Files.app: Add Model class that is the set of MetadataCacheItem.

ui/file_manager/file_manager/foreground/js/metadata/metadata_cache_set_unittest.js

Index: ui/file_manager/file_manager/foreground/js/metadata/metadata_cache_set_unittest.js
diff --git a/ui/file_manager/file_manager/foreground/js/metadata/metadata_cache_set_unittest.js b/ui/file_manager/file_manager/foreground/js/metadata/metadata_cache_set_unittest.js
new file mode 100644
index 0000000000000000000000000000000000000000..9f3f37f9b318ff013b430987301703070859807d
--- /dev/null
+++ b/ui/file_manager/file_manager/foreground/js/metadata/metadata_cache_set_unittest.js
@@ -0,0 +1,83 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var entryA = {
+  toURL: function() { return "filesystem://A"; }
+};
+
+var entryB = {
+  toURL: function() { return "filesystem://B"; }
+};
+
+function testMetadataCacheSetBasic() {
+  var set = new MetadataCacheSet(new MetadataCacheSetStorageForObject({}));
+  var loadRequested = set.startRequests(1, [entryA, entryB], ['property']);
+  assertEquals(2, loadRequested.length);
+  assertEquals(entryA, loadRequested[0].entry);
+  assertEquals(1, loadRequested[0].names.length);
+  assertEquals('property', loadRequested[0].names[0]);
+  assertEquals(entryB, loadRequested[1].entry);
+  assertEquals(1, loadRequested[1].names.length);
+  assertEquals('property', loadRequested[1].names[0]);
+
+  assertTrue(set.storeProperties(
+      1, [entryA, entryB], [{property: 'valueA'}, {property: 'valueB'}]));
+
+  var results = set.get([entryA, entryB], ['property']);
+  assertEquals(2, results.length);
+  assertEquals('valueA', results[0].property);
+  assertEquals('valueB', results[1].property);
+}
+
+function testMetadataCacheSetStorePartial() {
+  var set = new MetadataCacheSet(new MetadataCacheSetStorageForObject({}));
+  set.startRequests(1, [entryA, entryB], ['property']);
+
+  assertTrue(set.storeProperties(
+      1, [entryA], [{property: 'valueA'}]));
+  var results = set.get([entryA, entryB], ['property']);
+  assertEquals(2, results.length);
+  assertEquals('valueA', results[0].property);
+  assertEquals(null, results[1].property);
+
+  assertTrue(set.storeProperties(
+      1, [entryB], [{property: 'valueB'}]));
+  var results = set.get([entryA, entryB], ['property']);
+  assertEquals(2, results.length);
+  assertEquals('valueA', results[0].property);
+  assertEquals('valueB', results[1].property);
+}
+
+function testMetadataCacheSetCachePartial() {
+  var set = new MetadataCacheSet(new MetadataCacheSetStorageForObject({}));
+  set.startRequests(1, [entryA], ['property']);
+  set.storeProperties(1, [entryA], [{property: 'valueA'}]);
+
+  // entryA has already been cached.
+  var loadRequested = set.startRequests(2, [entryA, entryB], ['property']);
+  assertEquals(1, loadRequested.length);
+  assertEquals(entryB, loadRequested[0].entry);
+  assertEquals(1, loadRequested[0].names.length);
+  assertEquals('property', loadRequested[0].names[0]);
+}
+
+function testMetadataCacheSetInvalidatePartial() {
+  var set = new MetadataCacheSet(new MetadataCacheSetStorageForObject({}));
+  set.startRequests(1, [entryA, entryB], ['property']);
+  set.invalidate(2, [entryA]);
+
+  assertTrue(set.storeProperties(
+      1, [entryA, entryB], [{property: 'valueA'}, {property: 'valueB'}]));
+
+  var results = set.get([entryA, entryB], ['property']);
+  assertEquals(2, results.length);
+  assertEquals(null, results[0].property);
+  assertEquals('valueB', results[1].property);
+
+  var loadRequested = set.startRequests(3, [entryA, entryB], ['property']);
+  assertEquals(1, loadRequested.length);
+  assertEquals(entryA, loadRequested[0].entry);
+  assertEquals(1, loadRequested[0].names.length);
+  assertEquals('property', loadRequested[0].names[0]);
+}