Ruby TypeError：没有将字符串隐式转换为数组

Question

我有一个测试TypeError: no impliciit conversion of String into Array，当它命中我的代码的特定部分时返回。如果我在rspec之外运行代码，则它运行得很好，所以我不确定为什么会这样。

require 'spec_helper'
require 'digital_ocean_size_list'

describe Chef::Knife::DigitalOceanSizeList do
  subject { Chef::Knife::DigitalOceanSizeList.new }

  let(:access_token) { 'FAKE_ACCESS_TOKEN' }

  before :each do
    Chef::Knife::DigitalOceanSizeList.load_deps
    Chef::Config['knife']['digital_ocean_access_token'] = access_token
    allow(subject).to receive(:puts)
  end

  describe "#run" do
    it "should validate the Digital Ocean config keys exist" do
      expect(subject).to receive(:validate!)
      subject.run
    end
....

正在测试以下代码

require 'chef/knife/digital_ocean_base'

class Chef
  class Knife
    class DigitalOceanSizeList < Knife
      include Knife::DigitalOceanBase

      banner 'knife digital_ocean size list (options)'

      def run
        $stdout.sync = true

        validate!

        size_list = [
          ui.color('Slug',   :bold)
        ]

        client.sizes.all.each do |size|
          size_list << size.slug.to_s
        end

        puts ui.list(size_list, :uneven_columns_across, 1)
      end
    end
  end
end

类型错误来自client.sizes.all.each。代码运行良好，只有来自rspec的类型错误。

Answer 1

更改

size_list << size.slug.to_s

至

size_list << [size.slug.to_s]

在我的情况下，发生错误是因为我输入数组中的值不具有[]，所以我将其包装起来[]就可以了。