Easy serviceworker testing config. To run:

    yarn sw -- http://caltrainschedule.io --output=json

.eslintignore

@@ -21,3 +21,4 @@ lighthouse-cli/types/*.js
 # Handlebar-templates
 lighthouse-core/report/templates/report-templates.js
 lighthouse-core/report/partials/templates/report-partials.js
+lighthouse-core/formatters/partials/templates/report-partials.js

lighthouse-core/audits/service-worker.js

@@ -20,6 +20,8 @@
 const URL = require('../lib/url-shim');
 const Audit = require('./audit');
 
+const Formatter = require('../report/formatter');
+
 /**
  * @param {!Array<!ServiceWorkerVersion>} versions
  * @param {string} url
@@ -56,8 +58,13 @@ class ServiceWorker extends Audit {
     const version = getActivatedServiceWorker(
         artifacts.ServiceWorker.versions, artifacts.URL.finalUrl);
 
+
     return {
-      rawValue: !!version
+      rawValue: !!version,
+      extendedInfo: {
+        formatter: Formatter.SUPPORTED_FORMATS.NULL,
+        value: artifacts.ServiceWorker.versions
+      }
     };
   }
 }

lighthouse-core/config/sw.json

@@ -0,0 +1,44 @@
+{
+  "passes": [{
+    "passName": "defaultPass",
+    "recordNetwork": true,
+    "useThrottling": false,
+    "gatherers": [
+      "url"
+    ]
+  },
+  {
+    "passName": "offlinePass",
+    "recordNetwork": true,
+    "useThrottling": false,
+    "gatherers": [
+      "service-worker",
+      "offline"
+    ]
+  }
+  ],
+
+  "audits": [
+    "service-worker",
+    "works-offline"
+  ],
+
+  "aggregations": [{
+    "name": "Service Worker State",
+    "description": "",
+    "scored": false,
+    "categorizable": false,
+    "items": [{
+      "audits": {
+        "service-worker": {
+          "expectedValue": true,
+          "weight": 1
+        },
+        "works-offline": {
+          "expectedValue": true,
+          "weight": 1
+        }
+      }
+    }]
+  }]
+}

package.json

@@ -33,6 +33,7 @@
     "watch": "bash lighthouse-core/scripts/run-mocha.sh --watch",
     "chrome": "node ./lighthouse-cli/manual-chrome-launcher.js",
     "fast": "npm run start -- --disable-device-emulation --disable-cpu-throttling --disable-network-throttling",
+    "sw": "npm run start -- --disable-cpu-throttling --disable-network-throttling --config-path=./lighthouse-core/config/sw.json",
     "smokehouse": "node lighthouse-cli/test/smokehouse/smokehouse.js",
     "deploy-viewer": "cd lighthouse-viewer && gulp deploy"
   },