default_values_spec.rb

# frozen_string_literal: true

RSpec.describe "default values" do
  before do
    class Test::Foo
      extend Dry::Initializer

      param  :foo, default: proc { :FOO }
      param  :bar, default: proc { :BAR }
      option :baz, default: -> { :BAZ }
      option :qux, default: proc { foo }
      option :mox, default: -> { default_mox }

      private

      def default_mox
        :MOX
      end
    end
  end

  it "instantiate arguments" do
    subject = Test::Foo.new(1, 2, baz: 3, qux: 4)

    expect(subject.foo).to eql 1
    expect(subject.bar).to eql 2
    expect(subject.baz).to eql 3
    expect(subject.qux).to eql 4
  end

  it "applies default values" do
    subject = Test::Foo.new

    expect(subject.foo).to eql :FOO
    expect(subject.bar).to eql :BAR
    expect(subject.baz).to eql :BAZ
    expect(subject.qux).to eql :FOO
  end

  it "applies default values partially" do
    subject = Test::Foo.new 1, baz: 3

    expect(subject.foo).to eql 1
    expect(subject.bar).to eql :BAR
    expect(subject.baz).to eql 3
    expect(subject.qux).to eql 1
  end

  it "applies default values from private methods" do
    subject = Test::Foo.new
    expect(subject.mox).to eql :MOX
  end

  describe "when the last param has a default and there are no options" do
    before do
      class Test::Bar
        extend Dry::Initializer

        param :foo
        param :bar, default: proc { {} }
      end
    end

    it "instantiates arguments" do
      subject = Test::Bar.new(1, 2)

      expect(subject.foo).to eql 1
      expect(subject.bar).to eql 2
    end

    it "applies default values" do
      subject = Test::Bar.new(1)

      expect(subject.foo).to eql 1
      expect(subject.bar).to eql({})
    end

    it "instantiates arguments also if the last is an hash" do
      subject = Test::Bar.new(1, {baz: 2, qux: 3})

      expect(subject.foo).to eql 1
      expect(subject.bar).to eql({baz: 2, qux: 3})
    end
  end
end