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require "spec_helper"
describe Solve::RubySolver do
describe "ClassMethods" do
describe "::timeout" do
subject { described_class.timeout }
it "returns 30,000 by default" do
expect(subject).to eql(30_000)
end
context "when the SOLVE_TIMEOUT env variable is set" do
before { ENV.stub(:[]).with("SOLVE_TIMEOUT") { "30" } }
it "returns the value multiplied by a thousand" do
expect(subject).to eql(30_000)
end
end
end
describe "::activate" do
it "is a no-op" do
described_class.activate
end
end
end
let(:graph) { double(Solve::Graph) }
let(:demands) { [["mysql"], ["nginx"]] }
subject(:solver) { described_class.new(graph, demands, dependency_source: "Berksfile") }
it "has a list of demands as ruby literals" do
solver.demands_array.should == demands
end
it "has a list of demands as model objects" do
expected = [
Solve::Demand.new(solver, "mysql"),
Solve::Demand.new(solver, "nginx"),
]
solver.demands.should == expected
end
it "has a graph" do
solver.graph.should == graph
end
describe "when the constraints are solvable" do
let(:graph) do
graph = Solve::Graph.new
graph.artifact("A", "1.0.0")
graph.artifact("B", "1.0.0").depends("A")
graph
end
let(:demands) { [["A"], ["B"]] }
it "gives the solution as a Hash" do
solver.resolve.should == { "A" => "1.0.0", "B" => "1.0.0" }
end
it "gives the solution in sorted form" do
solver.resolve(sorted: true).should == [["A", "1.0.0"], ["B", "1.0.0"]]
end
end
describe "when the constraints are not solvable" do
let(:error) do
begin
solver.resolve
rescue => e
e
else
raise "Expected resolve to cause an error"
end
end
context "and molinillo identifies missing artifacts" do
let(:graph) do
graph = Solve::Graph.new
graph.artifact("A", "1.0.0")
graph
end
let(:demands) { [ ["Z"] ] }
it "raises an error detailing the missing artifacts" do
expect(error).to be_a_kind_of(Solve::Errors::NoSolutionError)
expected_error = <<~ERROR_MESSAGE
Unable to satisfy the following requirements:
- `Z (>= 0.0.0)` required by `Berksfile`
ERROR_MESSAGE
expect(error.to_s).to eq(expected_error)
end
end
context "and molinillo identifies constraints that exclude all known versions" do
let(:graph) do
graph = Solve::Graph.new
graph.artifact("A", "1.0.0")
graph
end
let(:demands) { [ ["A", "> 1.0.0"] ] }
it "raises an error detailing the missing artifacts" do
expect(error).to be_a_kind_of(Solve::Errors::NoSolutionError)
expected_error = <<~ERROR_MESSAGE
Unable to satisfy the following requirements:
- `A (> 1.0.0)` required by `Berksfile`
ERROR_MESSAGE
expect(error.to_s).to eq(expected_error)
end
end
context "and molinillo identifies dependency conflicts" do
let(:graph) do
graph = Solve::Graph.new
graph.artifact("A", "1.0.0").depends("B").depends("C")
graph.artifact("B", "1.0.0").depends("D", "= 1.0.0")
graph.artifact("C", "1.0.0").depends("D", "= 2.0.0")
graph.artifact("D", "1.0.0")
graph.artifact("D", "2.0.0")
graph
end
let(:demands) { [ [ "A" ] ] }
it "raises an error detailing the missing artifacts" do
expect(error).to be_a_kind_of(Solve::Errors::NoSolutionError)
expected_error = <<~ERROR_MESSAGE
Unable to satisfy the following requirements:
- `D (= 1.0.0)` required by `B-1.0.0`
- `D (= 2.0.0)` required by `C-1.0.0`
ERROR_MESSAGE
expect(error.to_s).to eq(expected_error)
end
end
end
describe "supporting Serializer interface" do
let(:serializer) { Solve::Solver::Serializer.new }
before do
graph.stub(:artifacts).and_return([])
end
it "implements the required interface" do
problem = Solve::Problem.from_solver(solver)
json_string = serializer.serialize(problem)
problem_data = JSON.parse(json_string)
expected_demands = [
{ "name" => "mysql", "constraint" => ">= 0.0.0" },
{ "name" => "nginx", "constraint" => ">= 0.0.0" },
]
problem_data["demands"].should =~ expected_demands
end
end
end
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