为 rspec 规范添加辅助函数的正确方法

如何为RSpec规范添加辅助函数

ruby
RSpec.describe "Calculator" do
  helper :add do |a, b|
    a + b
  end
  it "should add two numbers" do
    result = add(3, 4)
    expect(result).to eq(7)
  end
end

ruby
RSpec.describe "User" do
  helper :create_user do |name, email|
    User.create(name: name, email: email)
  end
  it "creates a user" do
    user = create_user("Alice", "alice@example.com")
    expect(user).to be_valid
  end
  it "validates user email" do
    user = create_user("Bob", "invalid_email")
    expect(user).to_not be_valid
  end
end

ruby
RSpec.describe "Article" do
  before(:each) do
    @author = create_author("Alice")
  end
  helper :create_author do |name|
    Author.create(name: name)
  end
  it "is associated with an author" do
    article = @author.articles.create(title: "Sample Article")
    expect(article.author).to eq(@author)
  end
end