Force creation of application listening socket

mojo/shell/incoming_connection_listener_unittest.cc

Index: mojo/shell/incoming_connection_listener_unittest.cc
diff --git a/mojo/shell/incoming_connection_listener_unittest.cc b/mojo/shell/incoming_connection_listener_unittest.cc
index c8b660a3ad627259344eb3e7d004c07139119db8..64f3622e6923a8bf0d9e2b8cd4b4c0a38544e14e 100644
--- a/mojo/shell/incoming_connection_listener_unittest.cc
+++ b/mojo/shell/incoming_connection_listener_unittest.cc
@@ -99,15 +99,40 @@ TEST_F(IncomingConnectionListenerTest, ConnectSuccess) {
   run_loop_.Run();
 }
 
-TEST_F(IncomingConnectionListenerTest, ConnectFails_SocketFileExists) {
+TEST_F(IncomingConnectionListenerTest, ConnectSuccess_SocketFileExists) {
+  TestDelegate delegate;
+  IncomingConnectionListenerPosix listener(socket_path_, &delegate);
+
+  ASSERT_EQ(1, base::WriteFile(socket_path_, "1", 1));
+  ASSERT_TRUE(base::PathExists(socket_path_));
+  listener.StartListening();
+
+  ExternalApplicationRegistrarConnection connection(socket_path_);
+  connection.Connect(base::Bind(&OnConnect, run_loop_.QuitClosure()));
+
+  run_loop_.Run();
+}
+
+TEST_F(IncomingConnectionListenerTest, ConnectFails_SocketFileUndeletable) {
   ListeningFailsDelegate fail_delegate(net::ERR_FILE_EXISTS);
   IncomingConnectionListenerPosix listener(socket_path_, &fail_delegate);
 
+  // Create the socket file.
   ASSERT_EQ(1, base::WriteFile(socket_path_, "1", 1));
   ASSERT_TRUE(base::PathExists(socket_path_));
 
+  // Render it undeletable, but in a way that the test harness can recover
+  // later.
+  int temp_dir_perms = 0;
+  ASSERT_TRUE(base::GetPosixFilePermissions(temp_dir_.path(), &temp_dir_perms));
+  ASSERT_TRUE(
+      base::SetPosixFilePermissions(temp_dir_.path(),
+                                    base::FILE_PERMISSION_READ_BY_USER |
+                                        base::FILE_PERMISSION_WRITE_BY_USER));
   // The listener should fail to start up.
   listener.StartListening();
+
+  ASSERT_TRUE(base::SetPosixFilePermissions(temp_dir_.path(), temp_dir_perms));
 }
 
 TEST_F(IncomingConnectionListenerTest, ConnectFails_SocketDirNonexistent) {