chromium/testing/multiprocess_func_list.h

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef TESTING_MULTIPROCESS_FUNC_LIST_H_
#define TESTING_MULTIPROCESS_FUNC_LIST_H_

#include <string>

// This file provides the plumbing to register functions to be executed
// as the main function of a child process in a multi-process test.
// This complements the MultiProcessTest class which provides facilities
// for launching such tests.
//
// The MULTIPROCESS_TEST_MAIN() macro registers a string -> func_ptr mapping
// by creating a new global instance of the AppendMultiProcessTest() class
// this means that by the time that we reach our main() function the mapping
// is already in place.
//
// Example usage:
//  MULTIPROCESS_TEST_MAIN(a_test_func) {
//    // Code here runs in a child process.
//    return 0;
//  }
//
// The prototype of a_test_func is implicitly
//   int test_main_func_name();

namespace multi_process_function_list {

// Type for child process main functions.
TestMainFunctionPtr;

// Type for child setup functions.
SetupFunctionPtr;

// Helper class to append a test function to the global mapping.
// Used by the MULTIPROCESS_TEST_MAIN macro.
class AppendMultiProcessTest { … };

ChildProcessTestRunner;
void SetChildProcessTestRunner(ChildProcessTestRunner runner);

// Invokes the ChildProcessTestRunner callback with `test_name` if the callback
// is not null. Otherwise invokes test associated main function previously
// registered with MULTIPROCESS_TEST_MAIN().
int InvokeChildProcessTest(const std::string& test_name);

// Invokes a the main function of a test previously registered with
// MULTIPROCESS_TEST_MAIN().
int InvokeChildProcessTestMain(const std::string& test_name);

// This macro creates a global MultiProcessTest::AppendMultiProcessTest object
// whose constructor does the work of adding the global mapping.
#define MULTIPROCESS_TEST_MAIN(test_main) …

// Same as above but lets callers specify a setup method that is run in the
// child process, just before the main function is run.  This facilitates
// adding a generic one-time setup function for multiple tests.
#define MULTIPROCESS_TEST_MAIN_WITH_SETUP(test_main, test_setup) …

}  // namespace multi_process_function_list

#endif  // TESTING_MULTIPROCESS_FUNC_LIST_H_