varvet--pundit/spec/policy_finder_spec.rb

# frozen_string_literal: true

require "spec_helper"

class Foo; end
RSpec.describe Pundit::PolicyFinder do
  let(:user) { double }
  let(:post) { Post.new(user) }
  let(:comment) { CommentFourFiveSix.new }
  let(:article) { Article.new }

  describe "#scope" do
    subject { described_class.new(post) }

    it "returns a policy scope" do
      expect(subject.scope).to eq PostPolicy::Scope
    end

    context "policy is nil" do
      it "returns nil" do
        allow(subject).to receive(:policy).and_return nil
        expect(subject.scope).to eq nil
      end
    end
  end

  describe "#policy" do
    context "with an instance" do
      it "returns the associated policy" do
        object = described_class.new(post)

        expect(object.policy).to eq PostPolicy
      end
    end

    context "with an array of symbols" do
      it "returns the associated namespaced policy" do
        object = described_class.new(%i[project post])

        expect(object.policy).to eq Project::PostPolicy
      end
    end

    context "with an array of a symbol and an instance" do
      it "returns the associated namespaced policy" do
        object = described_class.new([:project, post])

        expect(object.policy).to eq Project::PostPolicy
      end
    end

    context "with an array of a symbol and a class with a specified policy class" do
      it "returns the associated namespaced policy" do
        object = described_class.new([:project, Customer::Post])

        expect(object.policy).to eq Project::PostPolicy
      end
    end

    context "with an array of a symbol and a class with a specified model name" do
      it "returns the associated namespaced policy" do
        object = described_class.new([:project, CommentsRelation])

        expect(object.policy).to eq Project::CommentPolicy
      end
    end

    context "with a class" do
      it "returns the associated policy" do
        object = described_class.new(Post)

        expect(object.policy).to eq PostPolicy
      end
    end

    context "with a class which has a specified policy class" do
      it "returns the associated policy" do
        object = described_class.new(Customer::Post)

        expect(object.policy).to eq PostPolicy
      end
    end

    context "with an instance which has a specified policy class" do
      it "returns the associated policy" do
        object = described_class.new(Customer::Post.new(user))

        expect(object.policy).to eq PostPolicy
      end
    end

    context "with a class which has a specified model name" do
      it "returns the associated policy" do
        object = described_class.new(CommentsRelation)

        expect(object.policy).to eq CommentPolicy
      end
    end

    context "with an instance which has a specified policy class" do
      it "returns the associated policy" do
        object = described_class.new(CommentsRelation.new)

        expect(object.policy).to eq CommentPolicy
      end
    end

    context "with nil" do
      it "returns a NilClassPolicy" do
        object = described_class.new(nil)

        expect(object.policy).to eq NilClassPolicy
      end
    end

    context "with a class that doesn't have an associated policy" do
      it "returns nil" do
        object = described_class.new(Foo)

        expect(object.policy).to eq nil
      end
    end
  end

  describe "#scope!" do
    context "@object is nil" do
      subject { described_class.new(nil) }

      it "returns the NilClass policy's scope class" do
        expect(subject.scope!).to eq NilClassPolicy::Scope
      end
    end

    context "@object is defined" do
      subject { described_class.new(post) }

      it "returns the scope" do
        expect(subject.scope!).to eq PostPolicy::Scope
      end
    end
  end

  describe "#param_key" do
    context "object responds to model_name" do
      subject { described_class.new(comment) }

      it "returns the param_key" do
        expect(subject.object).to respond_to(:model_name)
        expect(subject.param_key).to eq "comment_four_five_six"
      end
    end

    context "object is a class" do
      subject { described_class.new(Article) }

      it "returns the param_key" do
        expect(subject.object).not_to respond_to(:model_name)
        expect(subject.object).to be_a Class
        expect(subject.param_key).to eq "article"
      end
    end

    context "object is an instance of a class" do
      subject { described_class.new(article) }

      it "returns the param_key" do
        expect(subject.object).not_to respond_to(:model_name)
        expect(subject.object).not_to be_a Class
        expect(subject.object).to be_an_instance_of Article

        expect(subject.param_key).to eq "article"
      end
    end

    context "object is an array" do
      subject { described_class.new([:project, article]) }

      it "returns the param_key for the last element of the array" do
        expect(subject.object).not_to respond_to(:model_name)
        expect(subject.object).not_to be_a Class
        expect(subject.object).to be_an_instance_of Array

        expect(subject.param_key).to eq "article"
      end
    end
  end
end