class_transformations_spec.rb

# frozen_string_literal: true

require "dry/equalizer"

RSpec.describe Dry::Transformer::ClassTransformations do
  describe ".constructor_inject" do
    let(:klass) do
      Struct.new(:name, :age) { include Dry::Equalizer.new(:name, :age) }
    end

    it "returns a new object initialized with the given arguments" do
      constructor_inject = described_class.t(:constructor_inject, klass)

      input = ["Jane", 25]
      output = klass.new(*input)
      result = constructor_inject[*input]

      expect(result).to eql(output)
      expect(result).to be_instance_of(klass)
    end
  end

  describe ".set_ivars" do
    let(:klass) do
      Class.new do
        include Dry::Equalizer.new(:name, :age)

        attr_reader :name, :age, :test

        def initialize(name:, age:)
          @name = name
          @age = age
          @test = true
        end
      end
    end

    it "allocates a new object and sets instance variables from hash key/value pairs" do
      set_ivars = described_class.t(:set_ivars, klass)

      input = { name: "Jane", age: 25 }
      output = klass.new(**input)
      result = set_ivars[input]

      expect(result).to eql(output)
      expect(result.test).to be(nil)
      expect(result).to be_instance_of(klass)
    end
  end
end