gitlab-org--gitlab-foss/spec/lib/api/helpers/pagination_spec.rb

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Ruby
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require 'spec_helper'
describe API::Helpers::Pagination do
let(:resource) { Project.all }
subject do
Class.new.include(described_class).new
end
describe '#paginate' do
let(:value) { spy('return value') }
before do
allow(value).to receive(:to_query).and_return(value)
allow(subject).to receive(:header).and_return(value)
allow(subject).to receive(:params).and_return(value)
allow(subject).to receive(:request).and_return(value)
end
describe 'required instance methods' do
let(:return_spy) { spy }
it 'requires some instance methods' do
expect_message(:header)
expect_message(:params)
expect_message(:request)
subject.paginate(resource)
end
end
context 'when resource can be paginated' do
before do
create_list(:project, 3)
end
describe 'first page' do
before do
allow(subject).to receive(:params)
.and_return({ page: 1, per_page: 2 })
end
it 'returns appropriate amount of resources' do
expect(subject.paginate(resource).count).to eq 2
end
it 'adds appropriate headers' do
expect_header('X-Total', '3')
expect_header('X-Total-Pages', '2')
expect_header('X-Per-Page', '2')
expect_header('X-Page', '1')
expect_header('X-Next-Page', '2')
expect_header('X-Prev-Page', '')
expect_header('Link', any_args)
subject.paginate(resource)
end
end
describe 'second page' do
before do
allow(subject).to receive(:params)
.and_return({ page: 2, per_page: 2 })
end
it 'returns appropriate amount of resources' do
expect(subject.paginate(resource).count).to eq 1
end
it 'adds appropriate headers' do
expect_header('X-Total', '3')
expect_header('X-Total-Pages', '2')
expect_header('X-Per-Page', '2')
expect_header('X-Page', '2')
expect_header('X-Next-Page', '')
expect_header('X-Prev-Page', '1')
expect_header('Link', any_args)
subject.paginate(resource)
end
end
end
def expect_header(name, value)
expect(subject).to receive(:header).with(name, value)
end
def expect_message(method)
expect(subject).to receive(method)
.at_least(:once).and_return(value)
end
end
end