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require 'test_helper'
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class EnsureNoCycleTest < ActiveSupport::TestCase
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def setup
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base = []
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base.push Edge.new(1, 2)
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base.push Edge.new(2, 3)
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base.push Edge.new(3, 4)
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base.push Edge.new(3, 5)
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base.push Edge.new(2, 6)
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@graph = ActiveRecord::Base::EnsureNoCycle.new(base, :source, :target)
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end
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class Edge < OpenStruct
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include ActiveModel::Validations
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extend ActiveModel::Naming
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attr_accessor :source, :target
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def initialize(source, target)
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self.source = source
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self.target = target
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end
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end
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test "#tsort_each_node iterates over all nodes" do
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found = []
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@graph.tsort_each_node { |node| found.push node }
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assert_equal [1, 2, 3, 4, 5, 6], found
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end
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test "#tsort_each_child(node) finds all children for node" do
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found = []
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assert @graph.tsort_each_child(1) { |node| found.push node }
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assert_equal [2], found
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found = []
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assert @graph.tsort_each_child(2) { |node| found.push node }
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assert_equal [3, 6], found
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found = []
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assert @graph.tsort_each_child(3) { |node| found.push node }
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assert_equal [4, 5], found
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found = []
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assert @graph.tsort_each_child(4) { |node| found.push node }
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assert_equal [], found
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end
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test "#ensure detects cycle and raises an exception" do
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record = Edge.new(6, 1)
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assert_raises Foreman::CyclicGraphException do
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@graph.ensure(record)
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end
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assert record.errors[:base].present?, 'cycle did not add error to record'
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end
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test "#ensure passes when record does not create cycle" do
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record = Edge.new(2, 4)
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assert_nothing_raised do
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assert @graph.ensure(record)
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end
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end
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end
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