138 lines
3.9 KiB
Ruby
138 lines
3.9 KiB
Ruby
require 'spec_helper'
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describe API::Helpers::Pagination do
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let(:resource) { Project.all }
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subject do
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Class.new.include(described_class).new
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end
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describe '#paginate' do
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let(:value) { spy('return value') }
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before do
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allow(value).to receive(:to_query).and_return(value)
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allow(subject).to receive(:header).and_return(value)
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allow(subject).to receive(:params).and_return(value)
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allow(subject).to receive(:request).and_return(value)
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end
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describe 'required instance methods' do
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let(:return_spy) { spy }
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it 'requires some instance methods' do
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expect_message(:header)
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expect_message(:params)
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expect_message(:request)
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subject.paginate(resource)
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end
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end
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context 'when resource can be paginated' do
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before do
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create_list(:project, 3)
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end
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describe 'first page' do
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before do
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allow(subject).to receive(:params)
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.and_return({ page: 1, per_page: 2 })
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end
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it 'returns appropriate amount of resources' do
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expect(subject.paginate(resource).count).to eq 2
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end
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it 'adds appropriate headers' do
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expect_header('X-Total', '3')
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expect_header('X-Total-Pages', '2')
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expect_header('X-Per-Page', '2')
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expect_header('X-Page', '1')
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expect_header('X-Next-Page', '2')
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expect_header('X-Prev-Page', '')
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expect_header('Link', anything) do |_key, val|
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expect(val).to include('rel="first"')
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expect(val).to include('rel="last"')
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expect(val).to include('rel="next"')
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expect(val).not_to include('rel="prev"')
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end
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subject.paginate(resource)
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end
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end
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describe 'second page' do
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before do
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allow(subject).to receive(:params)
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.and_return({ page: 2, per_page: 2 })
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end
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it 'returns appropriate amount of resources' do
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expect(subject.paginate(resource).count).to eq 1
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end
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it 'adds appropriate headers' do
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expect_header('X-Total', '3')
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expect_header('X-Total-Pages', '2')
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expect_header('X-Per-Page', '2')
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expect_header('X-Page', '2')
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expect_header('X-Next-Page', '')
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expect_header('X-Prev-Page', '1')
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expect_header('Link', anything) do |_key, val|
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expect(val).to include('rel="first"')
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expect(val).to include('rel="last"')
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expect(val).to include('rel="prev"')
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expect(val).not_to include('rel="next"')
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end
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subject.paginate(resource)
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end
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end
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end
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context 'when resource empty' do
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describe 'first page' do
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before do
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allow(subject).to receive(:params)
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.and_return({ page: 1, per_page: 2 })
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end
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it 'returns appropriate amount of resources' do
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expect(subject.paginate(resource).count).to eq 0
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end
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it 'adds appropriate headers' do
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expect_header('X-Total', '0')
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expect_header('X-Total-Pages', '1')
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expect_header('X-Per-Page', '2')
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expect_header('X-Page', '1')
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expect_header('X-Next-Page', '')
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expect_header('X-Prev-Page', '')
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expect_header('Link', anything) do |_key, val|
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expect(val).to include('rel="first"')
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expect(val).to include('rel="last"')
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expect(val).not_to include('rel="prev"')
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expect(val).not_to include('rel="next"')
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expect(val).not_to include('page=0')
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end
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subject.paginate(resource)
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end
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end
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end
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def expect_header(*args, &block)
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expect(subject).to receive(:header).with(*args, &block)
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end
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def expect_message(method)
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expect(subject).to receive(method)
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.at_least(:once).and_return(value)
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end
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end
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end
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