require 'spec_helper'

describe "Solutions" do
  it "chooses the best artifact for the demands" do
    graph = Solve::Graph.new
    graph.artifacts("mysql", "2.0.0")
    graph.artifacts("mysql", "1.2.0")
    graph.artifacts("nginx", "1.0.0").depends("mysql", "= 1.2.0")
    graph.demands('nginx')
    graph.demands('mysql')

    Solve.it(graph).should eql("nginx" => "1.0.0", "mysql" => "1.2.0")
  end

  it "raises NoSolutionError when a solution cannot be found" do
    graph = Solve::Graph.new
    graph.artifacts("mysql", "1.2.0")

    graph.demands("mysql", ">= 2.0.0")

    lambda {
      Solve.it!(graph)
    }.should raise_error(Solve::NoSolutionError)
  end
end