# frozen_string_literal: true

require "test_helper"

class TestReplaceKey < Minitest::Test
  def test_it_renames_the_key
    hash = {key_1: 1, key_2: 2}
    new_hash = hash.rename_key(:key_1, :key_one)

    refute_same(hash, new_hash)
    assert_equal({key_1: 1, key_2: 2}, hash)
    assert_equal({key_one: 1, key_2: 2}, new_hash)
  end

  def test_it_renames_the_key_in_memory
    hash = {key_1: 1, key_2: 2}
    modified_hash = hash.rename_key!(:key_1, :key_one)

    assert_same(hash, modified_hash)
    assert_equal({key_one: 1, key_2: 2}, hash)
  end

  def test_it_can_change_the_type
    hash = {key_1: 1, key_2: 2}
    assert_equal({"key_one" => 1, :key_2 => 2}, hash.rename_key(:key_1, "key_one"))

    hash.rename_key!(:key_1, "key_one")
    assert_equal({"key_one" => 1, :key_2 => 2}, hash)
  end

  def test_it_does_not_add_non_existent_key
    hash = {baz: true}

    result = hash.rename_key(:foo, :bar)
    assert_equal({baz: true}, result)

    hash.rename_key!(:foo, :bar)
    assert_equal({baz: true}, hash)
  end
end