# encoding: utf-8
require "spec_helper"

module Hexx
  describe Helpers::Parameters do

    before { class Test; include Helpers::Parameters; end }
    let(:described_class) { Test }
    after  { Hexx.send :remove_const, :Test }

    describe "#params" do

      subject { described_class.new }

      it "is defined" do
        expect(subject).to respond_to :params
      end

      it "has no setter" do
        expect(subject).not_to respond_to :params=
      end
    end

    describe ".new" do
      
      it "accepts parameters" do
        expect { described_class.new name: "name" }.not_to raise_error
      end

      it "doesn't require parameters" do
        expect { described_class.new }.not_to raise_error
      end
    end

    describe ".allow_params" do

      it "is defined" do
        expect(described_class).to respond_to(:allow_params)
      end

      it "accepts one argument" do
        expect { described_class.send :allow_params, :name }
          .not_to raise_error
      end

      it "accepts a list of arguments" do
        expect { described_class.send :allow_params, :name, :type }
          .not_to raise_error
      end

      it "accepts an array of arguments" do
        expect { described_class.send :allow_params, %w(name type) }
          .not_to raise_error
      end

      it "requires strings or symbols" do
        expect { described_class.send :allow_params, 1 }
          .to raise_error SyntaxError
      end

      it "requires non-empty values" do
        expect { described_class.send :allow_params, "" }
          .to raise_error ArgumentError
      end

      it "requires values" do
        expect { described_class.send :allow_params }
          .to raise_error ArgumentError
      end

      context "with valid argument" do

        before  { described_class.send :allow_params, :name }
        subject { described_class.new name: "name" }

        it "allows initialization of the parameter" do
          expect(subject.params).to eq("name" => "name")
        end

        it "defines private getter for the parameter" do
          expect(described_class.private_instance_methods)
            .to be_include :name
          expect { subject.params["name"] = "new" }
            .to change { subject.send :name }.to "new"
        end

        it "defines private setter for the parameter" do
          expect(described_class.private_instance_methods)
            .to be_include :name=
          expect { subject.send :name=, "new" }
            .to change { subject.params["name"] }.to "new"
        end
      end
    end
  end
end