chore: import upstream snapshot with attribution

test/multiprocess_func_list.h

@@ -0,0 +1,70 @@
+// 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.
+
+#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.
+typedef int (*TestMainFunctionPtr)();
+
+// Type for child setup functions.
+typedef void (*SetupFunctionPtr)();
+
+// Helper class to append a test function to the global mapping.
+// Used by the MULTIPROCESS_TEST_MAIN macro.
+class AppendMultiProcessTest {
+ public:
+  // |main_func_ptr| is the main function that is run in the child process.
+  // |setup_func_ptr| is a function run when the global mapping is added.
+  AppendMultiProcessTest(std::string test_name,
+                         TestMainFunctionPtr main_func_ptr,
+                         SetupFunctionPtr setup_func_ptr);
+};
+
+// Invoke the main function of a test previously registered with
+// MULTIPROCESS_TEST_MAIN()
+int InvokeChildProcessTest(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) \
+  MULTIPROCESS_TEST_MAIN_WITH_SETUP(test_main, NULL)
+
+// 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) \
+  int test_main(); \
+  namespace { \
+    multi_process_function_list::AppendMultiProcessTest \
+    AddMultiProcessTest##_##test_main(#test_main, (test_main), (test_setup)); \
+  } \
+  int test_main()
+
+}  // namespace multi_process_function_list
+
+#endif  // TESTING_MULTIPROCESS_FUNC_LIST_H_