尝试安装多窗口功能时Chefspec不工作

我有一个为IIS安装组件的方法。因为有很多,所以它是一个数组 windows_feature 安装块。像这样:

 strings.each do |st|
     windows_feature st do
        guard_interpreter :powershell_script
         not_if "$ret = Get-WindowsOptionalFeature -Online -FeatureName #{st}; if ($ret.State -eq 'Disabled' ) { return 'false'} else {return 'true'}"
         action :install
     end
 end

我关联的Chefspec块中有相同的数组内容提要。块是这样的:

describe 'HEQIIS::IIS' do
     let(:chef_run) { ChefSpec::SoloRunner.converge('HEQIIS::IIS') }
   strings.each do |st|
     it "installs_#{st}" do
       stub_command("$ret = Get-WindowsOptionalFeature -Online -FeatureName #{st}; if ($ret.State -eq 'Disabled' ) { return 'false'} else {return 'true'}").and_return(false)
       expect(chef_run).to install_windows_feature("#{st}")
     end
   end
 end

当我在食谱上运行Chefspec时,我得到错误:

HEQIIS::IIS installs_IIS-LegacyScripts
      Failure/Error: let(:chef_run) { ChefSpec::SoloRunner.converge('HEQIIS::IIS') }

      ChefSpec::Error::CommandNotStubbed:
        Executing a real command is disabled. Unregistered command:

            command("$ret = Get-WindowsOptionalFeature -Online -FeatureName IIS-WebServerRole; if ($ret.State -eq 'Disabled' ) { return 'false'} else {return 'true'}")

        You can stub this command with:

            stub_command("$ret = Get-WindowsOptionalFeature -Online -FeatureName IIS-WebServerRole; if ($ret.State -eq 'Disabled' ) { return 'false'} else {return 'true'}").and_return(...)
      # ./heqiis/spec/default_spec.rb:70:in `block (2 levels) in <top (required)>'
      # ./heqiis/spec/default_spec.rb:75:in `block (3 levels) in <top (required)>'

在错误中,它将-Featurename显示为“WebServerRole”,它对每一行(30个条目)都这样做。这表明它只在该阶段的第一项上迭代。这一点,再加上我肯定在使用stub_command块这一事实,我不太清楚为什么会出错。有人有什么想法吗?