Contents

require "spec_helper"

describe GraphQL::Language::Visitor do
  let(:document) { GraphQL.parse("
    query cheese { cheese(id: 1) { flavor, source, producers(first: 3) { name } } }
    fragment cheeseFields on Cheese { flavor }
    ")}
  let(:counts) { {fields_entered: 0, arguments_entered: 0, arguments_left: 0, argument_names: []} }

  let(:visitor) do
    v = GraphQL::Language::Visitor.new
    v[GraphQL::Language::Nodes::Field] << -> (node, parent) { counts[:fields_entered] += 1 }
    # two ways to set up enter hooks:
    v[GraphQL::Language::Nodes::Argument] <<       -> (node, parent) { counts[:argument_names] << node.name }
    v[GraphQL::Language::Nodes::Argument].enter << -> (node, parent) { counts[:arguments_entered] += 1}
    v[GraphQL::Language::Nodes::Argument].leave << -> (node, parent) { counts[:arguments_left] += 1 }

    v[GraphQL::Language::Nodes::Document].leave << -> (node, parent) { counts[:finished] = true }
    v
  end

  it "calls hooks during a depth-first tree traversal" do
    assert_equal(2, visitor[GraphQL::Language::Nodes::Argument].enter.length)
    visitor.visit(document)
    assert_equal(6, counts[:fields_entered])
    assert_equal(2, counts[:arguments_entered])
    assert_equal(2, counts[:arguments_left])
    assert_equal(["id", "first"], counts[:argument_names])
    assert(counts[:finished])
  end

  describe "Visitor::SKIP" do
    it "skips the rest of the node" do
      visitor[GraphQL::Language::Nodes::Document] << -> (node, parent) { GraphQL::Language::Visitor::SKIP }
      visitor.visit(document)
      assert_equal(0, counts[:fields_entered])
    end
  end
end

Version data entries

8 entries across 8 versions & 1 rubygems

Version	Path
graphql-0.15.3	spec/graphql/language/visitor_spec.rb
graphql-0.15.2	spec/graphql/language/visitor_spec.rb
graphql-0.14.2	spec/graphql/language/visitor_spec.rb
graphql-0.15.1	spec/graphql/language/visitor_spec.rb
graphql-0.15.0	spec/graphql/language/visitor_spec.rb
graphql-0.14.1	spec/graphql/language/visitor_spec.rb
graphql-0.14.0	spec/graphql/language/visitor_spec.rb
graphql-0.13.0	spec/graphql/language/visitor_spec.rb