76 lines
2.2 KiB
Ruby
76 lines
2.2 KiB
Ruby
# frozen_string_literal: true
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require 'spec_helper'
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describe Gitlab::Pagination::Keyset::Pager do
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let(:relation) { Project.all.order(id: :asc) }
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let(:request) { double('request', page: page, apply_headers: nil) }
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let(:page) { Gitlab::Pagination::Keyset::Page.new(order_by: { id: :asc }, per_page: 3) }
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let(:next_page) { double('next page') }
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before_all do
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create_list(:project, 7)
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end
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describe '#paginate' do
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subject { described_class.new(request).paginate(relation) }
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it 'does not execute a query' do
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expect do
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subject
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end.not_to exceed_query_limit(0)
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end
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it 'applies a LIMIT' do
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expect(subject.limit_value).to eq(page.per_page)
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end
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it 'returns the limited relation' do
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expect(subject).to eq(relation.limit(page.per_page))
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end
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context 'validating the order clause' do
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let(:page) { Gitlab::Pagination::Keyset::Page.new(order_by: { created_at: :asc }, per_page: 3) }
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it 'raises an error if has a different order clause than the page' do
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expect { subject }.to raise_error(ArgumentError, /order_by does not match/)
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end
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end
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end
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describe '#finalize' do
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let(:records) { relation.limit(page.per_page).load }
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subject { described_class.new(request).finalize(records) }
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it 'passes information about next page to request' do
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lower_bounds = records.last.slice(:id)
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expect(page).to receive(:next).with(lower_bounds).and_return(next_page)
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expect(request).to receive(:apply_headers).with(next_page)
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subject
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end
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context 'when retrieving the last page' do
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let(:relation) { Project.where('id > ?', Project.maximum(:id) - page.per_page).order(id: :asc) }
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it 'indicates there is another (likely empty) page' do
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lower_bounds = records.last.slice(:id)
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expect(page).to receive(:next).with(lower_bounds).and_return(next_page)
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expect(request).to receive(:apply_headers).with(next_page)
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subject
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end
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end
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context 'when retrieving an empty page' do
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let(:relation) { Project.where('id > ?', Project.maximum(:id) + 1).order(id: :asc) }
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it 'indicates this is the last page' do
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expect(request).not_to receive(:apply_headers)
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subject
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end
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end
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end
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end
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