[ServiceWorker] Tests for Cache

LayoutTests/http/tests/serviceworker/resources/worker-test-harness.js

 /*
  * worker-test-harness should be considered a temporary polyfill around
  * testharness.js for supporting Service Worker based tests. It should not be
  * necessary once the test harness is able to drive worker based tests natively.
  * See https://github.com/w3c/testharness.js/pull/82 for status of effort to
  * update upstream testharness.js. Once the upstreaming is complete, tests that
  * reference worker-test-harness should be updated to directly import
  * testharness.js.
  */
 
@@ skipping 92 matching lines @@
   return promise.then(
     function() {
       throw 'assert_promise_rejects: ' + description + ' Promise did not throw.';
     },
     function(e) {
       if (code !== undefined) {
         assert_throws(code, function() { throw e; }, description);
       }
     });
 }
+
+(function() {
+  var next_cache_index = 1;
+
+  // Returns a promise that resolves to a newly created Cache object. The
+  // returned Cache will be destroyed when |test| completes.
+  function create_temporary_cache(test, base_name) {
+    var uniquifier = base_name || String(++next_cache_index);
+    var cache_name = self.location.pathname + '/' + uniquifier;
+
+    test.add_cleanup(function() {
+        self.caches.delete(cache_name);
+      });
+
+    return self.caches.delete(cache_name)
+      .then(function() {
+          return self.caches.create(cache_name);
+        });
+  }
+
+  self.create_temporary_cache = create_temporary_cache;
+})();