[ServiceWorker] CacheStorage tests.

LayoutTests/http/tests/serviceworker/resources/cache-storage-test-worker.js

+importScripts('worker-test-harness.js');
+
+promise_test(function(test) {
+    return caches.create('foo')
+      .then(test.step_func(function(cache) {
+          assert_true(cache,
+                      'CacheStorage.create should return a valid Cache.');
+          assert_true(cache instanceof Cache,
+                      'CacheStorage.create should return a valid Cache.');
+        }));
+  }, 'CacheStorage.create');
+
+promise_test(function(test) {
+    return caches.create()
+      // FIXME: Define the behavior for .create() with an empty or
+      // non-string cache name.
+      .then(test.unreached_func('CacheStorage.create should reject ' +

[jsbell, 2014/08/01 00:09:11]

You may be able to avoid splitting the string in some cases by wrapping after
the (

[asanka, 2014/08/01 06:03:21]

Done.

+                                'invalid name.'),
+            function() {});
+  }, 'CacheStorage.create with invalid cache name');
+
+promise_test(function(test) {
+    return caches.create('bar')
+      .then(test.step_func(function() { return caches.has('bar'); }))
+      .then(test.step_func(function(result) {
+          assert_true(result,
+                      'CacheStorage.has should return true for ' +
+                      'existing cache');
+        }));
+  }, 'CacheStorage.has with existing cache');
+
+promise_test(function(test) {
+    return caches.has('cheezburger')
+      .then(test.step_func(function(result) {
+          assert_false(result,
+                       'CacheStorage.has should return false for ' +
+                       'non-existent cache');
+        }));
+  }, 'CacheStorage.has with non-existent cache');
+
+promise_test(function(test) {
+    return caches.has()
+      // FIXME: Define the behavior for .has() with an invalid or undefined
+      // name.  Perhaps it should reject instead of returning false.
+      .then(test.step_func(function(result) {
+          // FIXME: Could fail due to the cache creation with an undefined name
+          // above. Tests shouldn't interact since these are all async_tests.
+          assert_false(result,
+                       'CacheStorage.has should return false for invalid ' +
+                       'cache name.');
+        }));
+  }, 'CacheStorage.has with invalid cache name');
+
+promise_test(function(test) {
+    var cache_name = 'to-be-deleted';
+
+    return caches.create(cache_name)
+      .then(function() { return caches.delete(cache_name); })
+      .then(function() {},
+            test.unreached_func('CacheStorage.delete should not reject ' +
+                                'existing cache'))
+
+      .then(function() { return caches.has(cache_name); })
+      .then(test.step_func(function(cache_exists) {
+          assert_false(
+                       cache_exists,
+                       'CacheStorage.has should not return true after ' +
+                       'fulfilment of CacheStorage.delete promise');
+        }));
+  }, 'CacheStorage.delete with existing cache');
+
+promise_test(function(test) {
+    return caches.delete('cheezburger')
+      .then(test.unreached_func('CacheStorage.delete should not fulfil ' +
+                                'promise to delete non-existent cache.'),
+            function() {});
+  }, 'CacheStorage.delete with non-existent cache');
+
+// FIXME: Define and test behavior for invalid cache name with delete().