232 lines
7.9 KiB
Ruby
232 lines
7.9 KiB
Ruby
# frozen_string_literal: true
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require 'spec_helper'
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RSpec.describe Gitlab::RelativePositioning::ItemContext do
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let_it_be(:default_user) { create_default(:user) }
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let_it_be(:project, reload: true) { create(:project) }
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def create_issue(pos)
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create(:issue, project: project, relative_position: pos)
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end
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range = (101..107) # A deliberately small range, so we can test everything
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indices = (0..).take(range.size)
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let(:start) { ((range.first + range.last) / 2.0).floor }
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let(:subjects) { issues.map { |i| described_class.new(i.reset, range) } }
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# This allows us to refer to range in methods and examples
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let_it_be(:full_range) { range }
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context 'there are gaps at the start and end' do
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let_it_be(:issues) { (range.first.succ..range.last.pred).map { |pos| create_issue(pos) } }
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it 'is always possible to find a gap' do
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expect(subjects)
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.to all(have_attributes(find_next_gap_before: be_present, find_next_gap_after: be_present))
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end
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where(:index) { indices.reverse.drop(2) }
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with_them do
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subject { subjects[index] }
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let(:positions) { subject.scoped_items.map(&:relative_position) }
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it 'is possible to shift_right, which will consume the gap at the end' do
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subject.shift_right
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expect(subject.find_next_gap_after).not_to be_present
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expect(positions).to all(be_between(range.first, range.last))
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expect(positions).to eq(positions.uniq)
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end
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it 'is possible to create_space_right, which will move the gap to immediately after' do
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subject.create_space_right
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expect(subject.find_next_gap_after).to have_attributes(start_pos: subject.relative_position)
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expect(positions).to all(be_between(range.first, range.last))
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expect(positions).to eq(positions.uniq)
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end
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it 'is possible to shift_left, which will consume the gap at the start' do
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subject.shift_left
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expect(subject.find_next_gap_before).not_to be_present
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expect(positions).to all(be_between(range.first, range.last))
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expect(positions).to eq(positions.uniq)
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end
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it 'is possible to create_space_left, which will move the gap to immediately before' do
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subject.create_space_left
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expect(subject.find_next_gap_before).to have_attributes(start_pos: subject.relative_position)
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expect(positions).to all(be_between(range.first, range.last))
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expect(positions).to eq(positions.uniq)
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end
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end
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end
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context 'there is a gap of multiple spaces' do
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let_it_be(:issues) { [range.first, range.last].map { |pos| create_issue(pos) } }
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it 'is impossible to move the last element to the right' do
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expect { subjects.last.shift_right }.to raise_error(Gitlab::RelativePositioning::NoSpaceLeft)
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end
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it 'is impossible to move the first element to the left' do
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expect { subjects.first.shift_left }.to raise_error(Gitlab::RelativePositioning::NoSpaceLeft)
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end
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it 'is possible to move the last element to the left' do
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subject = subjects.last
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expect { subject.shift_left }.to change { subject.relative_position }.by(be < 0)
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end
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it 'is possible to move the first element to the right' do
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subject = subjects.first
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expect { subject.shift_right }.to change { subject.relative_position }.by(be > 0)
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end
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it 'is possible to find the gap from the right' do
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gap = Gitlab::RelativePositioning::Gap.new(range.last, range.first)
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expect(subjects.last).to have_attributes(
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find_next_gap_before: eq(gap),
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find_next_gap_after: be_nil
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)
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end
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it 'is possible to find the gap from the left' do
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gap = Gitlab::RelativePositioning::Gap.new(range.first, range.last)
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expect(subjects.first).to have_attributes(
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find_next_gap_before: be_nil,
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find_next_gap_after: eq(gap)
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)
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end
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end
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context 'there are several free spaces' do
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let_it_be(:issues) { range.select(&:even?).map { |pos| create_issue(pos) } }
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let_it_be(:gaps) do
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range.select(&:odd?).map do |pos|
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rhs = pos.succ.clamp(range.first, range.last)
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lhs = pos.pred.clamp(range.first, range.last)
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{
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before: Gitlab::RelativePositioning::Gap.new(rhs, lhs),
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after: Gitlab::RelativePositioning::Gap.new(lhs, rhs)
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}
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end
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end
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def issue_at(position)
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issues.find { |i| i.relative_position == position }
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end
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where(:current_pos) { range.select(&:even?) }
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with_them do
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let(:subject) { subjects.find { |s| s.relative_position == current_pos } }
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let(:siblings) { subjects.reject { |s| s.relative_position == current_pos } }
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def covered_by_range(pos)
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full_range.cover?(pos) ? pos : nil
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end
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it 'finds the closest gap' do
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closest_gap_before = gaps
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.map { |gap| gap[:before] }
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.select { |gap| gap.start_pos <= subject.relative_position }
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.max_by { |gap| gap.start_pos }
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closest_gap_after = gaps
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.map { |gap| gap[:after] }
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.select { |gap| gap.start_pos >= subject.relative_position }
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.min_by { |gap| gap.start_pos }
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expect(subject).to have_attributes(
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find_next_gap_before: closest_gap_before,
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find_next_gap_after: closest_gap_after
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)
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end
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it 'finds the neighbours' do
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expect(subject).to have_attributes(
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lhs_neighbour: subject.neighbour(issue_at(subject.relative_position - 2)),
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rhs_neighbour: subject.neighbour(issue_at(subject.relative_position + 2))
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)
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end
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it 'finds the next relative_positions' do
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expect(subject).to have_attributes(
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prev_relative_position: covered_by_range(subject.relative_position - 2),
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next_relative_position: covered_by_range(subject.relative_position + 2)
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)
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end
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it 'finds the min/max positions' do
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expect(subject).to have_attributes(
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min_relative_position: issues.first.relative_position,
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max_relative_position: issues.last.relative_position
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)
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end
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it 'finds the min/max siblings' do
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expect(subject).to have_attributes(
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min_sibling: siblings.first,
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max_sibling: siblings.last
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)
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end
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end
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end
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context 'there is at least one free space' do
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where(:free_space) { range.to_a }
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with_them do
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let(:issues) { range.reject { |x| x == free_space }.map { |p| create_issue(p) } }
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let(:gap_rhs) { free_space.succ.clamp(range.first, range.last) }
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let(:gap_lhs) { free_space.pred.clamp(range.first, range.last) }
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it 'can always find a gap before if there is space to the left' do
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expected_gap = Gitlab::RelativePositioning::Gap.new(gap_rhs, gap_lhs)
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to_the_right_of_gap = subjects.select { |s| free_space < s.relative_position }
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expect(to_the_right_of_gap)
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.to all(have_attributes(find_next_gap_before: eq(expected_gap), find_next_gap_after: be_nil))
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end
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it 'can always find a gap after if there is space to the right' do
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expected_gap = Gitlab::RelativePositioning::Gap.new(gap_lhs, gap_rhs)
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to_the_left_of_gap = subjects.select { |s| s.relative_position < free_space }
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expect(to_the_left_of_gap)
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.to all(have_attributes(find_next_gap_before: be_nil, find_next_gap_after: eq(expected_gap)))
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end
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end
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end
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describe '#at_position' do
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let_it_be(:issue) { create_issue(500) }
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let_it_be(:issue_2) { create_issue(510) }
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let(:subject) { described_class.new(issue, range) }
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it 'finds the item at the specified position' do
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expect(subject.at_position(500)).to eq(described_class.new(issue, range))
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expect(subject.at_position(510)).to eq(described_class.new(issue_2, range))
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end
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it 'raises InvalidPosition when the item cannot be found' do
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expect { subject.at_position(501) }.to raise_error Gitlab::RelativePositioning::InvalidPosition
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end
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end
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end
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