(:issue, 2, project: another_project)
end
it 'deletes all records for the given project' do
expect { subject }.to change { described_class.where(project: project).count }.from(1).to(0)
end
it 'retains records for other projects' do
expect { subject }.not_to change { described_class.where(project: another_project).count }
end
it 'does not allow an empty filter' do
expect { described_class.flush_records!({}) }.to raise_error(/filter cannot be empty/)
end
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
create_list(:issue, 2, 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 = Array.new(10).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
end
describe '.reset' do
subject { described_class.reset(issue, scope, usage, value) }
context 'in the absence of a record' do
let(:value) { 2 }
it 'does not revert back the value' do
expect { subject }.not_to change { described_class.count }
expect(subject).to be_falsey
end
end
context 'when valid iid is used to reset' do
let!(:value) { generate_next }
context 'and iid is a latest one' do
it 'does rewind and next generated value is the same' do
expect(subject).to be_truthy
expect(generate_next).to eq(value)
end
end
context 'and iid is not a latest one' do
it 'does not rewind' do
generate_next
expect(subject).to be_falsey
expect(generate_next).to be > value
end
end
def generate_next
described_class.generate_next(issue, scope, usage, init)
end
end
end
describe '.track_greatest' do
let(:value) { 9001 }
subject { described_class.track_greatest(issue, scope, usage, value, 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
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)
expect(record.last_value).to eq(value)
end
end
context 'with existing issues' do
before do
create(:issue, project: project)
described_class.delete_all
end
it 'still returns the last value to that of the given value' do
expect(subject).to eq(value)
end
end
context 'when value is less than the current last_value' do
it 'returns the current last_value' do
described_class.create!(**scope, usage: usage, last_value: 10_001)
expect(subject).to eq 10_001
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
describe '#track_greatest_and_save!' do
let(:id) { create(:internal_id) }
let(:new_last_value) { 9001 }
subject { id.track_greatest_and_save!(new_last_value) }
it 'returns new last value' do
expect(subject).to eq new_last_value
end
it 'saves the record' do
subject
expect(id.changed?).to be_falsey
end
context 'when new last value is lower than the max' do
it 'does not update the last value' do
id.update!(last_value: 10_001)
subject
expect(id.reload.last_value).to eq 10_001
end
end
end
end
|
