Add SystemMonitor::GetMediaDevices()

base/system_monitor/system_monitor_unittest.cc

Index: base/system_monitor/system_monitor_unittest.cc
===================================================================
--- base/system_monitor/system_monitor_unittest.cc	(revision 137731)
+++ base/system_monitor/system_monitor_unittest.cc	(working copy)
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "base/file_path.h"
+#include "base/message_loop.h"
 #include "base/test/mock_devices_changed_observer.h"
 #include "base/system_monitor/system_monitor.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ -137,4 +138,72 @@
   loop.RunAllPending();
 }
 
+TEST(SystemMonitor, GetMediaDevicesEmpty) {
+  // Initialize a message loop for this to run on.
+  MessageLoop loop;
+
+#if defined(OS_MACOSX)
+  SystemMonitor::AllocateSystemIOPorts();
+#endif
+
+  SystemMonitor system_monitor;
+
+  std::vector<SystemMonitor::MediaDeviceInfo> devices;
+  system_monitor.GetMediaDevices(&devices);
+  EXPECT_EQ(0U, devices.size());
+}
+
+TEST(SystemMonitor, GetMediaDevicesAttachDetach) {
+  // Initialize a message loop for this to run on.
+  MessageLoop loop;
+
+#if defined(OS_MACOSX)
+  SystemMonitor::AllocateSystemIOPorts();
+#endif
+
+  SystemMonitor system_monitor;
+
+  const SystemMonitor::DeviceIdType kDeviceId1 = 42;
+  const char kDeviceName1[] = "test";
+  const FilePath kDevicePath1(FILE_PATH_LITERAL("/testfoo"));
+  system_monitor.ProcessMediaDeviceAttached(kDeviceId1,
+                                            kDeviceName1,
+                                            kDevicePath1);
+  loop.RunAllPending();
+  std::vector<SystemMonitor::MediaDeviceInfo> devices;
+  system_monitor.GetMediaDevices(&devices);
+  ASSERT_EQ(1U, devices.size());
+  EXPECT_EQ(kDeviceName1, devices[0].first);
+  EXPECT_EQ(kDevicePath1, devices[0].second);
+
+  const SystemMonitor::DeviceIdType kDeviceId2 = 44;
+  const char kDeviceName2[] = "test2";
+  const FilePath kDevicePath2(FILE_PATH_LITERAL("/testbar"));
+  system_monitor.ProcessMediaDeviceAttached(kDeviceId2,
+                                            kDeviceName2,
+                                            kDevicePath2);
+  loop.RunAllPending();
+  devices.clear();
+  system_monitor.GetMediaDevices(&devices);
+  ASSERT_EQ(2U, devices.size());
+  EXPECT_EQ(kDeviceName1, devices[0].first);
+  EXPECT_EQ(kDevicePath1, devices[0].second);
+  EXPECT_EQ(kDeviceName2, devices[1].first);
+  EXPECT_EQ(kDevicePath2, devices[1].second);
+
+  system_monitor.ProcessMediaDeviceDetached(kDeviceId1);
+  loop.RunAllPending();
+  devices.clear();
+  system_monitor.GetMediaDevices(&devices);
+  ASSERT_EQ(1U, devices.size());
+  EXPECT_EQ(kDeviceName2, devices[1].first);
+  EXPECT_EQ(kDevicePath2, devices[1].second);
+
+  system_monitor.ProcessMediaDeviceDetached(kDeviceId2);
+  loop.RunAllPending();
+  devices.clear();
+  system_monitor.GetMediaDevices(&devices);
+  EXPECT_EQ(0U, devices.size());
+}
+
 }  // namespace base