Add kSmsTestMessages switch to sms handler unititest

chromeos/network/network_sms_handler_unittest.cc

Index: chromeos/network/network_sms_handler_unittest.cc
diff --git a/chromeos/network/network_sms_handler_unittest.cc b/chromeos/network/network_sms_handler_unittest.cc
index 0e5fd2400665ea2a96b2efd1a1850e6037ba8247..f3b72ff37bcd7e6a279b717d36835b2c4adcbfbc 100644
--- a/chromeos/network/network_sms_handler_unittest.cc
+++ b/chromeos/network/network_sms_handler_unittest.cc
@@ -7,8 +7,10 @@
 #include <set>
 #include <string>
 
+#include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
+#include "chromeos/chromeos_switches.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -63,6 +65,11 @@ class NetworkSmsHandlerTest : public testing::Test {
 };
 
 TEST_F(NetworkSmsHandlerTest, SmsHandlerDbusStub) {
+  // Append '--sms-test-messages' to the command line to tell SMSClientStubImpl
+  // to generate a series of test SMS messages.
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  command_line->AppendSwitch(chromeos::switches::kSmsTestMessages);
+
   // This relies on the stub dbus implementations for FlimflamManagerClient,
   // FlimflamDeviceClient, GsmSMSClient, ModemMessagingClient and SMSClient.
   // Initialize a sms handler. The stub dbus clients will not send the