Ruby on rails ActionMailer测试参数错误：参数数目错误（0表示1）

无法理解为什么

bundle exec rake test

命令失败，但当我手动尝试发送电子邮件时，它会正常工作并显示

错误消息： ArgumentError:参数数目错误（0代表1）并突出显示

def stock\u alert\u电子邮件（stock）

from

user\u mailer.rb

def stock_alert_email(stock)
    @stock = stock
    mail(to: 'email@email.org', subject: "Stock Alert! %s has reached %s" % [@stock[0].to_s, @stock[1].to_s])
end

test "stock_alert_email" do
  email = UserMailer.stock_alert_email().deliver_now
  assert_not ActionMailer::Base.deliveries.empty?

  # Test the body of the sent email contains what we expect it to
  assert_equal ['email@email.org'], email.from
  assert_equal ['email@email.org'], email.to
  assert_equal "Stock Alert! %s has reached %s" % [@stock[0].to_s, @stock[1].to_s], email.subject
  assert_equal read_fixture('stock_alert_email').join, email.body.to_s
end

user\u mailer.rb

def stock_alert_email(stock)
    @stock = stock
    mail(to: 'email@email.org', subject: "Stock Alert! %s has reached %s" % [@stock[0].to_s, @stock[1].to_s])
end

test "stock_alert_email" do
  email = UserMailer.stock_alert_email().deliver_now
  assert_not ActionMailer::Base.deliveries.empty?

  # Test the body of the sent email contains what we expect it to
  assert_equal ['email@email.org'], email.from
  assert_equal ['email@email.org'], email.to
  assert_equal "Stock Alert! %s has reached %s" % [@stock[0].to_s, @stock[1].to_s], email.subject
  assert_equal read_fixture('stock_alert_email').join, email.body.to_s
end

user\u mailer\u test.rb

def stock_alert_email(stock)
    @stock = stock
    mail(to: 'email@email.org', subject: "Stock Alert! %s has reached %s" % [@stock[0].to_s, @stock[1].to_s])
end

test "stock_alert_email" do
  email = UserMailer.stock_alert_email().deliver_now
  assert_not ActionMailer::Base.deliveries.empty?

  # Test the body of the sent email contains what we expect it to
  assert_equal ['email@email.org'], email.from
  assert_equal ['email@email.org'], email.to
  assert_equal "Stock Alert! %s has reached %s" % [@stock[0].to_s, @stock[1].to_s], email.subject
  assert_equal read_fixture('stock_alert_email').join, email.body.to_s
end

我呼叫邮件发送的地方

UserMailer.stock_alert_email(@stock).deliver_now

当我在上面的^^行之前使用binding.pry时，我看到@stock是

[1] pry(main)> @stock
=> ["AAPL", 114.21]

---

问题就在这一行

email = UserMailer.stock_alert_email().deliver_now

您没有将任何参数传递给

股票警报\u电子邮件

，而它需要一个参数