chrome.bluetoothLowEnergy: Implement readDescriptorValue.

chrome/test/data/extensions/api_test/bluetooth_low_energy/read_descriptor_value/runtest.js

Index: chrome/test/data/extensions/api_test/bluetooth_low_energy/read_descriptor_value/runtest.js
diff --git a/chrome/test/data/extensions/api_test/bluetooth_low_energy/read_descriptor_value/runtest.js b/chrome/test/data/extensions/api_test/bluetooth_low_energy/read_descriptor_value/runtest.js
new file mode 100644
index 0000000000000000000000000000000000000000..e7693a96ae9fdf73eba67784d0d48c62f885a8fd
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/bluetooth_low_energy/read_descriptor_value/runtest.js
@@ -0,0 +1,43 @@
+// Copyright 2014 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.
+
+function testReadDescriptorValue() {
+  chrome.test.assertTrue(descriptor != null, '\'descriptor\' is null');
+  chrome.test.assertEq(descId, descriptor.instanceId);
+
+  chrome.test.succeed();
+}
+
+var readDescriptorValue = chrome.bluetoothLowEnergy.readDescriptorValue;
+var descId = 'desc_id0';
+var badDescId = 'desc_id1';
+
+var descriptor = null;
+
+// 1. Unknown descriptor instanceId.
+readDescriptorValue(badDescId, function (result) {
+  if (result || !chrome.runtime.lastError) {
+    chrome.test.fail('\'badDescId\' did not cause failure');
+  }
+
+  // 2. Known descriptor instanceId, but call failure.
+  readDescriptorValue(descId, function (result) {
+    if (result || !chrome.runtime.lastError) {
+      chrome.test.fail('readDescriptorValue should have failed');
+    }
+
+    // 3. Call should succeed.
+    readDescriptorValue(descId, function (result) {
+      if (chrome.runtime.lastError) {
+        chrome.test.fail(chrome.runtime.lastError.message);
+      }
+
+      descriptor = result;
+
+      chrome.test.sendMessage('ready', function (message) {
+        chrome.test.runTests([testReadDescriptorValue]);
+      });
+    });
+  });
+});