Method Run

library/cpp/testing/unittest/utmain.cpp:525–577

    }

    void Run(std::function<void()> f, const TString& suite, const char* name, const bool forceFork) override {
        if (!(GetForkTests() || forceFork) || GetIsForked()) {
            return f();
        }

        TList<TString> args(1, "--is-forked-internal");
        args.push_back(Sprintf("+%s::%s", suite.data(), name));

        // stdin is ignored - unittest should not need them...
        TShellCommandOptions options;
        options
            .SetUseShell(false)
            .SetCloseAllFdsOnExec(true)
            .SetAsync(false)
            .SetLatency(1);

        TShellCommand cmd(AppName, args, options);
        cmd.Run();

        const TString& err = cmd.GetError();
        const size_t msgIndex = err.find(ForkCorrectExitMsg);

        // everything is printed by parent process except test's result output ("good" or "fail")
        // which is printed by child. If there was no output - parent process prints default message.
        ForkExitedCorrectly = msgIndex != TString::npos;

        // TODO: stderr output is always printed after stdout
        Cout.Write(cmd.GetOutput());
        Cerr.Write(err.c_str(), Min(msgIndex, err.size()));

        // do not use default case, so gcc will warn if new element in enum will be added
        switch (cmd.GetStatus()) {
            case TShellCommand::SHELL_FINISHED: {
                // test could fail with zero status if it calls exit(0) in the middle.
                if (ForkExitedCorrectly)
                    break;
                [[fallthrough]];
            }
            case TShellCommand::SHELL_ERROR: {
                ythrow yexception() << "Forked test failed";
            }

            case TShellCommand::SHELL_NONE: {
                ythrow yexception() << "Forked test finished with unknown status";
            }
            case TShellCommand::SHELL_RUNNING: {
                Y_ABORT_UNLESS(false, "This can't happen, we used sync mode, it's a bug!");
            }
            case TShellCommand::SHELL_INTERNAL_ERROR: {
                ythrow yexception() << "Forked test failed with internal error: " << cmd.GetInternalError();
            }
        }
    }

private:
    bool PrintBeforeSuite_;