`method_missing':`build`在示例组中不可用(例如`describe`或`context`块)

Question

我想删除FactoryGirl.build(:user)每次我想创建一个用户,所以我添加了这些行:

RSpec.configure do |config|
  config.include FactoryGirl::Syntax::Methods
end

到了spec_helper.rb.但是这会产生以下错误:

`method_missing': `build` is not available on an example group (e.g. a `describe` or `context` block). It is only available from within individual examples (e.g. `it` blocks) or from constructs that run in the scope of an example (e.g. `before`, `let`, etc). (RSpec::Core::ExampleGroup::WrongScopeError)

然后我删除了所有上下文/描述块,但这并没有改变任何东西.你有没有遇到同样的问题,我该如何解决？

目前我的测试看起来像这样:

require 'rails_helper'

RSpec.describe User, type: :model do
  user = build(:user)
  project = build(:project)

  it "is valid with a firstname, lastname, email and password" do
    expect(user).to be_valid
  end

  it "is invalid without a firstname" do
    user = build(:user, name: nil)

    expect(user.valid?).to be_falsey
    expect(user.errors[:name].size).to eq(1)
  end

  it "is invalid without a lastname" do
    user = build(:user, surname: nil)

    expect(user.valid?).to be_falsey
    expect(user.errors[:surname].size).to eq(1)
  end

  it "destroys dependent projects" do
    user = User.create!(name: 'john', surname: 'doe', email: 't@example.com', password: 'password', password_confirmation: 'password')
    user.projects << project

    expect{user.destroy}.to change {Project.count}.by(-1)
  end

end

Answer 1

代替：

user = build(:user)
project = build(:project)

做：

let(:user) { build(:user) }
let(:project) { build(:project) }

通常，定义外部变量以在测试中使用它们不是一个好主意，因为这可能使您的测试依赖于顺序，并且极难调试。始终使用let语法，因此将为每个测试重新初始化值。