95 行
2.6 KiB
Ruby
95 行
2.6 KiB
Ruby
require 'rails_helper'
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RSpec.describe PostImplication, type: :model do
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let!(:post_record) do
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Post.create!(
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title: 'post',
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url: 'https://example.com/post-implication-post'
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)
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end
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let!(:parent_post) do
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Post.create!(
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title: 'parent post',
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url: 'https://example.com/post-implication-parent'
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)
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end
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it 'is valid with post and parent_post' do
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implication = described_class.new(
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post: post_record,
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parent_post:
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)
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expect(implication).to be_valid
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end
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it 'does not allow same post as parent_post' do
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implication = described_class.new(
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post: post_record,
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parent_post: post_record
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)
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expect(implication).not_to be_valid
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expect(implication.errors[:parent_post_id]).to be_present
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end
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it 'does not allow duplicate pair' do
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described_class.create!(
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post: post_record,
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parent_post:
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)
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duplicate = described_class.new(
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post: post_record,
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parent_post:
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)
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expect(duplicate).not_to be_valid
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expect(duplicate.errors[:post_id]).to be_present
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end
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it 'rejects a parent that would create a two-post cycle' do
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described_class.create!(post: post_record, parent_post:)
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implication = described_class.new(
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post: parent_post, parent_post: post_record)
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expect(implication).not_to be_valid
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expect(implication.errors.of_kind?(:parent_post_id, :invalid)).to be true
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end
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it 'rejects a parent that would create a three-post cycle' do
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ancestor_post = create(:post)
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described_class.create!(post: post_record, parent_post:)
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described_class.create!(post: parent_post, parent_post: ancestor_post)
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implication = described_class.new(
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post: ancestor_post, parent_post: post_record)
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expect(implication).not_to be_valid
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expect(implication.errors.of_kind?(:parent_post_id, :invalid)).to be true
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end
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it 'allows a parent with an ancestor when no cycle would result' do
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ancestor_post = create(:post)
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described_class.create!(post: parent_post, parent_post: ancestor_post)
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implication = described_class.new(post: post_record, parent_post:)
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expect(implication).to be_valid
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end
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it 'terminates when existing ancestors already contain a cycle' do
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ancestor_post = create(:post)
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described_class.create!(post: parent_post, parent_post: ancestor_post)
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legacy_implication = described_class.new(
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post: ancestor_post, parent_post:)
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legacy_implication.save!(validate: false)
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implication = described_class.new(post: post_record, parent_post:)
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expect(implication).to be_valid
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end
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end
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