// 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 BASE_TEST_MULTIPROCESS_TEST_H_ #define BASE_TEST_MULTIPROCESS_TEST_H_ #include #include "base/basictypes.h" #include "base/process/launch.h" #include "base/process/process_handle.h" #include "build/build_config.h" #include "testing/platform_test.h" class CommandLine; namespace base { // Helpers to spawn a child for a multiprocess test and execute a designated // function. Use these when you already have another base class for your test // fixture, but you want (some) of your tests to be multiprocess (otherwise you // may just want to derive your fixture from |MultiProcessTest|, below). // // Use these helpers as follows: // // TEST_F(MyTest, ATest) { // CommandLine command_line( // base::GetMultiProcessTestChildBaseCommandLine()); // // Maybe add our own switches to |command_line|.... // // LaunchOptions options; // // Maybe set some options (e.g., |start_hidden| on Windows).... // // // Start a child process and run |a_test_func|. // base::ProcessHandle test_child_handle = // base::SpawnMultiProcessTestChild("a_test_func", command_line, // options); // // // Do stuff involving |test_child_handle| and the child process.... // // int rv = -1; // ASSERT_TRUE(base::WaitForExitCodeWithTimeout( // test_child_handle, &rv, TestTimeouts::action_timeout())); // base::CloseProcessHandle(test_child_handle); // EXPECT_EQ(0, rv); // } // // // Note: |MULTIPROCESS_TEST_MAIN()| is defined in // // testing/multi_process_function_list.h. // MULTIPROCESS_TEST_MAIN(a_test_func) { // // Code here runs in a child process.... // return 0; // } // Spawns a child process and executes the function |procname| declared using // |MULTIPROCESS_TEST_MAIN()| or |MULTIPROCESS_TEST_MAIN_WITH_SETUP()|. // |command_line| should be as provided by // |GetMultiProcessTestChildBaseCommandLine()| (below), possibly with arguments // added. Note: On Windows, you probably want to set |options.start_hidden|. ProcessHandle SpawnMultiProcessTestChild( const std::string& procname, const CommandLine& command_line, const LaunchOptions& options); // Gets the base command line for |SpawnMultiProcessTestChild()|. To this, you // may add any flags needed for your child process. CommandLine GetMultiProcessTestChildBaseCommandLine(); // MultiProcessTest ------------------------------------------------------------ // A MultiProcessTest is a test class which makes it easier to // write a test which requires code running out of process. // // To create a multiprocess test simply follow these steps: // // 1) Derive your test from MultiProcessTest. Example: // // class MyTest : public MultiProcessTest { // }; // // TEST_F(MyTest, TestCaseName) { // ... // } // // 2) Create a mainline function for the child processes and include // testing/multiprocess_func_list.h. // See the declaration of the MULTIPROCESS_TEST_MAIN macro // in that file for an example. // 3) Call SpawnChild("foo"), where "foo" is the name of // the function you wish to run in the child processes. // That's it! class MultiProcessTest : public PlatformTest { public: MultiProcessTest(); protected: // Run a child process. // 'procname' is the name of a function which the child will // execute. It must be exported from this library in order to // run. // // Example signature: // extern "C" int __declspec(dllexport) FooBar() { // // do client work here // } // // Returns the handle to the child, or NULL on failure ProcessHandle SpawnChild(const std::string& procname); // Run a child process using the given launch options. // // Note: On Windows, you probably want to set |options.start_hidden|. ProcessHandle SpawnChildWithOptions(const std::string& procname, const LaunchOptions& options); // Set up the command line used to spawn the child process. // Override this to add things to the command line (calling this first in the // override). // Note that currently some tests rely on this providing a full command line, // which they then use directly with |LaunchProcess()|. // TODO(viettrungluu): Remove this and add a virtual // |ModifyChildCommandLine()|; make the two divergent uses more sane. virtual CommandLine MakeCmdLine(const std::string& procname); private: DISALLOW_COPY_AND_ASSIGN(MultiProcessTest); }; } // namespace base #endif // BASE_TEST_MULTIPROCESS_TEST_H_