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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::RelativePositioning::ItemContext do
let_it_be(:default_user) { create_default(:user) }
let_it_be(:project, reload: true) { create(:project) }
def create_issue(pos)
create(:issue, project: project, relative_position: pos)
end
range = (101..107) # A deliberately small range, so we can test everything
indices = (0..).take(range.size)
let(:start) { ((range.first + range.last) / 2.0).floor }
let(:subjects) { issues.map { |i| described_class.new(i.reset, range) } }
# This allows us to refer to range in methods and examples
let_it_be(:full_range) { range }
context 'there are gaps at the start and end' do
let_it_be(:issues) { (range.first.succ..range.last.pred).map { |pos| create_issue(pos) } }
it 'is always possible to find a gap' do
expect(subjects)
.to all(have_attributes(find_next_gap_before: be_present, find_next_gap_after: be_present))
end
where(:index) { indices.reverse.drop(2) }
with_them do
subject { subjects[index] }
let(:positions) { subject.scoped_items.map(&:relative_position) }
it 'is possible to shift_right, which will consume the gap at the end' do
subject.shift_right
expect(subject.find_next_gap_after).not_to be_present
expect(positions).to all(be_between(range.first, range.last))
expect(positions).to eq(positions.uniq)
end
it 'is possible to create_space_right, which will move the gap to immediately after' do
subject.create_space_right
expect(subject.find_next_gap_after).to have_attributes(start_pos: subject.relative_position)
expect(positions).to all(be_between(range.first, range.last))
expect(positions).to eq(positions.uniq)
end
it 'is possible to shift_left, which will consume the gap at the start' do
subject.shift_left
expect(subject.find_next_gap_before).not_to be_present
expect(positions).to all(be_between(range.first, range.last))
expect(positions).to eq(positions.uniq)
end
it 'is possible to create_space_left, which will move the gap to immediately before' do
subject.create_space_left
expect(subject.find_next_gap_before).to have_attributes(start_pos: subject.relative_position)
expect(positions).to all(be_between(range.first, range.last))
expect(positions).to eq(positions.uniq)
end
end
end
context 'there is a gap of multiple spaces' do
let_it_be(:issues) { [range.first, range.last].map { |pos| create_issue(pos) } }
it 'is impossible to move the last element to the right' do
expect { subjects.last.shift_right }.to raise_error(Gitlab::RelativePositioning::NoSpaceLeft)
end
it 'is impossible to move the first element to the left' do
expect { subjects.first.shift_left }.to raise_error(Gitlab::RelativePositioning::NoSpaceLeft)
end
it 'is possible to move the last element to the left' do
subject = subjects.last
expect { subject.shift_left }.to change { subject.relative_position }.by(be < 0)
end
it 'is possible to move the first element to the right' do
subject = subjects.first
expect { subject.shift_right }.to change { subject.relative_position }.by(be > 0)
end
it 'is possible to find the gap from the right' do
gap = Gitlab::RelativePositioning::Gap.new(range.last, range.first)
expect(subjects.last).to have_attributes(
find_next_gap_before: eq(gap),
find_next_gap_after: be_nil
)
end
it 'is possible to find the gap from the left' do
gap = Gitlab::RelativePositioning::Gap.new(range.first, range.last)
expect(subjects.first).to have_attributes(
find_next_gap_before: be_nil,
find_next_gap_after: eq(gap)
)
end
end
context 'there are several free spaces' do
let_it_be(:issues) { range.select(&:even?).map { |pos| create_issue(pos) } }
let_it_be(:gaps) do
range.select(&:odd?).map do |pos|
rhs = pos.succ.clamp(range.first, range.last)
lhs = pos.pred.clamp(range.first, range.last)
{
before: Gitlab::RelativePositioning::Gap.new(rhs, lhs),
after: Gitlab::RelativePositioning::Gap.new(lhs, rhs)
}
end
end
def issue_at(position)
issues.find { |i| i.relative_position == position }
end
where(:current_pos) { range.select(&:even?) }
with_them do
let(:subject) { subjects.find { |s| s.relative_position == current_pos } }
let(:siblings) { subjects.reject { |s| s.relative_position == current_pos } }
def covered_by_range(pos)
full_range.cover?(pos) ? pos : nil
end
it 'finds the closest gap' do
closest_gap_before = gaps
.map { |gap| gap[:before] }
.select { |gap| gap.start_pos <= subject.relative_position }
.max_by { |gap| gap.start_pos }
closest_gap_after = gaps
.map { |gap| gap[:after] }
.select { |gap| gap.start_pos >= subject.relative_position }
.min_by { |gap| gap.start_pos }
expect(subject).to have_attributes(
find_next_gap_before: closest_gap_before,
find_next_gap_after: closest_gap_after
)
end
it 'finds the neighbours' do
expect(subject).to have_attributes(
lhs_neighbour: subject.neighbour(issue_at(subject.relative_position - 2)),
rhs_neighbour: subject.neighbour(issue_at(subject.relative_position + 2))
)
end
it 'finds the next relative_positions' do
expect(subject).to have_attributes(
prev_relative_position: covered_by_range(subject.relative_position - 2),
next_relative_position: covered_by_range(subject.relative_position + 2)
)
end
it 'finds the min/max positions' do
expect(subject).to have_attributes(
min_relative_position: issues.first.relative_position,
max_relative_position: issues.last.relative_position
)
end
it 'finds the min/max siblings' do
expect(subject).to have_attributes(
min_sibling: siblings.first,
max_sibling: siblings.last
)
end
end
end
context 'there is at least one free space' do
where(:free_space) { range.to_a }
with_them do
let(:issues) { range.reject { |x| x == free_space }.map { |p| create_issue(p) } }
let(:gap_rhs) { free_space.succ.clamp(range.first, range.last) }
let(:gap_lhs) { free_space.pred.clamp(range.first, range.last) }
it 'can always find a gap before if there is space to the left' do
expected_gap = Gitlab::RelativePositioning::Gap.new(gap_rhs, gap_lhs)
to_the_right_of_gap = subjects.select { |s| free_space < s.relative_position }
expect(to_the_right_of_gap)
.to all(have_attributes(find_next_gap_before: eq(expected_gap), find_next_gap_after: be_nil))
end
it 'can always find a gap after if there is space to the right' do
expected_gap = Gitlab::RelativePositioning::Gap.new(gap_lhs, gap_rhs)
to_the_left_of_gap = subjects.select { |s| s.relative_position < free_space }
expect(to_the_left_of_gap)
.to all(have_attributes(find_next_gap_before: be_nil, find_next_gap_after: eq(expected_gap)))
end
end
end
end
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