debian-mirror-gitlab/spec/lib/api/helpers/pagination_strategies_spec.rb

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2020-03-13 15:44:24 +05:30
# frozen_string_literal: true
require 'spec_helper'
describe API::Helpers::PaginationStrategies do
subject { Class.new.include(described_class).new }
let(:expected_result) { double("result") }
let(:relation) { double("relation") }
let(:params) { {} }
before do
allow(subject).to receive(:params).and_return(params)
end
describe '#paginate_with_strategies' do
let(:paginator) { double("paginator", paginate: expected_result, finalize: nil) }
before do
allow(subject).to receive(:paginator).with(relation).and_return(paginator)
end
it 'yields paginated relation' do
expect { |b| subject.paginate_with_strategies(relation, &b) }.to yield_with_args(expected_result)
end
it 'calls #finalize with first value returned from block' do
return_value = double
expect(paginator).to receive(:finalize).with(return_value)
subject.paginate_with_strategies(relation) do |records|
some_options = {}
[return_value, some_options]
end
end
it 'returns whatever the block returns' do
return_value = [double, double]
result = subject.paginate_with_strategies(relation) do |records|
return_value
end
expect(result).to eq(return_value)
end
end
describe '#paginator' do
context 'offset pagination' do
let(:paginator) { double("paginator") }
before do
allow(subject).to receive(:keyset_pagination_enabled?).and_return(false)
end
it 'delegates to OffsetPagination' do
expect(Gitlab::Pagination::OffsetPagination).to receive(:new).with(subject).and_return(paginator)
expect(subject.paginator(relation)).to eq(paginator)
end
end
context 'for keyset pagination' do
let(:params) { { pagination: 'keyset' } }
let(:request_context) { double('request context') }
let(:pager) { double('pager') }
before do
allow(subject).to receive(:keyset_pagination_enabled?).and_return(true)
allow(Gitlab::Pagination::Keyset::RequestContext).to receive(:new).with(subject).and_return(request_context)
end
context 'when keyset pagination is available' do
before do
allow(Gitlab::Pagination::Keyset).to receive(:available?).and_return(true)
allow(Gitlab::Pagination::Keyset::Pager).to receive(:new).with(request_context).and_return(pager)
end
it 'delegates to Pager' do
expect(subject.paginator(relation)).to eq(pager)
end
end
context 'when keyset pagination is not available' do
before do
allow(Gitlab::Pagination::Keyset).to receive(:available?).with(request_context, relation).and_return(false)
end
it 'renders a 501 error' do
expect(subject).to receive(:error!).with(/not yet available/, 405)
subject.paginator(relation)
end
end
end
end
end