从测试中获取用户的问题

Question

我正在编写测试帐户激活的测试，但我遇到了一些问题：

  test "valid signup information with account activation" do
    log_in_as(@user)
    get new_company_path
    assert_difference 'Company.count', 1 do
      assert_difference 'User.count', 1 do
        post companies_path, company: { name: "company",
                                        users_attributes: [{
                                          first_name: 'John',
                                          last_name: 'Doe',
                                          email: 'user@example.com',
                                          password: 'foobar' }]
                                      }
      end
    end
    assert_equal 1, ActionMailer::Base.deliveries.size

    user = User.last
    assert_not user.activated?
    # Try to log in before activation.
    log_in_as(user)
    assert_not is_logged_in?
    # Invalid activation token
    get edit_account_activation_path("invalid token")
    assert_not is_logged_in?
    # Valid token, wrong email
    get edit_account_activation_path(user.activation_token, email: 'wrong')
    assert_not is_logged_in?
    # Valid activation token
    get edit_account_activation_path(user.activation_token, email: user.email)
    assert user.reload.activated?
    follow_redirect!
    assert_template '/'
    assert is_logged_in?
  end

问题是我无法检索我在POST中创建的用户。我尝试使用User.last，但似乎不起作用。有没有人知道如何使这项工作？

测试返回

Expected true to be nil or false

在assert_not is_logged_in?

行