Test for --nacl-gdb functionality.

chrome/browser/nacl_host/test/nacl_gdb_browsertest.cc

+// Copyright (c) 2012 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.
+
+#include "base/command_line.h"
+#include "base/file_util.h"
+#include "base/path_service.h"
+#include "chrome/browser/nacl_host/test/mock_nacl_gdb.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/test/ui/ppapi_uitest.h"
+
+static const FilePath::CharType kMockNaClGdb[] =
+#if defined(OS_WIN)
+    FILE_PATH_LITERAL("mock_nacl_gdb.exe");
+#else
+    FILE_PATH_LITERAL("mock_nacl_gdb");
+#endif
+
+class NaClGdbTest : public PPAPINaClTest {
+ public:
+  NaClGdbTest() {
+  }
+
+  void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
+    PPAPINaClTest::SetUpCommandLine(command_line);
+
+    FilePath mock_nacl_gdb;
+    EXPECT_TRUE(PathService::Get(base::DIR_EXE, &mock_nacl_gdb));
+    mock_nacl_gdb = mock_nacl_gdb.Append(kMockNaClGdb);
+    command_line->AppendSwitchPath(switches::kNaClGdb, mock_nacl_gdb);
+  }
+};
+
+IN_PROC_BROWSER_TEST_F(NaClGdbTest, Empty) {
+  FilePath mock_nacl_gdb_file;
+  EXPECT_TRUE(PathService::Get(base::DIR_EXE, &mock_nacl_gdb_file));
+  mock_nacl_gdb_file = mock_nacl_gdb_file.Append(kMockNaClGdbFile);
+  file_util::Delete(mock_nacl_gdb_file, false);
+  RunTestViaHTTP("Empty");
+  EXPECT_TRUE(file_util::PathExists(mock_nacl_gdb_file));

[Mark Seaborn, 2012/03/14 23:33:14]

This file seems to be going into the current directory, which is presumably the
Chromium source dir.  I don't like that.

How about this:
 * Create an empty temp file (using an interface in 'base').
 * Set an env var with the temp file's pathname.
 * Have the mock gdb write a string to the temp file.
 * Assert that the temp file contains the string.
 * Delete the file; unset the env var.

[halyavin, 2012/03/15 15:31:36]

No, it is src/build/Debug directory (src/out/Debug or linux). It doesn't have
any source files. All executables and test files like (test.html) go there.

+  EXPECT_TRUE(file_util::Delete(mock_nacl_gdb_file, false));
+}