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我正在尝试在命令行中使用聚合物 CLI 运行测试$ polymer test，但出现此错误：

TypeError: Cannot read property 'match' of undefined

error:  cli runtime exception: TypeError: Cannot read property 'match' of undefined
error:  TypeError: Cannot read property 'match' of undefined
    at firefox (/usr/local/lib/node_modules/polymer-cli/node_modules/wct-local/lib/browsers.js:126:46)
    at Object.<anonymous> (/usr/local/lib/node_modules/polymer-cli/node_modules/wct-local/lib/browsers.js:88:38)
    at Generator.next (<anonymous>)
    at fulfilled (/usr/local/lib/node_modules/polymer-cli/node_modules/wct-local/lib/browsers.js:4:58)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:160:7)

我曾尝试关注有关组件测试的官方文档，但恐怕他们对此只字未提。

关于浏览器上的测试，例如运行$ polymer serve并转到我的测试文件夹 url localhost:8081/components/my-component/test，没关系，我可以看到我所有的测试都运行良好。

我尝试使用 运行$ polymer test -l chrome，并且还搜索了类似的问题和问题，但我找不到该问题的任何解决方案。

信息：我正在使用聚合物 3，如在我的依赖项中：

"dependencies": {
    "@polymer/font-roboto": "^3.0.2",
    "@polymer/iron-icons": "^3.0.1",
    "@polymer/paper-item": "^3.0.1",
    "@polymer/paper-listbox": "^3.0.1",
    "@polymer/paper-slider": "^3.0.1",
    "@polymer/paper-spinner": "^3.0.1",
    "@polymer/polymer": "^3.1.0",
    "@vaadin/vaadin-context-menu": "^4.2.0"
  },
  "devDependencies": {
    "@polymer/iron-demo-helpers": "^3.0.0-pre.19",
    "@polymer/test-fixture": "^4.0.2",
    "@webcomponents/webcomponentsjs": "^2.2.0",
    "chai": "^4.2.0",
    "mocha": "^5.2.0",
    "sinon": "^7.2.2",
    "wct-mocha": "^1.0.0"
  }
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