no such thing as "fail()" in Deno testing system

__tests__/service-worker/service-worker.test.js

@@ -850,7 +850,7 @@ describe('service-worker', async () => {
                 return true;
             }
         }
-        fail('New config failed to cache, apparently!')
+        throw new Error('New config failed to cache, apparently!')
     })
     
     it("should use a stale cached valid config.json file without a fetch; invalid config.json retrieved using the configured plugins should not be cached", async () => {
@@ -920,7 +920,7 @@ describe('service-worker', async () => {
             // did we get the new config?
             if (await window.waitForCacheAction(config_url) === mock_response_data2.data) {
                 // we did! that's a paddling!
-                fail('New config failed to cache, apparently!')
+                throw new Error('New config failed to cache, apparently!')
             }
         }
     })
@@ -992,7 +992,7 @@ describe('service-worker', async () => {
             // did we get the new config?
             if (await window.waitForCacheAction(config_url) === mock_response_data2.data) {
                 // we did! that's a paddling
-                fail('New config failed to cache, apparently!')
+                throw new Error('New config failed to cache, apparently!')
             }
         }
     })