MediaPerceptionPrivate API impl and testing.

chrome/test/data/extensions/api_test/media_perception_private/state/runtest.js

+// Copyright 2017 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.
+
+let kStatusEnum = 'RUNNING'

[tbarzic, 2017/05/11 00:38:27]

can you just create new state object in tests?

[Luke Sorenson, 2017/05/11 23:57:58]

Done.

+var state = { status: kStatusEnum }
+
+function setState() {
+  state.deviceContext = 'Just a string.';

[tbarzic, 2017/05/11 00:38:27]

can you set this to something little more meaningful?
like: 'device_context'.

[Luke Sorenson, 2017/05/11 23:57:58]

Done.

+  chrome.mediaPerceptionPrivate.setState(
+      state, chrome.test.callbackPass(function(state) {
+        chrome.test.assertEq(state.status, kStatusEnum);
+      }));
+}
+
+function getState() {
+  chrome.mediaPerceptionPrivate.getState(
+      chrome.test.callbackPass(function(state) {
+        chrome.test.assertEq(state.status, kStatusEnum);
+      }));
+}
+
+function setStateUnsettable() {
+  state.status = 'UNINITIALIZED';

[tbarzic, 2017/05/11 00:38:27]

what about other states?

[Luke Sorenson, 2017/05/11 23:57:58]

Done.

+  const error = 'Status can only be set to RUNNING and SUSPENDED.';
+  chrome.mediaPerceptionPrivate.setState(
+      state, chrome.test.callbackFail(error));
+}
+
+function setStateSuspendedButWithDeviceContextFail() {
+  state.status = 'SUSPENDED';
+  state.deviceContext = 'Just a string.';
+  const error = 'Only provide deviceContext with SetState RUNNING.';

[tbarzic, 2017/05/11 00:38:27]

can you test there's an error if the current state is RUNNING?

[Luke Sorenson, 2017/05/11 23:57:58]

That isn't an error case. Setting the desired state to RUNNING when the process
is already RUNNING still returns back state RUNNING.

+  chrome.mediaPerceptionPrivate.setState(
+      state, chrome.test.callbackFail(error));
+}
+
+chrome.test.runTests([
+    setState,
+    getState,
+    setStateUnsettable,
+    setStateSuspendedButWithDeviceContextFail]);
+